CVE-2025-39962 – rxrpc: Fix untrusted unsigned subtract

CVE ID : CVE-2025-39962

Published : Oct. 9, 2025, 12:13 p.m. | 24 minutes ago

Description : 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.

Severity: 0.0 | NA

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