CVE-2026-31638 Details
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.
A vulnerability in the Linux kernel's RxRPC implementation can cause a kernel crash by mishandling to-client packets. The issue arises when a client call on a channel is terminated, leaving no call reference to manage. The error handling process incorrectly drops a call reference, which should only be done if one was actually acquired. This flaw transforms a protocol error into a crash, disrupting normal operations.
Users can apply the latest patches available in the Linux kernel stable tree to address this vulnerability.
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
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d | kernel.org | Patch |
| https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.2.1, < 6.6.135 >= 6.7, < 6.12.82 >= 6.13, < 6.18.23 >= 6.19, < 6.19.13 6.2 - 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 |