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Review reviewHigh

CVE-2024-53206

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix use-after-free of nreq in reqsk_timer_handler(). The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with __inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler(). Then, oreq should be passed to reqsk_put() instead of req; otherwise use-after-free of nreq could happen when reqsk is migrated but the retry attempt failed (e.g. due to timeout). Let's pass oreq to reqsk_put().

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.12.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix use-after-free of nreq in reqsk_timer_handler(). The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with __inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler(). Then, oreq should be passed to reqsk_put() instead of req; otherwise use-after-free of nreq could happen when reqsk is migrated but the retry attempt failed (e.g. due to timeout). Let's pass oreq to reqsk_put().

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 8459d61fbf24967839a70235165673148c7c7f17 < 2dcc86fefe09ac853158afd96b60d544af115dc5, >= 5071beb59ee416e8ab456ac8647a4dabcda823b1 < 9a3c1ad93e6fba67b3a637cfa95a57a6685e4908, >= 997ae8da14f1639ce6fb66a063dab54031cd61b3 < 65ed89cad1f57034c256b016e89e8c0a4ec7c65b, >= 51e34db64f4e43c7b055ccf881b7f3e0c31bb26d < d0eb14cb8c08b00c36a3d5dc57a6f428b301f721, >= e8c526f2bdf1845bedaf6a478816a3d06fa78b8f < 6d845028609a4af0ad66f499ee0bd5789122b067, >= e8c526f2bdf1845bedaf6a478816a3d06fa78b8f < c31e72d021db2714df03df6c42855a1db592716c, >= 106e457953315e476b3642ef24be25ed862aaba3, >= c964bf65f80a14288d767023a1b300b30f5b9cd0, >= 5.15.170 < 5.15.174, >= 6.1.115 < 6.1.120, >= 6.6.59 < 6.6.64, >= 6.11.6 < 6.11.11, >= 5.4.293 < 5.5, >= 5.10.237 < 5.11, >= 6.12, >= 6.12 < 6.12.2
Fixed versions
5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416
CVE-2024-53206 — Linux Linux, linux kernel | SECUFOCUS NOW