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CVE-2026-31640

rxrpc: Fix use of wrong skb when comparing queued RESP challenge serial PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 5800b1cf3fd8ccab752a101865be1e76dac33142 before 9132b1a7bf83b4a8042fffbc99d075b727a16742; affected 5800b1cf3fd8ccab752a101865be1e76dac33142 before 20386e7f8d97475b8d815873e246423317ec4260; affected 5800b1cf3fd8ccab752a101865be1e76dac33142 before b33f5741bb187db8ff32e8f5b96def77cc94dfca
Linux / Linuxaffected 6.16; unaffected 0 before 6.16; unaffected 6.18.23 through 6.18.*; unaffected 6.19.13 through 6.19.*; unaffected 7.0 through *

CWE

No CWE identifiers supplied.

References