CVE-2026-31640 Details
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix use of wrong skb when comparing queued RESP challenge serial In rxrpc_post_response(), the code should be comparing the challenge serial number from the cached response before deciding to switch to a newer response, but looks at the newer packet private data instead, rendering the comparison always false. Fix this by switching to look at the older packet. Fix further[1] to substitute the new packet in place of the old one if newer and also to release whichever we don't use.
A vulnerability in the Linux kernel's Rxrpc implementation has been addressed. The issue arose in the 'rxrpc_post_response()' function, where the code incorrectly compared challenge serial numbers from cached responses. Instead of referencing the older, cached data, it evaluated the newer packet's private information, leading to a perpetual mismatch. This flaw has been corrected by ensuring the comparison is made with the appropriate, older packet. Additionally, the fix allows for the newer packet to replace the old one when applicable, while also releasing any unused data.
Users can upgrade to the latest version of the Linux kernel to address this vulnerability. The specific commit containing the fix can be downloaded as a tarball.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/20386e7f8d97475b8d815873e246423317ec4260 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9132b1a7bf83b4a8042fffbc99d075b727a16742 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b33f5741bb187db8ff32e8f5b96def77cc94dfca | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-401 | Missing Release of Memory after Effective Lifetime | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.16.1, < 6.18.23 >= 6.19, < 6.19.13 6.16 - 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc7 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Apr 27, 2026 | Initial Analysis | [email protected] |
| Apr 27, 2026 | CVE Modified | kernel.org |
| Apr 24, 2026 | New CVE Received | kernel.org |