CVE-2025-68799 (GCVE-0-2025-68799)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-01-13 15:29
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 785c7be6361630070790f6235b696da156ac71b3 (git)
Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < f818cd472565f8b0c2c409b040e0121c5cf8592c (git)
Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3 (git)
Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 21fdcc00656a60af3c7aae2dea8dd96abd35519c (git)
Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 8a11ff0948b5ad09b71896b7ccc850625f9878d1 (git)
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    Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "net/caif/cffrml.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif: fix integer underflow in cffrml_receive()\n\nThe cffrml_receive() function extracts a length field from the packet\nheader and, when FCS is disabled, subtracts 2 from this length without\nvalidating that len \u003e= 2.\n\nIf an attacker sends a malicious packet with a length field of 0 or 1\nto an interface with FCS disabled, the subtraction causes an integer\nunderflow.\n\nThis can lead to memory exhaustion and kernel instability, potential\ninformation disclosure if padding contains uninitialized kernel memory.\n\nFix this by validating that len \u003e= 2 before performing the subtraction."
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        "shortName": "Linux"
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    "dateReserved": "2025-12-24T10:30:51.042Z",
    "dateUpdated": "2026-01-13T15:29:09.012Z",
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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