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VulnerabilityPublished Updated

CVE-2026-43077: Linux kernel · crypto: algif_aead – Fix minimum RX size check for decryption

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fd427dd84f224309afbcc2cb67c7bb770a01265c : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:18 UTC

Severity
Unrated

Rated by Threat Radar · 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 fd427dd84f224309afbcc2cb67c7bb770a01265c, e86ab1e5661386a874fbb8551f0c04b8e9f8ad22, af2fa2fbbced26129813274b8b3f7705f280e174 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 May 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 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < fd427dd84f224309afbcc2cb67c7bb770a01265c
Fixed in
  • fd427dd84f224309afbcc2cb67c7bb770a01265c
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < e86ab1e5661386a874fbb8551f0c04b8e9f8ad22
Fixed in
  • e86ab1e5661386a874fbb8551f0c04b8e9f8ad22
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < af2fa2fbbced26129813274b8b3f7705f280e174
Fixed in
  • af2fa2fbbced26129813274b8b3f7705f280e174
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < 78cea133daf721698876e56135049a96d39d610a
Fixed in
  • 78cea133daf721698876e56135049a96d39d610a
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < 74a66fdb5282d89e348b00c42cfca3a936946d94
Fixed in
  • 74a66fdb5282d89e348b00c42cfca3a936946d94
LinuxLinuxAffected
  • ≥ d887c52d6ae43aeebd249b5f2f1333e60236aa60, < 3d14bd48e3a77091cbce637a12c2ae31b4a1687c
Fixed in
  • 3d14bd48e3a77091cbce637a12c2ae31b4a1687c

AI-suggested

A fix is available and has been applied in the Linux kernel versions identified by the provided commit hashes. Users and administrators should update to a Linux kernel version that includes these fixes to remediate the vulnerability.

Description

A vulnerability in the Linux kernel's crypto subsystem (algif_aead) involved an incorrect minimum receive buffer size check during decryption. The check did not account for the tag size, potentially causing improper handling of decryption buffers. This issue has been fixed by adding the required extra length to the size check.

References

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