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VulnerabilityPublished Updated

CVE-2026-80742: Linux kernel · af_packet: Don't send zero-byte data in tpacket_snd().

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f09ac5682f1bb67981fcb6ead4d3cfe439225876 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:40 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in f09ac5682f1bb67981fcb6ead4d3cfe439225876, dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe, 7521e691c7c4f2231634c95053281ac888d1f452 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f09ac5682f1bb67981fcb6ead4d3cfe439225876
Fixed in
  • f09ac5682f1bb67981fcb6ead4d3cfe439225876
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe
Fixed in
  • dde212f8622f5cb36223fff1ebd6e6f2a3dc61fe
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7521e691c7c4f2231634c95053281ac888d1f452
Fixed in
  • 7521e691c7c4f2231634c95053281ac888d1f452
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 98c5914d6b7bd4b4675535908e57dea31f1efd6a
Fixed in
  • 98c5914d6b7bd4b4675535908e57dea31f1efd6a
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 80a702964467b998d254f16cc61c2c9a20540c9d
Fixed in
  • 80a702964467b998d254f16cc61c2c9a20540c9d
LinuxLinuxAffected
  • ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6bcd76c134c55c697148acb5c0194e9666abdf84
Fixed in
  • 6bcd76c134c55c697148acb5c0194e9666abdf84

AI-suggested

A fix is available in the Linux kernel source as indicated by the listed fixed commit versions. Users should update their Linux kernel to a version including these fixes to prevent the issue. No additional mitigation steps are required.

Description

A vulnerability in the Linux kernel's af_packet subsystem was fixed to prevent sending zero-byte packets via the TPACKET ring buffer. The flaw caused the kernel to forward empty socket buffers (skb) to the transmission queue, triggering assertion failures and warnings. The fix rejects zero-length packets to avoid this condition.

References

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