VulnerabilityPublished 6 May 2026Updated 6 Nov 2026

CVE-2026-43171: Linux kernel · EFI/CPER: don't dump the entire memory region

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 : patch Linux kernel soon.

Data as of 6 Nov 2026, 15:51 UTC

Severity

High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

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 a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91, 7780c0bad2a3a70a8c0113a33c02f4151d901eb3, 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff +5

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91	Fixed in a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 7780c0bad2a3a70a8c0113a33c02f4151d901eb3	Fixed in 7780c0bad2a3a70a8c0113a33c02f4151d901eb3
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff	Fixed in 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 55cc6fe5716f678f06bcb95140882dfa684464ec	Fixed in 55cc6fe5716f678f06bcb95140882dfa684464ec
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 54e131db4cdffd946db890ff33ff2647053fd4f6	Fixed in 54e131db4cdffd946db890ff33ff2647053fd4f6
LinuxLinux	Affected ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 5a9b1dda8481b82851a655c3bcc5b44879b95334	Fixed in 5a9b1dda8481b82851a655c3bcc5b44879b95334

AI-suggested

A fix is available in Linux kernel commits identified by hashes including a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 and others. Users should update to a patched kernel version containing these fixes to prevent exploitation of this issue.

Description

A vulnerability in the Linux kernel's EFI/CPER error handling logic could cause excessive memory dumping, potential data disclosure, and kernel OOPS due to improper bounds checking of error record lengths. This issue affects Linux kernel version 5.7 and was fixed by adding checks to prevent dumping beyond valid memory regions.

Impact

Exploitation of this vulnerability can cause the kernel to spend excessive time dumping large memory regions, potentially disclose sensitive memory contents, and trigger kernel OOPS crashes if unmapped memory is accessed during the dump process.

Summary

The Linux kernel's cper_print_fw_err() function did not properly verify that the error record length was sufficient to handle the offset value. On systems with faulty firmware, this could cause an underflow in length calculation, leading to dumping of the entire memory region. This flaw could result in prolonged processing times, unintended disclosure of memory contents, or kernel OOPS if unmapped memory is accessed. The vulnerability was addressed by adding validation to ensure the section length is adequate before performing a hex dump.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 15:51 UTC

Technical details

References

Community reviews

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