CVE-2026-80876: Linux kernel · ring-buffer: Fix event length with forced 8-byte alignment
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ec5e96aee75d27779b9a860307679f13f33adb0c : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:34 UTC
Rated Low 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 ec5e96aee75d27779b9a860307679f13f33adb0c, dbcb8635b1eb7603818591cf745c7b1d714f7ac6, cfada73fabe2ccc06ec77fe2ceaa088689213326 +5
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 6 Nov 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 specific Linux kernel commits. Users should update to a kernel version that includes the fix identified by the listed commit hashes to resolve the issue. No additional mitigation steps are necessary as the patch corrects the event length calculation.
Description
A vulnerability in the Linux kernel's ring-buffer event length calculation was fixed. The issue caused small events on architectures with forced 8-byte alignment to report a data length 4 bytes larger than expected, leading to inconsistent event data length reporting. This was observed on riscv64 kernels with 64-bit aligned access enabled. The fix ensures consistent event length accounting by adjusting the calculation when RB_FORCE_8BYTE_ALIGNMENT is true.
References
- git.kernel.org/stable/c/7c9f0ccf9f04142458d2ac3d39414f4acae242f0 (opens in a new tab)
- git.kernel.org/stable/c/24c3fa71f9947b0e1f3b954db1b769b44140192e (opens in a new tab)
- git.kernel.org/stable/c/14057268e79654c3e8ea2c9b5204cb9644b2964d (opens in a new tab)
- git.kernel.org/stable/c/dbcb8635b1eb7603818591cf745c7b1d714f7ac6 (opens in a new tab)
- git.kernel.org/stable/c/cfada73fabe2ccc06ec77fe2ceaa088689213326 (opens in a new tab)
- git.kernel.org/stable/c/ec5e96aee75d27779b9a860307679f13f33adb0c (opens in a new tab)
- git.kernel.org/stable/c/3a63a11897c7ba32d1be7a3fdbc48a8b01cf4992 (opens in a new tab)
- git.kernel.org/stable/c/c37e0a4b79a6bbb96ce5ffe279d7c001e20529e0 (opens in a new tab)