High 8.1Published Jan 13, 2026

CVE-2025-68799caif: fix integer underflow in cffrml_receive()

Updated under an hour ago (Oct 27, 2026, 10:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before c54091eec6fed19e94182aa05dd6846600a642f7; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before 785c7be6361630070790f6235b696da156ac71b3; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before f818cd472565f8b0c2c409b040e0121c5cf8592c; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before 4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before 21fdcc00656a60af3c7aae2dea8dd96abd35519c; from b482cd2053e3b90a7b33a78c63cdb6badf2ec383 before 8a11ff0948b5ad09b71896b7ccc850625f9878d1	CNA record

References

References

https://git.kernel.org/stable/c/f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691
https://git.kernel.org/stable/c/c54091eec6fed19e94182aa05dd6846600a642f7
https://git.kernel.org/stable/c/785c7be6361630070790f6235b696da156ac71b3
https://git.kernel.org/stable/c/f818cd472565f8b0c2c409b040e0121c5cf8592c
https://git.kernel.org/stable/c/4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3
https://git.kernel.org/stable/c/21fdcc00656a60af3c7aae2dea8dd96abd35519c
https://git.kernel.org/stable/c/8a11ff0948b5ad09b71896b7ccc850625f9878d1

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.