CVE-2026-99999: falha crítica em Linux
ipv4: validate checksum_start before completing checksum
Publicada em · Atualizada em
70Vexday Risk Score
Priorize a correção. Ela exploração observada pelo VulnCheck e tem prova de conceito pública.
ssvc Actcvss 9.3epss 0.2%
da publicação à arma1 dias
Publicada no NVD15 de out.
1ª PoC+1d
VulnCheck+4d
probabilidade de exploração
0.2%top 89% das CVEs
exploração observada
simVulnCheck
13 exploit(s) público(s)
In the Linux kernel, the following vulnerability has been resolved:
ipv4: validate checksum_start before completing checksum
If a packet with bad checksum metadata gets into the ipv4 stack,
skb_checksum_help can corrupt the network header and cause a bunch of
mischief.
This was discovered and reported by Paulos, and has been reporoduced
by others independently since.
We really shouldn't allow such packets in, but as a defence
in depth measure, let's also check before we complete the checksum.
A more complete validation at input is forthcoming, but needs more work.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Produtos afetados
Linux · LinuxPoCs públicas encontradas — 13
githubgithub.com/PeronGH/CVE-2026-99999★ 10githubgithub.com/gandli/CVE-2026-99999-pwnescape★ 3githubgithub.com/Quaerendir/cve-2026-99999-audit★ 2githubgithub.com/01luyicheng/CVE-2026-99999★ 2githubgithub.com/MChorfa/csumguard★ 1githubgithub.com/alvaroguzmancode/CVE-2026-99999★ 0githubgithub.com/nsrg-fmlorg/kpatch-alma-cve-2026-99999★ 0githubgithub.com/kingahmadr/CVE-2026-99999-kernel-check★ 0githubgithub.com/zakinko/kpatch-alma-cve-2026-99999★ 0githubgithub.com/shizuku198411/CVE-2026-99999-KVM-checksum-metadata-non-destructive-PoC★ 0githubgithub.com/nsrg-fmlorg/kpatch-rocky-cve-2026-99999★ 0vulncheckvulncheck.com/xdb/319a7fb4465fnão verificadovulncheckvulncheck.com/xdb/d78be1b0f067não verificado⚠ Recursos públicos, para você avaliar a exposição de sistemas que controla ou está autorizado a testar. Teste apenas com autorização.
CVEs relacionadas — Linux
No mesmo produto, das mais perigosas para as menos.
CVE-2024-53197HIGHALSA: usb-audio: Fix potential out-of-bound accesses for Extigy and Mbox devicesEPSS 4.1%KEVCVE-2026-31431HIGHcrypto: algif_aead - Revert to operating out-of-placeEPSS 3.4%KEVCVE-2024-53104HIGHmedia: uvcvideo: Skip parsing frames of type UVC_VS_UNDEFINED in uvc_parse_formatEPSS 3.4%KEVCVE-2025-39682CRITICALtls: fix handling of zero-length records on the rx_listEPSS 2.9%KEVCVE-2024-36971HIGHnet: fix __dst_negative_advice() raceEPSS 2.7%KEVCVE-2025-39964HIGHcrypto: af_alg - Disallow concurrent writes in af_alg_sendmsgEPSS 1.4%KEV
Referências
https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40ahttps://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbbhttps://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbfhttps://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8bhttps://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0https://pwn.ai/blog/pwnescapehttps://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challengehttp://www.openwall.com/lists/oss-security/2026/10/15/5