Upstream information
Description
In the Linux kernel, the following vulnerability has been resolved:bpf: Fix reference count leak in bpf_prog_test_run_xdp()
syzbot is reporting
unregister_netdevice: waiting for sit0 to become free. Usage count = 2
problem. A debug printk() patch found that a refcount is obtained at
xdp_convert_md_to_buff() from bpf_prog_test_run_xdp().
According to commit ec94670fcb3b ("bpf: Support specifying ingress via
xdp_md context in BPF_PROG_TEST_RUN"), the refcount obtained by
xdp_convert_md_to_buff() will be released by xdp_convert_buff_to_md().
Therefore, we can consider that the error handling path introduced by
commit 1c1949982524 ("bpf: introduce frags support to
bpf_prog_test_run_xdp()") forgot to call xdp_convert_buff_to_md().
SUSE information
Overall state of this security issue: Does not affect SUSE products
SUSE Bugzilla entry: 1257213 [NEW] No SUSE Security Announcements cross referenced.SUSE Timeline for this CVE
CVE page created: Mon Jan 26 13:06:38 2026CVE page last modified: Mon Jan 26 13:06:38 2026