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CVE-2026-53175CRITICAL· 9.8MITRENVD대응게시일: 2026. 06. 25.수정일: 2026. 07. 15.CNA: 416baaa9-dc9f-4396-8d5f-8c081fb06d67Analyzed

In the Linux kernel, the following vulnerability has been resolved: inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush O

Memory-Corruption

위협 신호 · CVSS · EPSS · KEV

시급 검토· 이론 심각도 Critical
CVSS
9.8critical

이론적 심각도 점수

EPSS
0.3%상위 76.3%

30일 내 악용 확률 예측

KEV
미등재

실측 악용 기록 없음

권장 대응 기한3일 이내CISA SSVC 기준

즉시(3일 이내) 패치 — 최우선 대응

자동화 가능완전 장악외부 노출· KEV 미등재 · 자동화 가능 · 완전 장악 · 외부 노출

CVSS 벡터 · 메트릭

악용 경로
공격 벡터네트워크
공격 복잡도낮음
필요 권한불필요
사용자 상호작용불필요
범위불변
영향
기밀성 영향높음
무결성 영향높음
가용성 영향높음
버전별 점수
CVSS 3.19.8CRITICAL· 악용성 3.9· 영향도 5.9
CVSS 3.17.0HIGH· 악용성 1· 영향도 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

약점 (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 - 6.18.36
    linux
  • linux linux_kernel6.19.1 - 7.0.13
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux
  • linux linux_kernel
    linux

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:*:*:*:*:*:*