Use After Free in Linux

CVE-2023-52983

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for bfqq in bic_set_bfqq() After commit 64dc8c732f5c ("block, bfq: fix possible uaf for 'bfqq->bic'"), bic->bfqq will be accessed in bic_set_bfqq(), however, in some context bic->bfqq will be freed, and bic_set_bfqq() is called with the freed bic->bfqq. Fix the problem by always freeing bfqq after bic_set_bfqq().

Vulnerability class: Use-After-Free

EPSS: 0.003 (17.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Linux — versions 64dc8c732f5c2b406cc752e6aaa1bd5471159cab, 094f3d9314d67691cb21ba091c1b528f6e3c4893, 5533742c7cb1bc9b1f0bf401cc397d44a3a9e07a
  • Linux Linux_kernel — versions 6.0.16

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2023-52983?
CVE-2023-52983 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 7.8/10. Published 2025-03-27.
How severe is CVE-2023-52983?
High severity. CVSS v3 base score is 7.8 out of 10.