CVE-2025-40078: Linux kernel · bpf: Explicitly check accesses to bpf_sock_addr
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fe9d33f0470350558cb08cecb54cf2267b3a45d2 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 15:03 UTC
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
Disclosed: evidence found.
CVE published 28 Oct 2025
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 10 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f (opens in a new tab)
- git.kernel.org/stable/c/76e04bbb4296fb6eac084dbfc27e02ccc744db3e (opens in a new tab)
- git.kernel.org/stable/c/6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec (opens in a new tab)
- git.kernel.org/stable/c/4f00858cd9bbbdf67159e28b85a8ca9e77c83622 (opens in a new tab)
- git.kernel.org/stable/c/cdeafacb4f9ff261a96baef519e29480fd7b1019 (opens in a new tab)
- git.kernel.org/stable/c/fe9d33f0470350558cb08cecb54cf2267b3a45d2 (opens in a new tab)
- git.kernel.org/stable/c/ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69 (opens in a new tab)
- git.kernel.org/stable/c/6fabca2fc94d33cdf7ec102058983b086293395f (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)