Critical severity9.8NVD Advisory· Published May 9, 2025· Updated Jul 30, 2026

CVE-2025-37879

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)

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Debian/linux
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Linux/Kernel3 versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: <6.1.136
- (no CPE)
- (no CPE)range: 4.1
osv-coords88 versions
pkg:linux/kernel pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-rt_debug&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-source-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-syms-rt&distro=openSUSE%20Leap%2015.6 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.6 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-coco_debug&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP6 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-kvmsmall&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-livepatch-SLE15-SP6-RT_Update_11&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-livepatch-SLE15-SP6_Update_12&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP6 pkg:rpm/suse/kernel-livepatch-SLE15-SP7-RT_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7 pkg:rpm/suse/kernel-livepatch-SLE15-SP7_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP7 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7 pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP7 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-source-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.0 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Linux%20Micro%206.1 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP6 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP7 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSS pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP6 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP7 pkg:rpm/suse/kernel-syms-coco&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Confidential%20Computing%20Technical%20Preview%2015%20SP6 pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP6 pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP7 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP6 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7 pkg:rpm/suse/kgraft-patch-SLE12-SP5_Update_69&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP5
>= 4.1.0, < 6.1.136+ 87 more
- (no CPE)range: >= 4.1.0, < 6.1.136
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1.150600.12.24.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-150600.23.53.1.150600.12.24.1
- (no CPE)range: < 6.4.0-150700.53.3.1.150700.17.2.1
- (no CPE)range: < 6.4.0-30.1.21.8
- (no CPE)range: < 6.4.0-30.1.21.8
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 1-150600.1.3.2
- (no CPE)range: < 1-150600.13.3.1
- (no CPE)range: < 1-150700.1.3.1
- (no CPE)range: < 1-150700.15.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-33.1
- (no CPE)range: < 6.4.0-33.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150700.7.3.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150700.7.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-30.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-33.1
- (no CPE)range: < 6.4.0-33.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150700.7.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 4.12.14-122.261.1
- (no CPE)range: < 6.4.0-150600.8.40.1
- (no CPE)range: < 6.4.0-150700.20.3.1
- (no CPE)range: < 6.4.0-15061.21.coco15sp6.1
- (no CPE)range: < 6.4.0-150600.10.39.1
- (no CPE)range: < 6.4.0-150700.7.3.1
- (no CPE)range: < 6.4.0-150600.23.53.1
- (no CPE)range: < 6.4.0-150700.53.3.1
- (no CPE)range: < 1-8.3.1

Patches

Vulnerability mechanics

References

git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330nvdPatch
git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12bnvdPatch
git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5nvdPatch
git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034nvdPatch
git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73bnvdPatch
lists.debian.org/debian-lts-announce/2025/05/msg00045.htmlnvdMailing ListThird Party Advisory

News mentions

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cvss	0.637
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000