caif: fix integer underflow in cffrml_receive()
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.248, 5.15.198, 6.1.160, 6.12.64, 6.18.3, 6.6.120
- CVEs
- CVE-2025-68799
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 18:25 UTC · Revision 1
Source evidence
caif: fix integer underflow in cffrml_receive()
core-osv · Original sourcePublished 13 Jan 2026, 15:29 UTC
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.
osv:CVE-2025-68799
Kernel
Fixed versions: 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3
Complete source record
{
"id": "48ee1c376c8fc886ef182cabc5d99c8c82ebabfe56d9b6da1393cf39f8bf4515",
"url": "https://osv.dev/vulnerability/CVE-2025-68799",
"method": "structured",
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"title": "caif: fix integer underflow in cffrml_receive()",
"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.",
"evidence": "osv:CVE-2025-68799",
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"modified": "2026-10-28T02:30:22.004465543Z",
"provider": "osv",
"references": [
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68799.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-68799",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"provider_metadata": {
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"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 488323,
"published_at": "2026-01-13T15:29:09.012+00:00"
}