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)
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
070b3656cf228eaaef7b28b59264c5c7cdbdd0fb to < 468ff4a7c61fb811c596a7c44b6a5455e40fd12baffected070b3656cf228eaaef7b28b59264c5c7cdbdd0fb to < a68768e280b7d0c967ea509e791bb9b90adc94a5affected070b3656cf228eaaef7b28b59264c5c7cdbdd0fb to < c548f95688e2b5ae0e2ae43d53cf717156c7d034affected070b3656cf228eaaef7b28b59264c5c7cdbdd0fb to < 374e4cd75617c8c2552f562f39dd989583f5c330affected070b3656cf228eaaef7b28b59264c5c7cdbdd0fb to < d0259a856afca31d699b706ed5e2adf11086c73baffected
Linux Linux
Default version status: affected
4.1affected0 to < 4.1unaffected6.1.136 to ≤ 6.1.*unaffected6.6.89 to ≤ 6.6.*unaffected6.12.26 to ≤ 6.12.*unaffected6.14.5 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b ↗
- https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5 ↗
- https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034 ↗
- https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330 ↗
- https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b ↗
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html ↗