Riskcovery

CVE-2026-31638

rxrpc: Only put the call ref if one was acquired

State
Published
Severity
7.5 High
Published
Apr 24, 2026
Updated
Oct 19, 2026
Reserved
Mar 9, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 5e6ef4f1017c7f844e305283bbd8875af475e2fc to before b8f66447448d6c305a51413a67ec8ed26aa7d1ddAffected
  • 5e6ef4f1017c7f844e305283bbd8875af475e2fc to before 0c156aff8a2d4fa0d61db7837641975cf0e5452dAffected
  • 5e6ef4f1017c7f844e305283bbd8875af475e2fc to before 8299ca146489664e3c0c90a3b8900d8335b1ede4Affected
  • 5e6ef4f1017c7f844e305283bbd8875af475e2fc to before 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38Affected
  • 5e6ef4f1017c7f844e305283bbd8875af475e2fc to before 6331f1b24a3e85465f6454e003a3e6c22005a5c5Affected
LinuxLinux
  • 6.2Affected
  • before 6.2Not affected
  • 6.6.135 through 6.6.*Not affected
  • 6.12.82 through 6.12.*Not affected
  • 6.18.23 through 6.18.*Not affected
  • 6.19.13 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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