CVE-2025-38591: Linux kernel · bpf: Reject narrower access to pointer ctx fields
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in feae34c992eb7191862fb1594c704fbbf650fef8 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 12:50 UTC
Rated Medium by Threat Radar's AI analysis · 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, 2026-06-10.
- Patch
- Available – fixed in feae34c992eb7191862fb1594c704fbbf650fef8, e09299225d5ba3916c91ef70565f7d2187e4cca0, e2e9599f3503df7cf3569d2b6c50d5488fb59435 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Aug 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 specific Linux kernel commits. Users should update their Linux kernel to a version that includes these fixes to prevent kernel warnings and verifier errors caused by invalid BPF context accesses.
Description
A vulnerability in the Linux kernel's BPF verifier allows improper narrower access to pointer context fields, causing kernel warnings and verifier errors. This issue affects BPF programs that perform narrower reads on certain pointer fields in context structures, such as __sk_buff. The flaw has been fixed to properly reject invalid BPF context accesses, preventing verifier bugs and potential kernel instability.
References
- git.kernel.org/stable/c/7847c4140e06f6e87229faae22cc38525334c156 (opens in a new tab)
- git.kernel.org/stable/c/feae34c992eb7191862fb1594c704fbbf650fef8 (opens in a new tab)
- git.kernel.org/stable/c/33660d44e789edb4f303210c813fc56d56377a90 (opens in a new tab)
- git.kernel.org/stable/c/e2e9599f3503df7cf3569d2b6c50d5488fb59435 (opens in a new tab)
- git.kernel.org/stable/c/058a0da4f6d916a79b693384111bb80a90d73763 (opens in a new tab)
- git.kernel.org/stable/c/202900ceeef67458c964c2af6e1427c8e533ea7c (opens in a new tab)
- git.kernel.org/stable/c/e09299225d5ba3916c91ef70565f7d2187e4cca0 (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)