# CVE-2023-53484: linux: In the Linux kernel, the following vulnerability has been resolved: lib: cpu_rmap: Avoid use after free on rmap->obj... CVE-2023-53484 is fixed in 20 products on 1 platform, first by ALAS2023-2023-228, released June 21, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-53484 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0016 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 21, 2023 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-headers amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-livepatch-6.1.34-56.100 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-53484](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53484.md) | Oct 1, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53484](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53484.md) | Oct 1, 2025 | | Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53484](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53484.md) | Oct 1, 2025 | | Linux | perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | --- Data as of 2026-11-09T07:25:28Z UTC. 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