CVE-2023-54088

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No network-facing code path touches q->blkg_list.\nAC:L - The attacker drives both sides of the race: cgroup rmdir plus prior I/O queues many blkg_free_workfn() instances that do the unlocked list_del_init(&blkg->q_node), while a concurrent io.latency write (blk_iolatency_init -> blkcg_activate_policy) or disk teardown (blkg_destroy_all) walks q->blkg_list under queue_lock only. The window can be widened arbitrarily by creating thousands of blkgs and freeing them in bulk, and pd_free_fn() work inside the mutex lengthens it further.\nPR:L - An unprivileged local user suffices in the standard deployment where a cgroup v2 subtree is delegated (systemd user@.service, rootless containers): the user owns the io.* files in cgroups they create, so they can create/destroy blkgs and trigger policy activation. No real root or CAP_SYS_ADMIN in the init namespace is needed.\nUI:N - The race is triggered entirely by the attacker's own processes issuing I/O and manipulating their cgroups; no victim action is required.\nS:U - Corruption stays within the kernel's own security authority \u2014 this is a standard kernel memory-corruption/privilege-escalation primitive with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The unsynchronized list_del_init() lets list_for_each_entry_safe() in blkg_destroy_all() and the walkers in blkcg_activate_policy() follow stale next pointers into a blkcg_gq that blkg_free_workfn() then kfree()s, so the kernel reads and dereferences attacker-sprayable reclaimed slab contents \u2014 a use-after-free read that yields an arbitrary kernel-memory disclosure primitive.\nI:H - After the list is corrupted the kernel writes through the dangling entry: blkg->pd[pol->plid] = pd, pd->online = false, radix_tree_delete(), hlist_del_init_rcu(), rcu_assign_pointer(blkcg->blkg_hint, NULL) and percpu_ref_kill() all operate on freed/reallocated memory, giving controlled pointer writes and indirect calls suitable for privilege escalation.\nA:H - The commit message states that list corruption and hard lockup are directly triggerable from blkg_destroy_all(); a corrupted doubly-linked list walked under spin_lock_irq loops forever or oopses, panicking the machine."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/blk-cgroup.c"], "versions": [{"version": "81c1188905f88b77743d1fdeeedfc8cb7b67787d", "lessThan": "b5dae1cd0d8368b4338430ff93403df67f0b8bcc", "status": "affected", "versionType": "git"}, {"version": "bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a", "lessThan": "083b58373463a6e5ee60ecb135269348f68ad7df", "status": "affected", "versionType": "git"}, {"version": "f1c006f1c6850c14040f8337753a63119bba39b9", "lessThan": "cd4ffdf56791eec95af01f06bee1ec7665ca75c4", "status": "affected", "versionType": "git"}, {"version": "f1c006f1c6850c14040f8337753a63119bba39b9", "lessThan": "c164c7bc9775be7bcc68754bb3431fce5823822e", "status": "affected", "versionType": "git"}, {"version": "6.1.16", "lessThan": "6.1.17", "status": "affected", "versionType": "semver"}, {"version": "6.2.3", "lessThan": "6.2.4", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/blk-cgroup.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.17", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.2.4", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.12", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5", "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": "6.1.16", "versionEndExcluding": "6.1.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.3", "versionEndExcluding": "6.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.4.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc"}, {"url": "https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df"}, {"url": "https://git.kernel.org/stable/c/cd4ffdf56791eec95af01f06bee1ec7665ca75c4"}, {"url": "https://git.kernel.org/stable/c/c164c7bc9775be7bcc68754bb3431fce5823822e"}], "title": "blk-cgroup: hold queue_lock when removing blkg->q_node", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-54088", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:38:17.912163Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:39.244Z"}}]}}

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No network-facing code path touches q->blkg_list.\nAC:L - The attacker drives both sides of the race: cgroup rmdir plus prior I/O queues many blkg_free_workfn() instances that do the unlocked list_del_init(&blkg->q_node), while a concurrent io.latency write (blk_iolatency_init -> blkcg_activate_policy) or disk teardown (blkg_destroy_all) walks q->blkg_list under queue_lock only. The window can be widened arbitrarily by creating thousands of blkgs and freeing them in bulk, and pd_free_fn() work inside the mutex lengthens it further.\nPR:L - An unprivileged local user suffices in the standard deployment where a cgroup v2 subtree is delegated (systemd user@.service, rootless containers): the user owns the io.* files in cgroups they create, so they can create/destroy blkgs and trigger policy activation. No real root or CAP_SYS_ADMIN in the init namespace is needed.\nUI:N - The race is triggered entirely by the attacker's own processes issuing I/O and manipulating their cgroups; no victim action is required.\nS:U - Corruption stays within the kernel's own security authority \u2014 this is a standard kernel memory-corruption/privilege-escalation primitive with no crossing of a VM, IOMMU, or hypervisor boundary.\nC:H - The unsynchronized list_del_init() lets list_for_each_entry_safe() in blkg_destroy_all() and the walkers in blkcg_activate_policy() follow stale next pointers into a blkcg_gq that blkg_free_workfn() then kfree()s, so the kernel reads and dereferences attacker-sprayable reclaimed slab contents \u2014 a use-after-free read that yields an arbitrary kernel-memory disclosure primitive.\nI:H - After the list is corrupted the kernel writes through the dangling entry: blkg->pd[pol->plid] = pd, pd->online = false, radix_tree_delete(), hlist_del_init_rcu(), rcu_assign_pointer(blkcg->blkg_hint, NULL) and percpu_ref_kill() all operate on freed/reallocated memory, giving controlled pointer writes and indirect calls suitable for privilege escalation.\nA:H - The commit message states that list corruption and hard lockup are directly triggerable from blkg_destroy_all(); 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{"bugzilla": {"description": "kernel: blk-cgroup: hold queue_lock when removing blkg->q_node", "id": "2425095", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2425095"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-54088", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-54088\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-54088\nhttps://lore.kernel.org/linux-cve-announce/2025122406-CVE-2023-54088-f00f@gregkh/T"], "threat_severity": "Low"}

{}