CVE-2025-37879

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < 468ff4a7c61fb811c596a7c44b6a5455e40fd12baffected
LinuxLinux070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < a68768e280b7d0c967ea509e791bb9b90adc94a5affected
LinuxLinux070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < c548f95688e2b5ae0e2ae43d53cf717156c7d034affected
LinuxLinux070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < 374e4cd75617c8c2552f562f39dd989583f5c330affected
LinuxLinux070b3656cf228eaaef7b28b59264c5c7cdbdd0fb < d0259a856afca31d699b706ed5e2adf11086c73baffected
LinuxLinux4.1affected
LinuxLinux0 < 4.1unaffected
LinuxLinux6.1.136 <= 6.1.*unaffected
LinuxLinux6.6.89 <= 6.6.*unaffected
LinuxLinux6.12.26 <= 6.12.*unaffected
LinuxLinux6.14.5 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References