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VulnerabilityPublished Updated

CVE-2026-74486: Linux kernel · binfmt_misc: use exe_file_deny_write_access() for the interpreter clone

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fa5990ca8fd917003e526036bcc50413edb9722c : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:56 UTC

Severity
Medium

Rated Medium 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 fa5990ca8fd917003e526036bcc50413edb9722c, f1e7ea3c8e070f19771cdaef55bbeda1359ad490, f0edbaf487e4653a680a7abb91c1df94cb7886aa +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Aug 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
  • ≥ 0357ef03c94ef835bd44a0658b8edb672a9dbf51, < fa5990ca8fd917003e526036bcc50413edb9722c
Fixed in
  • fa5990ca8fd917003e526036bcc50413edb9722c
LinuxLinuxAffected
  • ≥ 483217fd6f7ccd98b3ed2531a54f75ed144b4499, < f1e7ea3c8e070f19771cdaef55bbeda1359ad490
Fixed in
  • f1e7ea3c8e070f19771cdaef55bbeda1359ad490
LinuxLinuxAffected
  • ≥ 0357ef03c94ef835bd44a0658b8edb672a9dbf51, < f0edbaf487e4653a680a7abb91c1df94cb7886aa
Fixed in
  • f0edbaf487e4653a680a7abb91c1df94cb7886aa
LinuxLinuxAffected
  • ≥ c152be5adc0975c75cc4f50891c9072d52d60b47, < eea4b7c7711b1e425272d23352af157f45f4c3e3
Fixed in
  • eea4b7c7711b1e425272d23352af157f45f4c3e3
LinuxLinuxAffected
  • ≥ 5b432413f7bbbc8b935138490a57be05c1921684, < c65eb018c12179b5e2c7afe1f0956298576fecec
Fixed in
  • c65eb018c12179b5e2c7afe1f0956298576fecec
LinuxLinuxAffected
  • ≥ 0357ef03c94ef835bd44a0658b8edb672a9dbf51, < 255a758697da87a205e072e0cfc35897b8f743b1
Fixed in
  • 255a758697da87a205e072e0cfc35897b8f743b1

AI-suggested

A fix is available in the Linux kernel versions identified by the provided commit hashes. Users should update to a fixed kernel version to resolve this issue. No additional mitigation is required as the patch properly addresses the vulnerability.

Description

A vulnerability in the Linux kernel's binfmt_misc subsystem was fixed by changing how write access denial is handled for interpreter clones. Previously, the denial and allowance of write access used different methods, causing the interpreter inode's write count to decrease incorrectly and potentially leaving the interpreter unwritable even after use. The fix ensures consistent use of exe_file_deny_write_access() and proper failure propagation, causing exec calls to fail with ETXTBSY if the interpreter is concurrently open for writing.

References

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