CVE-2026-68125: Linux Vulnerability (CVSS 8.8)

Description

In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: reject frames shorter than the authentication tag llsec_do_decrypt_auth() computes the associated-data length for the AEAD request as assoclen += datalen - authlen; where datalen is the number of bytes after the MAC header and authlen (4, 8 or 16) is the length of the authentication tag. Nothing verifies that the frame actually carries at least authlen payload bytes. A secured frame whose payload is shorter than the tag makes datalen - authlen negative; assoclen is then passed to aead_request_set_ad() as an unsigned value close to 4 GiB, so crypto_aead_decrypt() walks far off the end of the scatterlist that only spans the real frame. The frame is fully attacker-controlled and reaches this path from any IEEE 802.15.4 peer in radio range. Reject frames whose payload is shorter than the authentication tag before the subtraction. Dynamically reproduced on a KASAN kernel as a general-protection-fault in the AEAD scatterwalk, and the fix confirmed.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.31%

23.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < f27ce82eb04960465df71634b196a48a4ecafd50; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < 2d6b42a61373144298070668fddf06efe79cf2ff; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < ec7e62d77193131227df49d654d118fdf5a59892; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < 5bbf0cd9b6a7076af86c75e87e180099be2e11ae; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < de80808f37d99c6dc67bb6f97eea00c8f57a8821; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < f20dedce0429b293d4bad604e0d3f65d8ac96c83; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < e09e0301d616c1ef38a5e64e8e4326fd39df13cc; >= 4c14a2fb5d143e4ed94143be2b8c1961b47df9af, < fd3a3f28ed60c6af4b2a39933b151d6b27842c3b
Linux	Linux	3.16

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 19, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68125?

In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: reject frames shorter than the authentication tag llsec_do_decrypt_auth() computes the associated-data length for the AEAD request as assoclen += datalen - authlen; where datalen is the number of bytes after the MAC header and authlen (4, 8 or 16) is the length of the authentication tag. Nothing verifies that the frame actually carries at least authlen payload bytes. A secured frame whose payload is shorter than the tag makes datalen - authlen negative; assoclen is then passed to aead_request_set_ad() as an unsigned value close to 4 GiB, so crypto_aead_decrypt() walks far off the end of the scatterlist that only spans the real frame. The frame is fully attacker-controlled and reaches this path from any IEEE 802.15.4 peer in radio range. Reject frames whose payload is shorter than the authentication tag before the subtraction. Dynamically reproduced on a KASAN kernel as a general-protection-fault in the AEAD scatterwalk, and the fix confirmed.

How severe is CVE-2026-68125?

CVE-2026-68125 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-68125?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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