CVE-2025-37879
Critical
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)
SeverityCritical
CVSS9.8
Exploit probability—
Product
Linux Kernel
PublishedMay 9, 2025
First seenMay 9, 2025
How to fix
Update
- linux linux_kernel6.1.136, 6.6.89, 6.12.26, 6.14.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 6.1.136, 6.2 ≤ v < 6.6.89, 6.7 ≤ v < 6.12.26, 6.13 ≤ v < 6.14.5 | 6.1.136, 6.6.89, 6.12.26, 6.14.5 |
| debian debian_linux | 11.0 | — |
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