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Review reviewCritical

CVE-2026-53175

Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6

In the Linux kernel, the following vulnerability has been resolved: inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush On netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and flushes every fragment queue that is not yet complete using inet_frag_queue_flush(). That helper frees all the skbs queued on the fragment queue but does not set INET_FRAG_COMPLETE, and leaves q->fragments_tail and q->last_run_head pointing at the freed skbs. The queue itself stays in the rhashtable. fqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups, but it cannot sto...

CVSS
9.8
EPSS
0.31%
23.7% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.31%
Technical severityCVSS 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush On netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and flushes every fragment queue that is not yet complete using inet_frag_queue_flush(). That helper frees all the skbs queued on the fragment queue but does not set INET_FRAG_COMPLETE, and leaves q->fragments_tail and q->last_run_head pointing at the freed skbs. The queue itself stays in the rhashtable. fqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups, but it cannot sto...

Affected product and versions

Product
Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6
Affected versions
>= 22ee4010866da81aeee08e1ea3fddbe418feb212 < 0e823ca0e7391630784ae7dd0981b7ad170a93d9, >= 543555954b1ee8d1903a7020324efb41b0c97428 < c22599cc90e1cd5f8129c8670bd68a02ff7177b4, >= c70df25214ac9b32b53e18e6ae3b8f073ffa6903 < 89b909e9704587bfecc1aab1d37e98faee03b9f9, >= 006a5035b495dec008805df249f92c22c89c3d2e < 010c3313a4d178dc2d3ce958d2e5cb055e2864c1, >= 006a5035b495dec008805df249f92c22c89c3d2e < 32594b09854970d7ba83eb2dc8c69a2edd158c8e, >= 6.12.93 < 6.12.94, >= 6.18.3 < 6.18.36, >= 6.19, >= 6.19.1 < 7.0.13, 6.12.93, 6.19, 7.1
Fixed versions
6.18.36, 7.0.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 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
CWE-416