CVE-2025-68799

Summary

In the Linux kernel, the following vulnerability has been resolved:

caif: fix integer underflow in cffrml_receive()

The cffrml_receive() function extracts a length field from the packet header and, when FCS is disabled, subtracts 2 from this length without validating that len >= 2.

If an attacker sends a malicious packet with a length field of 0 or 1 to an interface with FCS disabled, the subtraction causes an integer underflow.

This can lead to memory exhaustion and kernel instability, potential information disclosure if padding contains uninitialized kernel memory.

Fix this by validating that len >= 2 before performing the subtraction.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691affected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < c54091eec6fed19e94182aa05dd6846600a642f7affected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < 785c7be6361630070790f6235b696da156ac71b3affected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < f818cd472565f8b0c2c409b040e0121c5cf8592caffected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < 4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3affected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < 21fdcc00656a60af3c7aae2dea8dd96abd35519caffected
LinuxLinuxb482cd2053e3b90a7b33a78c63cdb6badf2ec383 < 8a11ff0948b5ad09b71896b7ccc850625f9878d1affected
LinuxLinux2.6.35affected
LinuxLinux0 < 2.6.35unaffected
LinuxLinux5.10.248 <= 5.10.*unaffected
LinuxLinux5.15.198 <= 5.15.*unaffected
LinuxLinux6.1.160 <= 6.1.*unaffected
LinuxLinux6.6.120 <= 6.6.*unaffected
LinuxLinux6.12.64 <= 6.12.*unaffected
LinuxLinux6.18.3 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References