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Message-ID: <2026011307-CVE-2025-68799-b0dd@gregkh> Date: Tue, 13 Jan 2026 16:29:25 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-68799: caif: fix integer underflow in cffrml_receive() From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== 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. The Linux kernel CVE team has assigned CVE-2025-68799 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.35 with commit b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and fixed in 6.1.160 with commit 785c7be6361630070790f6235b696da156ac71b3 Issue introduced in 2.6.35 with commit b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and fixed in 6.6.120 with commit f818cd472565f8b0c2c409b040e0121c5cf8592c Issue introduced in 2.6.35 with commit b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and fixed in 6.12.64 with commit 4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3 Issue introduced in 2.6.35 with commit b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and fixed in 6.18.3 with commit 21fdcc00656a60af3c7aae2dea8dd96abd35519c Issue introduced in 2.6.35 with commit b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and fixed in 6.19-rc2 with commit 8a11ff0948b5ad09b71896b7ccc850625f9878d1 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-68799 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/caif/cffrml.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: 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
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