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CVE-2023-53484 (GCVE-0-2023-53484)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:42 – Updated: 2026-08-05 09:14
VLAI
Title
lib: cpu_rmap: Avoid use after free on rmap->obj array entries
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < 981f339d2905b6a92ef59358158b326493aecac5 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < d1308bd0b24cb1d78fa2747d5fa3e055cc628a48 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < f748e15253833b771acbede14ea98f50831ac289 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < c6ed54dd90698dc0744d669524cc1c122ded8a16 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4 (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < 67bca5f1d644f4e79b694abd8052a177de81c37f (git)
Affected: 896f97ea95c1d29c0520ee0766b66b7f64cb967c , < 4e0473f1060aa49621d40a113afde24818101d37 (git)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 4.14.316 , ≤ 4.14.* (semver)
Unaffected: 4.19.284 , ≤ 4.19.* (semver)
Unaffected: 5.4.244 , ≤ 5.4.* (semver)
Unaffected: 5.10.181 , ≤ 5.10.* (semver)
Unaffected: 5.15.113 , ≤ 5.15.* (semver)
Unaffected: 6.1.30 , ≤ 6.1.* (semver)
Unaffected: 6.3.4 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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{
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              "value": "AV:L - The vulnerable code is reached only through local device-configuration and teardown paths (`ethtool -L`/set-channels, interface down, devlink SF/VF teardown, driver unbind) that drive `irq_cpu_rmap_remove()` and `free_irq_cpu_rmap()`. No remote packet or protocol data reaches `lib/cpu_rmap.c`; the RFS receive path only reads `rmap-\u003enear[]`, not the freed glue objects.\nAC:L - The use-after-free is deterministic and requires no race \u2014 releasing an IRQ vector leaves a stale `rmap-\u003eobj[]` entry that the subsequent `free_irq_cpu_rmap()` walk unconditionally dereferences, and the attacker fully controls the ordering and timing of both steps. `CONFIG_RFS_ACCEL` is `default y` (depends on `RPS`), so the required configuration is the norm on distro kernels, and the unbounded window between free and walk lets the attacker reliably groom the `kmalloc-64` slab.\nPR:L - Triggering requires CAP_NET_ADMIN over the affected netdev (ethtool set-channels, link down, devlink SF removal), which per kernel-CNA guidance scores as Low rather than High. In common SR-IOV/container deployments an mlx5 VF netdev is delegated into a network namespace owned by a user namespace, giving an otherwise unprivileged container-local user exactly this capability over the device.\nUI:N - No victim action is needed; the attacker performs both the IRQ-vector release and the subsequent rmap teardown entirely on their own via device reconfiguration.\nS:U - The freed object, the corrupted state, and the resulting impact are all within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free on a `kmalloc-64` GFP_KERNEL object with an attacker-paced reclaim window, so the freed `struct irq_glue` can be reoccupied with sprayed data; the attacker-controlled `notify.irq` then selects an arbitrary `irq_desc`, and the resulting refcount underflow and indirect `-\u003erelease` call chain can be leveraged into arbitrary kernel memory disclosure.\nI:H - After reclaiming the freed glue, `irq_set_affinity_notifier(glue-\u003enotify.irq, NULL)` performs an arbitrary IRQ-descriptor lookup and issues spurious `kref_put(\u0026old_notify-\u003ekref, old_notify-\u003erelease)` calls on a live notifier, producing refcount underflow, premature free, and an indirect call through a function pointer \u2014 a control-flow hijack primitive rather than a mere crash.\nA:H - Even unweaponized, dereferencing the freed glue and passing garbage to `irq_set_affinity_notifier()` corrupts unrelated IRQ descriptor state and oopses/panics the kernel during device teardown, and the double kref_put can prematurely free the cpu_rmap itself."
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"lib/cpu_rmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"981f339d2905b6a92ef59358158b326493aecac5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"d1308bd0b24cb1d78fa2747d5fa3e055cc628a48\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"f748e15253833b771acbede14ea98f50831ac289\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"c6ed54dd90698dc0744d669524cc1c122ded8a16\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"67bca5f1d644f4e79b694abd8052a177de81c37f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"896f97ea95c1d29c0520ee0766b66b7f64cb967c\",\"lessThan\":\"4e0473f1060aa49621d40a113afde24818101d37\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"lib/cpu_rmap.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.316\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.284\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.244\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.181\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.113\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.30\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.4\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.8.1\",\"versionEndExcluding\":\"4.14.316\",\"matchCriteriaId\":\"B7A02E65-365A-4781-BA03-7D649C1BCED3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.284\",\"matchCriteriaId\":\"9112EE64-11F4-46DB-A041-95118F20F81B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.244\",\"matchCriteriaId\":\"79F47095-8BA3-495A-AED3-2CCA5F2838E6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.181\",\"matchCriteriaId\":\"F5B1726B-45AA-47F2-9261-6DC963E92248\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:20:00+00:00",
      "cve": "CVE-2023-53484",
      "id": "CVE-2023-53484",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lib: cpu_rmap: Avoid use after free on rmap-\u003eobj array entries",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53484.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:58:29Z",
      "cve": "CVE-2023-53484",
      "id": "CVE-2023-53484",
      "initial_release_date": "2025-10-01T23:30:23Z",
      "product_status:known_affected": "724",
      "product_status:known_not_affected": "170",
      "product_status:recommended": "37",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53484",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53484.json",
      "version": "25"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.