Buffer overflow in Linux
CVE-2025-39962
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.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (14.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a, 6.16, 0
- Linux Linux_kernel — versions 6.17
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2025-39962?
- CVE-2025-39962 is a high-severity vulnerability in Linux, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2025-10-09.
- How severe is CVE-2025-39962?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-39962 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.