In the Linux kernel, the following vulnerability has been resolved: inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush O
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30일 내 악용 확률 예측
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CVSS 벡터 · 메트릭
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H약점 (CWE)
- CWE-416
Use-After-Free — 해제된 메모리를 다시 사용해 충돌·코드 실행 유발.
상세 설명
In the Linux kernel, the following vulnerability has been resolved:
inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
On netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and
flushes every fragment queue that is not yet complete using
inet_frag_queue_flush(). That helper frees all the skbs queued on the
fragment queue but does not set INET_FRAG_COMPLETE, and leaves
q->fragments_tail and q->last_run_head pointing at the freed skbs.
The queue itself stays in the rhashtable.
fqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups,
but it cannot stop a fragment that already obtained the queue through
inet_frag_find() earlier and stalled just before taking the queue lock.
Once that fragment resumes after the flush and takes the queue lock,
it passes the INET_FRAG_COMPLETE check and then dereferences the freed
fragments_tail. inet_frag_queue_insert() reads FRAG_CB() and ->len of
that pointer and, on the append path, writes ->next_frag, causing a
slab use-after-free. IPv6, nf_conntrack_reasm6 and 6lowpan reassembly
share the same flush path and are affected as well.
Reset rb_fragments, fragments_tail and last_run_head in
inet_frag_queue_flush() so a flushed queue no longer points at the
freed skbs. A fragment that resumes after the flush and takes the
queue lock then finds an empty queue and starts a new run instead of
dereferencing the freed fragments_tail. ip_frag_reinit() already
performed this reset after its own flush, so drop the now duplicate
code there.
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영향받는 제품·버전
- linux linux_kernel6.18.3 - 6.18.36linux
- linux linux_kernel6.19.1 - 7.0.13linux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
- linux linux_kernellinux
영향받는 구성 (CPE) 17
- linux linux_kernel≥ 6.18.3 < 6.18.36cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- linux linux_kernel 6.12.93cpe:2.3:o:linux:linux_kernel:6.12.93:*:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
- linux linux_kernel 6.19cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*
- linux linux_kernel 7.1cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:*
참고 자료 8
- https://access.redhat.com/security/cve/CVE-2026-53175Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2492840Issue TrackingThird Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53175.jsonThird Party Advisory
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