CVE-2025-68799

Memory exhaustion via CAIF length underflow

Published Jan 13, 2026 · Updated Jan 13, 2026

Integer underflow in affected Linux Kernel builds allows attackers to exhaust memory or expose kernel data via a malformed CAIF packet. cffrml_receive() subtracts two from a packet-supplied length without checking for values below two, producing an oversized padding calculation. The packet must reach a CAIF interface with FCS disabled; resulting padding growth can destabilize the kernel and expose uninitialized kernel memory.

CVSS severity8.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in affected Linux Kernel builds allows attackers to exhaust memory or expose kernel data via a malformed CAIF packet. cffrml_receive() subtracts two from a packet-supplied length without checking for values below two, producing an oversized padding calculation. The packet must reach a CAIF interface with FCS disabled; resulting padding growth can destabilize the kernel and expose uninitialized kernel memory.

The record

CVE
CVE-2025-68799
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.35
  2. Affected versionversion=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <21fdcc00656a60af3c7aae2dea8dd96abd35519c
  3. Affected versionversion=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3
  4. Affected versionversion=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <785c7be6361630070790f6235b696da156ac71b3
  5. Affected versionversion=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <8a11ff0948b5ad09b71896b7ccc850625f9878d1
  6. Affected versionversion=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <f818cd472565f8b0c2c409b040e0121c5cf8592c

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.35; version=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <21fdcc00656a60af3c7aae2dea8dd96abd35519c; version=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3; version=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <785c7be6361630070790f6235b696da156ac71b3; version=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <8a11ff0948b5ad09b71896b7ccc850625f9878d1; version=b482cd2053e3b90a7b33a78c63cdb6badf2ec383 <f818cd472565f8b0c2c409b040e0121c5cf8592c

Published CVSS scores

8.1kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
6.9SUSECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
6.5SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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