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Review reviewHigh

CVE-2022-50329

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().

CVSS
7.8
EPSS
0.15%
5.07% percentile
CISA KEV
Not listed
Published
2025.09.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.15%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bfq_exit_icq_bfqq Commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'") will access 'bic->bfqq' in bic_set_bfqq(), however, bfq_exit_icq_bfqq() can free bfqq first, and then call bic_set_bfqq(), which will cause uaf. Fix the problem by moving bfq_exit_bfqq() behind bic_set_bfqq().

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a < 1425f1bb5df5239021fd09ebc2a5e8070e705d36, >= 094f3d9314d67691cb21ba091c1b528f6e3c4893 < 7949b0df3dd9f4817ed4a4e989fa9ee81df6205f, >= b22fd72bfebda3956efc4431b60ddfc0a51e03e0 < cfe5b38c37720313eff0dec5517442c7ab3c9a20, >= 761564d93c8265f65543acf0a576b32d66bfa26a < 1ed959fef5b1c6f1a7a3fbea543698c30ebd6678, >= 64dc8c732f5c2b406cc752e6aaa1bd5471159cab < 246cf66e300b76099b5dbd3fdd39e9a5dbc53f02, >= 5.15.86 < 5.15.87, >= 6.0.16 < 6.0.17, >= 6.1.2 < 6.1.3, 5.15.86, 6.0.16, 6.1.2, 6.2
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 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-2022-50329 — Linux Linux, linux kernel | SECUFOCUS NOW