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VulnerabilityPublished Updated

CVE-2025-40078: Linux kernel · bpf: Explicitly check accesses to bpf_sock_addr

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fe9d33f0470350558cb08cecb54cf2267b3a45d2 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 15:03 UTC

Severity
Low

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

Thin evidence

One scorer or none
Patch
Available – fixed in fe9d33f0470350558cb08cecb54cf2267b3a45d2, de44cdc50d2dce8718cb57deddf9cf1be9a7759f, cdeafacb4f9ff261a96baef519e29480fd7b1019 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Oct 2025

  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 10 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < fe9d33f0470350558cb08cecb54cf2267b3a45d2
Fixed in
  • fe9d33f0470350558cb08cecb54cf2267b3a45d2
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < de44cdc50d2dce8718cb57deddf9cf1be9a7759f
Fixed in
  • de44cdc50d2dce8718cb57deddf9cf1be9a7759f
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < cdeafacb4f9ff261a96baef519e29480fd7b1019
Fixed in
  • cdeafacb4f9ff261a96baef519e29480fd7b1019
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69
Fixed in
  • ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < 76e04bbb4296fb6eac084dbfc27e02ccc744db3e
Fixed in
  • 76e04bbb4296fb6eac084dbfc27e02ccc744db3e
LinuxLinuxAffected
  • ≥ 1cedee13d25ab118d325f95588c1a084e9317229, < 6fabca2fc94d33cdf7ec102058983b086293395f
Fixed in
  • 6fabca2fc94d33cdf7ec102058983b086293395f

AI-suggested

A fix is available and has been applied in multiple Linux kernel commits. Users should update their Linux kernel to a version including these fixes to resolve the issue. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's BPF subsystem involves improper validation of accesses to the bpf_sock_addr structure. Specifically, an implicit padding area after the msg_src_ip4 field was not properly checked, causing a verifier bug during context access conversion. This flaw was identified by Syzkaller and has been fixed by explicitly validating all fields of bpf_sock_addr in the kernel code.

References

Community reviews

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