7.8

CVE-2023-53484: lib: cpu_rmap: Avoid use after free on rmap->obj array entries

Modified
AliasesUBUNTU-CVE-2023-53484DEBIAN-CVE-2023-53484
Published 01-10-2025Last modified 15-10-2026

Vulnerability summary

CVE-2023-53484 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
SUSE-SU-2025:4189-1

Timeline

  1. 01-10-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: lib: cpu_rmap: Avoid use after free on rmap->obj array entries When calling irq_set_affinity_notifier() with NULL at the notify argument, it will cause freeing of the glue pointer in the corresponding array entry but will leave the pointer in the array. A subsequent call to free_irq_cpu_rmap() will try to free this entry again leading to possible use after free. Fix that by setting NULL to the array entry and checking that we have non-zero at the array entry when iterating over the array in free_irq_cpu_rmap(). The current code does not suffer from this since there are no cases where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the notify arg) is called, followed by a call to free_irq_cpu_rmap() so we don't hit and issue. Subsequent patches in this series excersize this flow, hence the required fix.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu123 products
  • linuxAll versions (No fix recorded) | < 5.4.0-162.179 | < 5.15.0-83.92
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1109.118 | < 5.15.0-1044.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < 981f339d2905b6a92ef59358158b326493aecac5 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < d1308bd0b24cb1d78fa2747d5fa3e055cc628a48 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < f748e15253833b771acbede14ea98f50831ac289 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < c6ed54dd90698dc0744d669524cc1c122ded8a16 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4 | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < 67bca5f1d644f4e79b694abd8052a177de81c37f | ≥ 896f97ea95c1d29c0520ee0766b66b7f64cb967c, < 4e0473f1060aa49621d40a113afde24818101d37 | 3.8
  • linux_kernel≥ 3.8.1, < 4.14.316 | ≥ 4.15, < 4.19.284 | ≥ 4.20, < 5.4.244 | ≥ 5.5, < 5.10.181 | ≥ 5.11, < 5.15.113 | ≥ 5.16, < 6.1.30 | ≥ 6.2, < 6.3.4 | 3.8 | 3.8:rc4 | 3.8:rc5 | 3.8:rc6 | 3.8:rc7
Debian1 product
  • linux< 6.1.37-1 | < 6.3.7-1

3 vendors · 126 products

References

12 links
Show all 12 references