CVE-2023-53254

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However, this will trigger\nslab-out-of-bounds access if the CPUs do not have the same cache hierarchy.\nAnother problem is the mismatched shared_cpu_map when the shared cache does\nnot have the same index between CPUs.\n\nCPU0\tI\tD\tL3\nindex\t0\t1\t2\tx\n\t^\t^\t^\t^\nindex\t0\t1\t2\t3\nCPU1\tI\tD\tL2\tL3\n\nThis patch checks each cache is shared with all caches on other CPUs."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The OOB occurs in cache_shared_cpu_map_setup/remove during local CPU bring-up (cacheinfo_cpu_online, update_siblings_masks/store_cpu_topology, and CPU offline cleanup), not via network packet processing or adjacent-link protocols.\nAC:L - On systems with asymmetric per-CPU cache hierarchies (the SiFive/heterogeneous topology described in the fix), indexing a sibling's smaller info_list with the current CPU's leaf index deterministically causes the slab OOB whenever that CPU comes online; no race or attacker-uncontrollable timing is required.\nPR:L - The OOB runs automatically during normal boot SMP bring-up and kernel-driven CPU hotplug on affected hardware, so a local unprivileged user can be present to leverage the resulting slab corruption without needing to write /sys/devices/system/cpu/*/online as real root.\nUI:N - CPU online/offline and early topology setup invoke the vulnerable path as part of normal kernel operation; no separate victim action such as mounting a filesystem or opening a device is required.\nS:U - The slab out-of-bounds access corrupts kernel heap within the host kernel's security authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - per_cpu_cacheinfo_idx() performs an unbounded slab out-of-bounds read of a full struct cacheinfo from adjacent heap when cache_leaves differ, which per guidance is Confidentiality High rather than a small bounded leak.\nI:H - If cache_leaves_are_shared() accepts the OOB leaf (or on remove after a sibling was recorded), cpumask_set_cpu/cpumask_clear_cpu writes into sib_leaf->shared_cpu_map past the allocated info_list, yielding a heap out-of-bounds write exploitable for integrity compromise.\nA:H - The slab out-of-bounds access can oops/panic the kernel when it hits unmapped or poisoned memory adjacent to the undersized info_list allocation, which is Availability High."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/base/cacheinfo.c"], "versions": [{"version": "246246cbde5e840012f853e27630ebb59f409486", "lessThan": "2f588d0345d69a35e451077afed428fd057a5e34", "status": "affected", "versionType": "git"}, {"version": "246246cbde5e840012f853e27630ebb59f409486", "lessThan": "dea49f2993f57d8a2df2cacb0bf649ef49b28879", "status": "affected", "versionType": "git"}, {"version": "246246cbde5e840012f853e27630ebb59f409486", "lessThan": "198102c9103fc78d8478495971947af77edb05c1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/base/cacheinfo.c"], "versions": [{"version": "3.19", "status": "affected"}, {"version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.18", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.5", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2f588d0345d69a35e451077afed428fd057a5e34"}, {"url": "https://git.kernel.org/stable/c/dea49f2993f57d8a2df2cacb0bf649ef49b28879"}, {"url": "https://git.kernel.org/stable/c/198102c9103fc78d8478495971947af77edb05c1"}], "title": "cacheinfo: Fix shared_cpu_map to handle shared caches at different levels", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2023-53254", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T18:01:14.729698Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:02:52.518Z"}}]}}

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{"created": "2025-09-17T10:07:41.253781+00:00", "updated": "2025-09-17T10:07:41.253843+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}