PT-2026-61147 · Linux · Linux Kernel

CVE-2026-63831 · Published 2026-07-19 · Updated 2026-07-19

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description In the mac802154 llsec module, the functions llsec do encrypt unauth(), llsec do encrypt auth(), llsec do decrypt unauth(), and llsec do decrypt auth() perform in-place cryptographic transformations on socket buffer (skb) data. When an skb is cloned, multiple references share the same underlying data buffer. Modifying this shared buffer in place leads to silent data corruption of other skb clones. Additionally, this can cause use-after-free conditions when the crypto API writes to a page already freed by another clone, potentially resulting in kernel crashes during concurrent 802.15.4 traffic with security enabled.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-63831

Affected Products

Linux Kernel

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2026-63831 · Security Note
• https://git.kernel.org/stable/c/bd968bdd568beacfdf98ec537a87527e85f1d0cf · Note
• https://git.kernel.org/stable/c/e28e7fd34c449028325322a3f5127b92594b7396 · Note
• https://git.kernel.org/stable/c/7a831bcd0486788283ef35e396d4282ee01bb0d5 · Note
• https://git.kernel.org/stable/c/ff976ef7c39199ebff33c18034636595016db9f0 · Note
• https://git.kernel.org/stable/c/84a04eb5b210643bd67aab81ff805d32f62aa865 · Note
• https://git.kernel.org/stable/c/3a2b378b3a9ca75d3518d879148d2ad25b5714a9 · Note
• https://twitter.com/vuldb/status/2078924262312947737 · Twitter Post
• https://git.kernel.org/stable/c/86d531337ea1ba02d9f2bc830d07c683d9bfaade · Note
• https://git.kernel.org/stable/c/993fd674fe85d114e6a8d3963033d4fbbc2170a8 · Note
• https://twitter.com/VulmonFeeds/status/2078843368625393806 · Twitter Post