CVE-2026-80841: Linux kernel · net/packet: defer vmalloc TX_RING free until skbs finish
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ed126ca71d4d949ad99f40b974a8f7685e808f8b : patch Linux kernel soon.
Data as of 30 Oct 2026, 13:18 UTC
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
Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/ed126ca71d4d949ad99f40b974a8f7685e808f8b (opens in a new tab)
- git.kernel.org/stable/c/debf9f50140b3df3949ebcb97d4450f8993fe32d (opens in a new tab)
- git.kernel.org/stable/c/4ce6e2d2e38055b2012bd5fdb0c8a8183c8a1b0c (opens in a new tab)
- git.kernel.org/stable/c/ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b (opens in a new tab)
- git.kernel.org/stable/c/0189dce07db2dc059ae0570e06758ec4233c6e11 (opens in a new tab)
- git.kernel.org/stable/c/550d00aa58193fb649a09a9c9e338c685adad784 (opens in a new tab)
- git.kernel.org/stable/c/992cc9f94ca924089a506ba9b327caa9af797529 (opens in a new tab)