CVE-2025-37879
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)
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | - | 6.1.136 |
| linux / linux_kernel | 6.2 | 6.6.89 |
| linux / linux_kernel | 6.7 | 6.12.26 |
| linux / linux_kernel | 6.13 | 6.14.5 |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/374e4cd75617c8c2552f562f39dd989583f5c330
- https://git.kernel.org/stable/c/468ff4a7c61fb811c596a7c44b6a5455e40fd12b
- https://git.kernel.org/stable/c/a68768e280b7d0c967ea509e791bb9b90adc94a5
- https://git.kernel.org/stable/c/c548f95688e2b5ae0e2ae43d53cf717156c7d034
- https://git.kernel.org/stable/c/d0259a856afca31d699b706ed5e2adf11086c73b
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
Deep Security Visibility Without the Complexity
SynScan provides clear, real-time security insights so you can monitor your attack surface, spot risks early, and act fast—without extra complexity.
- No setup fees
- 5-min deployment
- Cancel anytime