7.1

CVE-2025-37879

9p/net: fix improper handling of bogus negative read/write replies

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)
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 6.1.136
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.89
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.26
Linux ≫ Linux Kernel Version >= 6.13 < 6.14.5
Debian ≫ Debian Linux Version11.0
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.15
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b
Patch
https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5
Patch
https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034
Patch
https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330
Patch
https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b
Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
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