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Linux KernelOperating system · Linux

CVE-2025-38067

MEDIUM · 5.5 CVSS v3.1 Published 2025-06-18
Fix available
A fix is available. Upgrade to 5.10.240 / 5.15.189 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the Linux kernel, the following vulnerability has been resolved: rseq: Fix segfault on registration when rseq_cs is non-zero The rseq_cs field is documented as being set to 0 by user-space prior to registration, however this is not currently enforced by the kernel. This can result in a segfault on return to user-space if the value stored in the rseq_cs field doesn't point to a valid struct rseq_cs. The correct solution to this would be to fail the rseq registration when the rseq_cs field is non-zero. However, some older versions of glibc will reuse the rseq area of previous threads without clearing the rseq_cs field and will also terminate the process if the rseq registration fails in a secondary thread. This wasn't caught in testing because in this case the leftover rseq_cs does point to a valid struct rseq_cs. What we can do is clear the rseq_cs field on registration when it's non-zero which will prevent segfaults on registration and won't break the glibc versions that reuse rseq areas on thread creation.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 4.18, < 5.10.240>= 5.11, < 5.15.189>= 5.16, < 6.1.146>= 6.2, < 6.6.99>= 6.7, < 6.12.39>= 6.13, < 6.14.9
Debian LinuxOperating system
Affected:= 11.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 5.10.240 / 5.15.189 / 6.1.146 or later
Fixed in 5.10.2405.15.1896.1.146
Vendor patch git.kernel.org →
Recommended fix High confidence

Linux Kernel 5.10.240 / 5.15.189 / 6.1.146 / 6.6.99 or later (depending on branch); Debian 11.0 to kernel with CVE-2025-38067 fix

  1. 1. Identify the current running kernel version using `uname -r`
  2. 2. Determine which kernel branch your version belongs to (e.g., 5.10.x, 5.15.x, 6.1.x, 6.6.x)
  3. 3. For Debian 11 (Bullseye), check for available kernel updates via `apt update && apt list --upgradable`
  4. 4. Upgrade to a fixed kernel version: 5.10.240+, 5.15.189+, 6.1.146+, or 6.6.99+ depending on your branch
  5. 5. Reboot the system to load the new kernel
  6. 6. Verify the fix is applied by checking the kernel version with `uname -r` and confirming it meets or exceeds the minimum fixed version for your branch
Caveat Low risk - this is a kernel bug fix that clears a potentially invalid field; minor risk of behavior change for applications that incorrectly rely on non-zero rseq_cs persisting across rseq registration

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-38067 in production — separate from our analysis above.

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