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VulnerabilityPublished Updated

CVE-2025-38591: Linux kernel · bpf: Reject narrower access to pointer ctx fields

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in feae34c992eb7191862fb1594c704fbbf650fef8 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 12:50 UTC

Severity
Medium

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

  1. Disclosed: evidence found.

    CVE published 19 Aug 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
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < feae34c992eb7191862fb1594c704fbbf650fef8
Fixed in
  • feae34c992eb7191862fb1594c704fbbf650fef8
LinuxLinuxAffected
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < e09299225d5ba3916c91ef70565f7d2187e4cca0
Fixed in
  • e09299225d5ba3916c91ef70565f7d2187e4cca0
LinuxLinuxAffected
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < e2e9599f3503df7cf3569d2b6c50d5488fb59435
Fixed in
  • e2e9599f3503df7cf3569d2b6c50d5488fb59435
LinuxLinuxAffected
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < 202900ceeef67458c964c2af6e1427c8e533ea7c
Fixed in
  • 202900ceeef67458c964c2af6e1427c8e533ea7c
LinuxLinuxAffected
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < 33660d44e789edb4f303210c813fc56d56377a90
Fixed in
  • 33660d44e789edb4f303210c813fc56d56377a90
LinuxLinuxAffected
  • ≥ f96da09473b52c09125cc9bf7d7d4576ae8229e0, < 7847c4140e06f6e87229faae22cc38525334c156
Fixed in
  • 7847c4140e06f6e87229faae22cc38525334c156

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

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