Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 6.1.136 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330Patch
- https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12bPatch
- https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5Patch
- https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034Patch
- https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73bPatch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2025-37879?
CVE-2025-37879 is a vulnerability with a CVSS score of 9.8 (CRITICAL). In the Linux kernel, the following vulnerability has been resolved: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server i...
How severe is CVE-2025-37879?
CVE-2025-37879 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-37879?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.