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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)

PUBLISHED Reserved 2025-04-16 | Published 2025-05-09 | Updated 2026-01-02 | Assigner Linux

Product status

Default status
unaffected

070b3656cf228eaaef7b28b59264c5c7cdbdd0fb (git) before 468ff4a7c61fb811c596a7c44b6a5455e40fd12b
affected

070b3656cf228eaaef7b28b59264c5c7cdbdd0fb (git) before a68768e280b7d0c967ea509e791bb9b90adc94a5
affected

070b3656cf228eaaef7b28b59264c5c7cdbdd0fb (git) before c548f95688e2b5ae0e2ae43d53cf717156c7d034
affected

070b3656cf228eaaef7b28b59264c5c7cdbdd0fb (git) before 374e4cd75617c8c2552f562f39dd989583f5c330
affected

070b3656cf228eaaef7b28b59264c5c7cdbdd0fb (git) before d0259a856afca31d699b706ed5e2adf11086c73b
affected

Default status
affected

4.1
affected

Any version before 4.1
unaffected

6.1.136 (semver)
unaffected

6.6.89 (semver)
unaffected

6.12.26 (semver)
unaffected

6.14.5 (semver)
unaffected

6.15 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/05/msg00045.html

git.kernel.org/...c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b

git.kernel.org/...c/a68768e280b7d0c967ea509e791bb9b90adc94a5

git.kernel.org/...c/c548f95688e2b5ae0e2ae43d53cf717156c7d034

git.kernel.org/...c/374e4cd75617c8c2552f562f39dd989583f5c330

git.kernel.org/...c/d0259a856afca31d699b706ed5e2adf11086c73b

cve.org (CVE-2025-37879)

nvd.nist.gov (CVE-2025-37879)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.