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ReviewCritical

CVE-2026-74628

Linux

In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free of the socket by its timers The x25 timers are armed with mod_timer() and cancelled with timer_delete(), so a pending timer holds no reference on the socket and a cancel does not wait for a callback already running on another CPU. x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall sk->sk_timer after __x25_destroy_socket() has passed its cancel point. The following __sock_put() frees the socket while the timer is still queued, and the next expiry uses freed memory. KASAN repor...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.23
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free of the socket by its timers The x25 timers are armed with mod_timer() and cancelled with timer_delete(), so a pending timer holds no reference on the socket and a cancel does not wait for a callback already running on another CPU. x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall sk->sk_timer after __x25_destroy_socket() has passed its cancel point. The following __sock_put() frees the socket while the timer is still queued, and the next expiry uses freed memory. KASAN repor...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ba925a2e98ce967a0e71c5bcbcf5dbd3facaf0c8, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6b79659590f0f82a9b8efd2ffd55ec6399ebfc33, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fdd9ac50b9b61ef2b2d52c5156aff788be91454d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1fc9f6d2c7c9fdb341bfe8ca449c990632299ea6, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3c4919be5d910db4beebca420953858606fba7d8, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4bc522b33438fefc3272840ae5988771863a4f1f, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e92c7e2b41d1528a830bc64c5e4e46dfa8133dda, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2195424c3da2ef1829a63b807e3a900a90e57d85, >= 2.6.12
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available