VYPR
Unrated severityNVD Advisory· Published May 9, 2025· Updated Jan 2, 2026

9p/net: fix improper handling of bogus negative read/write replies

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)

Affected products

89

Patches

Vulnerability mechanics

References

5

News mentions

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