High severity7.5NVD Advisory· Published Oct 9, 2025· Updated Jul 30, 2026
CVE-2025-39962
CVE-2025-39962
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.
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Affected products
106.16+ 8 more
- (no CPE)range: 6.16
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=6.16,<6.16.9
- cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
2News mentions
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