CVE-2025-37879
9p/net: fix improper handling of bogus negative read/write replies
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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)
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | May 9, 2025 |
| Last Updated | May 11, 2026 |
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Affected Versions
Linux / Linux
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < 468ff4a7c61fb811c596a7c44b6a5455e40fd12b 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < a68768e280b7d0c967ea509e791bb9b90adc94a5 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < c548f95688e2b5ae0e2ae43d53cf717156c7d034 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < 374e4cd75617c8c2552f562f39dd989583f5c330 070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < d0259a856afca31d699b706ed5e2adf11086c73b
Linux / Linux
4.1
References
git.kernel.org: https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b git.kernel.org: https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5 git.kernel.org: https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034 git.kernel.org: https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330 git.kernel.org: https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html