Upstream information

CVE-2026-74577 at MITRE

Description

In the Linux kernel, the following vulnerability has been resolved:

net: mpls: initialize rtm_tos in mpls_getroute()

mpls_getroute() builds the RTM_NEWROUTE reply to an RTM_GETROUTE
request by filling a struct rtmsg allocated from an skb whose data
area is not zeroed (alloc_skb(NLMSG_GOODSIZE, ...)). It sets every
field of the header except rtm_tos:

r = nlmsg_data(nlh);
r->rtm_family = AF_MPLS;
r->rtm_dst_len = 20;
r->rtm_src_len = 0;
r->rtm_table = RT_TABLE_MAIN;
r->rtm_type = RTN_UNICAST;
r->rtm_scope = RT_SCOPE_UNIVERSE;
r->rtm_protocol = rt->rt_protocol;
r->rtm_flags = 0;

struct rtmsg has no padding, so the one uninitialised byte rtm_tos
(offset 3) is copied straight to user space on recvmsg(), leaking a
byte of uninitialised heap memory. This is in contrast to
mpls_dump_route(), which fills the very same header and does set
rtm_tos = 0.

Initialize rtm_tos to 0, matching mpls_dump_route().

Reproduced with KMSAN by adding an MPLS route and issuing a
non-RTM_F_FIB_MATCH RTM_GETROUTE for its label:

BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x36c/0x33f0
_copy_to_iter+0x36c/0x33f0
__skb_datagram_iter+0x196/0x12c0
skb_copy_datagram_iter+0x5b/0x210
netlink_recvmsg+0x37b/0xef0
...
Uninit was created at:
__alloc_skb+0x8ca/0x10e0
mpls_getroute+0x1280/0x3a40
rtnetlink_rcv_msg+0x1138/0x15a0
...
Byte 19 of 64 is uninitialized

(byte 19 = nlmsghdr(16) + rtmsg offset 3 = rtm_tos)

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail SUSE
Base Score 3.3
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact None
Availability Impact None
CVSSv3 Version 3.1

Note from the SUSE Security Team on the kernel-default package

SUSE will no longer fix all CVEs in the Linux Kernel anymore, but declare some bug classes as won't fix. Please refer to TID 21496 for more details.

SUSE Bugzilla entry: 1275572 [NEW]

No SUSE Security Announcements cross referenced.

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise High Availability Extension 15 SP7
  • cluster-md-kmp-default >= 6.4.0-150700.53.81.1
  • dlm-kmp-default >= 6.4.0-150700.53.81.1
  • gfs2-kmp-default >= 6.4.0-150700.53.81.1
  • ocfs2-kmp-default >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Module for Basesystem 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.81.1
  • kernel-64kb-devel >= 6.4.0-150700.53.81.1
  • kernel-default >= 6.4.0-150700.53.81.1
  • kernel-default-base >= 6.4.0-150700.53.81.1.150700.17.45.1
  • kernel-default-devel >= 6.4.0-150700.53.81.1
  • kernel-devel >= 6.4.0-150700.53.81.1
  • kernel-macros >= 6.4.0-150700.53.81.1
  • kernel-zfcpdump >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.81.1
  • kernel-64kb-devel >= 6.4.0-150700.53.81.1
  • kernel-default >= 6.4.0-150700.53.81.1
  • kernel-default-base >= 6.4.0-150700.53.81.1.150700.17.45.1
  • kernel-default-devel >= 6.4.0-150700.53.81.1
  • kernel-devel >= 6.4.0-150700.53.81.1
  • kernel-macros >= 6.4.0-150700.53.81.1
  • kernel-zfcpdump >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.81.1
  • kernel-64kb-devel >= 6.4.0-150700.53.81.1
  • kernel-default >= 6.4.0-150700.53.81.1
  • kernel-default-base >= 6.4.0-150700.53.81.1.150700.17.45.1
  • kernel-default-devel >= 6.4.0-150700.53.81.1
  • kernel-devel >= 6.4.0-150700.53.81.1
  • kernel-macros >= 6.4.0-150700.53.81.1
  • kernel-zfcpdump >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-64kb >= 6.4.0-150700.53.81.1
  • kernel-64kb-devel >= 6.4.0-150700.53.81.1
  • kernel-default >= 6.4.0-150700.53.81.1
  • kernel-default-base >= 6.4.0-150700.53.81.1.150700.17.45.1
  • kernel-default-devel >= 6.4.0-150700.53.81.1
  • kernel-devel >= 6.4.0-150700.53.81.1
  • kernel-macros >= 6.4.0-150700.53.81.1
  • kernel-zfcpdump >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Module for Development Tools 15 SP7
  • kernel-docs >= 6.4.0-150700.53.81.1
  • kernel-obs-build >= 6.4.0-150700.53.81.1
  • kernel-source >= 6.4.0-150700.53.81.1
  • kernel-syms >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-docs >= 6.4.0-150700.53.81.1
  • kernel-obs-build >= 6.4.0-150700.53.81.1
  • kernel-source >= 6.4.0-150700.53.81.1
  • kernel-syms >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-docs >= 6.4.0-150700.53.81.1
  • kernel-obs-build >= 6.4.0-150700.53.81.1
  • kernel-source >= 6.4.0-150700.53.81.1
  • kernel-syms >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-docs >= 6.4.0-150700.53.81.1
  • kernel-obs-build >= 6.4.0-150700.53.81.1
  • kernel-source >= 6.4.0-150700.53.81.1
  • kernel-syms >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Module for Legacy 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • reiserfs-kmp-default >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Module for Public Cloud 15 SP7
  • kernel-azure >= 6.4.0-150700.53.81.1
  • kernel-azure-devel >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-azure >= 6.4.0-150700.53.81.1
  • kernel-azure-devel >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-azure >= 6.4.0-150700.53.81.1
  • kernel-azure-devel >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Workstation Extension 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.81.1
SUSE Linux Enterprise Desktop 15 SP7
  • kernel-default-extra >= 6.4.0-150700.53.81.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-default In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-source In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Desktop 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-default In progress
SUSE Linux Enterprise High Availability Extension 15 SP7 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-default Affected
SUSE Linux Enterprise High Availability Extension 16.0 kernel-source Affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-default Affected
SUSE Linux Enterprise High Availability Extension 16.1 kernel-source Affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-default Affected
SUSE Linux Enterprise Live Patching 15 SP7 kernel-source Affected
SUSE Linux Enterprise Micro 5.3 kernel-default Affected
SUSE Linux Enterprise Micro 5.3 kernel-rt Affected
SUSE Linux Enterprise Micro 5.3 kernel-source Affected
SUSE Linux Enterprise Micro 5.3 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.4 kernel-default Affected
SUSE Linux Enterprise Micro 5.4 kernel-rt Affected
SUSE Linux Enterprise Micro 5.4 kernel-source Affected
SUSE Linux Enterprise Micro 5.4 kernel-source-rt Affected
SUSE Linux Enterprise Micro 5.5 kernel-default Affected
SUSE Linux Enterprise Micro 5.5 kernel-source Affected
SUSE Linux Enterprise Micro 5.5 kernel-source-rt Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-source In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-default Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-source In progress
SUSE Linux Enterprise Module for Development Tools 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-default In progress
SUSE Linux Enterprise Module for Legacy 15 SP7 kernel-source Affected
SUSE Linux Enterprise Module for Public Cloud 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Real Time 15 SP7 kernel-source-rt In progress
SUSE Linux Enterprise Server 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Server 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Server 15 SP7 kernel-default In progress
SUSE Linux Enterprise Server 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Server 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Server 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Server 15 SP7 kernel-source In progress
SUSE Linux Enterprise Server 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Server 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Server 16.0 kernel-default Affected
SUSE Linux Enterprise Server 16.0 kernel-source In progress
SUSE Linux Enterprise Server 16.1 kernel-default Affected
SUSE Linux Enterprise Server 16.1 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-64kb In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-azure In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-default-base In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-docs In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-obs-build In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-source In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-syms In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP7 kernel-zfcpdump In progress
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-default Affected
SUSE Linux Enterprise Server for SAP applications 16.0 kernel-source In progress
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-default Affected
SUSE Linux Enterprise Server for SAP applications 16.1 kernel-source Affected
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-default In progress
SUSE Linux Enterprise Workstation Extension 15 SP7 kernel-source Affected
SUSE Linux Micro 6.0 kernel-default Affected
SUSE Linux Micro 6.0 kernel-source Affected
SUSE Linux Micro 6.0 kernel-source-rt Affected
SUSE Linux Micro 6.1 kernel-default Affected
SUSE Linux Micro 6.1 kernel-source Affected
SUSE Linux Micro 6.1 kernel-source-rt Affected
SUSE Linux Micro 6.2 kernel-default Affected
SUSE Linux Micro 6.2 kernel-source In progress
SUSE Linux Micro Extras 6.0 kernel-default Affected
SUSE Linux Micro Extras 6.0 kernel-source Affected
SUSE Linux Micro Extras 6.0 kernel-source-rt Affected
SUSE Linux Micro Extras 6.1 kernel-default Affected
SUSE Linux Micro Extras 6.1 kernel-source Affected
SUSE Real Time Module 15 SP7 kernel-source-rt In progress
openSUSE Leap 16.0 kernel-source Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 12 SP5 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-default Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP4 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP5 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP6 kernel-source Affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-default Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 12 SP5-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP4 kernel-source Affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP4-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP5 kernel-source Affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP5-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP6 kernel-source Affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP6-LTSS kernel-source Affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-default Not affected
SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-default Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 kernel-source Affected
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 kernel-source Not affected
SUSE Enterprise Storage 6 kernel-source Not affected
SUSE Enterprise Storage 7 kernel-source Affected
SUSE Enterprise Storage 7.1 kernel-source Affected
SUSE Linux Enterprise Desktop 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Desktop 15 SP2 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP3 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP4 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP5 kernel-source Affected
SUSE Linux Enterprise Desktop 15 SP6 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS kernel-source Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS kernel-source Affected
SUSE Linux Enterprise Micro 5.0 kernel-default Not affected
SUSE Linux Enterprise Micro 5.1 kernel-default Affected
SUSE Linux Enterprise Micro 5.2 kernel-default Affected
SUSE Linux Enterprise Micro 5.2 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 kernel-source Affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Module for Development Tools 15 SP2 kernel-source Affected
SUSE Linux Enterprise Module for Development Tools 15 SP3 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP2 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP3 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source Affected
SUSE Linux Enterprise Real Time 15 SP4 kernel-source-rt Affected
SUSE Linux Enterprise Real Time 15 SP5 kernel-source-rt Affected
SUSE Linux Enterprise Server 11 SP4 kernel-source Not affected
SUSE Linux Enterprise Server 11 SP4-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-BCL kernel-source Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-default Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS kernel-source Not affected
SUSE Linux Enterprise Server 15 SP2 kernel-source Affected
SUSE Linux Enterprise Server 15 SP2-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP2-LTSS kernel-source Affected
SUSE Linux Enterprise Server 15 SP3 kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-BCL kernel-source Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-default Affected
SUSE Linux Enterprise Server 15 SP3-LTSS kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 kernel-source Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 kernel-source Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 kernel-source Affected
SUSE Manager Proxy 4.0 kernel-source Not affected
SUSE Manager Proxy 4.1 kernel-source Affected
SUSE Manager Proxy 4.2 kernel-source Affected
SUSE Manager Proxy 4.3 kernel-source Affected
SUSE Manager Proxy LTS 4.3 kernel-source Affected
SUSE Manager Retail Branch Server 4.0 kernel-source Not affected
SUSE Manager Retail Branch Server 4.1 kernel-source Affected
SUSE Manager Retail Branch Server 4.2 kernel-source Affected
SUSE Manager Retail Branch Server 4.3 kernel-source Affected
SUSE Manager Retail Branch Server LTS 4.3 kernel-source Affected
SUSE Manager Server 4.0 kernel-source Not affected
SUSE Manager Server 4.1 kernel-source Affected
SUSE Manager Server 4.2 kernel-source Affected
SUSE Manager Server 4.3 kernel-source Affected
SUSE Manager Server LTS 4.3 kernel-source Affected
SUSE Real Time Module 15 SP4 kernel-source-rt Affected
SUSE Real Time Module 15 SP5 kernel-source-rt Affected
openSUSE Leap 15.3 kernel-source Affected
openSUSE Leap 15.4 kernel-source Affected
openSUSE Leap 15.4 kernel-source-rt Affected
openSUSE Leap 15.5 kernel-source Affected
openSUSE Leap 15.5 kernel-source-rt Affected
openSUSE Leap 15.6 kernel-source Affected

SUSE Timeline for this CVE

CVE page created: Sat Aug 15 17:40:13 2026
CVE page last modified: Fri Sep 4 17:45:46 2026