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VulnerabilityPublished Updated

CVE-2026-80841: Linux kernel · net/packet: defer vmalloc TX_RING free until skbs finish

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ed126ca71d4d949ad99f40b974a8f7685e808f8b : patch Linux kernel soon.

Data as of 30 Oct 2026, 13:18 UTC

Severity
High

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

Thin evidence

One scorer or none
Patch
Available – fixed in ed126ca71d4d949ad99f40b974a8f7685e808f8b, ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b, debf9f50140b3df3949ebcb97d4450f8993fe32d +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < ed126ca71d4d949ad99f40b974a8f7685e808f8b
Fixed in
  • ed126ca71d4d949ad99f40b974a8f7685e808f8b
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b
Fixed in
  • ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < debf9f50140b3df3949ebcb97d4450f8993fe32d
Fixed in
  • debf9f50140b3df3949ebcb97d4450f8993fe32d
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < 992cc9f94ca924089a506ba9b327caa9af797529
Fixed in
  • 992cc9f94ca924089a506ba9b327caa9af797529
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < 550d00aa58193fb649a09a9c9e338c685adad784
Fixed in
  • 550d00aa58193fb649a09a9c9e338c685adad784
LinuxLinuxAffected
  • ≥ b013840810c221f2b0cf641d01531526052dc1fb, < 0189dce07db2dc059ae0570e06758ec4233c6e11
Fixed in
  • 0189dce07db2dc059ae0570e06758ec4233c6e11

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update to a Linux kernel version that includes these fixes. No additional mitigation is required beyond applying the official patch.

Description

A vulnerability in the Linux kernel's net/packet subsystem related to AF_PACKET TX_RING handling has been fixed. The issue involved premature freeing of vmalloc-backed TX_RING memory before all socket buffers (skbs) finished using it, potentially causing use-after-free conditions. The fix defers freeing vmalloc TX_RING memory until all skbs complete, ensuring safe memory access and preventing race conditions during ring replacement and teardown.

References

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