CVE-2025-39962

Summary

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix untrusted unsigned subtract

Fix the following Smatch static checker warning:

net/rxrpc/rxgk_app.c:65 rxgk_yfs_decode_ticket() warn: untrusted unsigned subtract. 'ticket_len - 10 * 4'

by prechecking the length of what we're trying to extract in two places in the token and decoding for a response packet.

Also use sizeof() on the struct we're extracting rather specifying the size numerically to be consistent with the other related statements.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/71571e187106631a8127f2dde780f35caa358d33
• https://git.kernel.org/stable/c/2429a197648178cd4dc930a9d87c13c547460564

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