FKIE_CVE-2023-53484
Vulnerability from fkie_nvd - Published: 2025-10-01 12:15 - Updated: 2026-01-20 16:35
Severity ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 3.8 | |
| linux | linux_kernel | 3.8 | |
| linux | linux_kernel | 3.8 | |
| linux | linux_kernel | 3.8 | |
| linux | linux_kernel | 3.8 |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: cpu_rmap: Avoid use after free on rmap-\u003eobj array entries\n\nWhen calling irq_set_affinity_notifier() with NULL at the notify\nargument, it will cause freeing of the glue pointer in the\ncorresponding array entry but will leave the pointer in the array. A\nsubsequent call to free_irq_cpu_rmap() will try to free this entry again\nleading to possible use after free.\n\nFix that by setting NULL to the array entry and checking that we have\nnon-zero at the array entry when iterating over the array in\nfree_irq_cpu_rmap().\n\nThe current code does not suffer from this since there are no cases\nwhere irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the\nnotify arg) is called, followed by a call to free_irq_cpu_rmap() so we\ndon\u0027t hit and issue. Subsequent patches in this series excersize this\nflow, hence the required fix."
}
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"id": "CVE-2023-53484",
"lastModified": "2026-01-20T16:35:24.737",
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"scope": "UNCHANGED",
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"published": "2025-10-01T12:15:51.180",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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