CVE-2026-43201: Linux kernel · APEI/GHES: ARM processor Error: don't go past allocated memory
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd : update Linux kernel when convenient.
Data as of 6 Nov 2026, 15:50 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
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 db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd, 136093ba4161e0080088abff48273f6830a47766, 87880af2d24e62a84ed19943dbdd524f097172f2 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 6 May 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
|
| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in Linux kernel versions 6.12.75, 6.18, and 6.18.16. Users and administrators should upgrade to these or later kernel versions to remediate the issue. No additional mitigation steps are indicated or required.
Description
A vulnerability in the Linux kernel's APEI/GHES ARM processor error handling was fixed to prevent accessing memory beyond allocated bounds. The flaw occurred when the BIOS generated very small or incomplete ARM Processor Error records, causing the kernel to dereference invalid memory leading to kernel OOPS errors. The fix adds checks to avoid dereferencing out-of-bounds section_length and context_info size fields, preventing crashes during error processing.
References
- git.kernel.org/stable/c/242c652849d979d0133c315a42d9acea0ff88390 (opens in a new tab)
- git.kernel.org/stable/c/136093ba4161e0080088abff48273f6830a47766 (opens in a new tab)
- git.kernel.org/stable/c/db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd (opens in a new tab)
- git.kernel.org/stable/c/87880af2d24e62a84ed19943dbdd524f097172f2 (opens in a new tab)