vulnerability
Ubuntu: (Multiple Advisories) (CVE-2025-37879): Linux kernel vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:L/AC:L/Au:S/C:C/I:N/A:C) | May 9, 2025 | Jun 26, 2025 | Feb 13, 2026 |
Severity
6
CVSS
(AV:L/AC:L/Au:S/C:C/I:N/A:C)
Published
May 9, 2025
Added
Jun 26, 2025
Modified
Feb 13, 2026
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)
Solutions
ubuntu-upgrade-linux-image-6-14-0-1004-realtimeubuntu-upgrade-linux-image-6-14-0-1007-awsubuntu-upgrade-linux-image-6-14-0-1007-aws-64kubuntu-upgrade-linux-image-6-14-0-1007-azureubuntu-upgrade-linux-image-6-14-0-1007-azure-fdeubuntu-upgrade-linux-image-6-14-0-1007-oracleubuntu-upgrade-linux-image-6-14-0-1007-oracle-64kubuntu-upgrade-linux-image-6-14-0-1007-raspiubuntu-upgrade-linux-image-6-14-0-1008-gcpubuntu-upgrade-linux-image-6-14-0-1008-gcp-64kubuntu-upgrade-linux-image-6-14-0-22-genericubuntu-upgrade-linux-image-6-14-0-22-generic-64kubuntu-upgrade-linux-image-6-8-0-100-genericubuntu-upgrade-linux-image-6-8-0-100-generic-64kubuntu-upgrade-linux-image-6-8-0-1047-gcpubuntu-upgrade-linux-image-6-8-0-1047-gcp-64kubuntu-upgrade-linux-image-6-8-0-1047-raspiubuntu-upgrade-linux-image-6-8-1-1041-realtimeubuntu-upgrade-linux-image-awsubuntu-upgrade-linux-image-aws-64kubuntu-upgrade-linux-image-azureubuntu-upgrade-linux-image-azure-fdeubuntu-upgrade-linux-image-gcpubuntu-upgrade-linux-image-gcp-6-8ubuntu-upgrade-linux-image-gcp-64kubuntu-upgrade-linux-image-gcp-64k-6-8ubuntu-upgrade-linux-image-genericubuntu-upgrade-linux-image-generic-6-8ubuntu-upgrade-linux-image-generic-64kubuntu-upgrade-linux-image-generic-64k-6-8ubuntu-upgrade-linux-image-generic-lpaeubuntu-upgrade-linux-image-intel-iotgubuntu-upgrade-linux-image-kvmubuntu-upgrade-linux-image-oracleubuntu-upgrade-linux-image-oracle-64kubuntu-upgrade-linux-image-raspiubuntu-upgrade-linux-image-raspi-6-8ubuntu-upgrade-linux-image-realtimeubuntu-upgrade-linux-image-realtime-6-8-1ubuntu-upgrade-linux-image-realtime-hwe-22-04ubuntu-upgrade-linux-image-virtualubuntu-upgrade-linux-image-virtual-6-8
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