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Review reviewHigh

CVE-2026-63831

Linux

In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: add skb_cow_data() before in-place crypto llsec_do_encrypt_unauth(), llsec_do_encrypt_auth(), llsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform in-place cryptographic transformations on skb data. They build a scatterlist with sg_init_one() pointing into the skb's linear data area and then pass the same scatterlist as both src and dst to the crypto API (e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt). On the RX path, __ieee802154_rx_handle_packet() clones the received skb...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: add skb_cow_data() before in-place crypto llsec_do_encrypt_unauth(), llsec_do_encrypt_auth(), llsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform in-place cryptographic transformations on skb data. They build a scatterlist with sg_init_one() pointing into the skb's linear data area and then pass the same scatterlist as both src and dst to the crypto API (e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt). On the RX path, __ieee802154_rx_handle_packet() clones the received skb...

Affected product and versions

Product
Linux
Affected versions
>= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < 3a2b378b3a9ca75d3518d879148d2ad25b5714a9, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < 7a831bcd0486788283ef35e396d4282ee01bb0d5, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < ff976ef7c39199ebff33c18034636595016db9f0, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < e28e7fd34c449028325322a3f5127b92594b7396, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < 993fd674fe85d114e6a8d3963033d4fbbc2170a8, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < bd968bdd568beacfdf98ec537a87527e85f1d0cf, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < 86d531337ea1ba02d9f2bc830d07c683d9bfaade, >= 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 < 84a04eb5b210643bd67aab81ff805d32f62aa865, >= 3.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available