226 lines
12 KiB
JSON
226 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-54088",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-12-24T13:02:52.515Z",
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"datePublished": "2025-12-24T13:06:18.216Z",
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"dateUpdated": "2026-10-15T21:41:39.244Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:17:07.550Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: hold queue_lock when removing blkg->q_node\n\nWhen blkg is removed from q->blkg_list from blkg_free_workfn(), queue_lock\nhas to be held, otherwise, all kinds of bugs(list corruption, hard lockup,\n..) can be triggered from blkg_destroy_all()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is in the block cgroup layer (block/blk-cgroup.c) and is reached only through local operations — cgroup v2 mkdir/rmdir, block I/O to a device, and writes to io.* cgroup control files or disk teardown. 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 — 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 — 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"block/blk-cgroup.c"
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],
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"versions": [
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{
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"version": "81c1188905f88b77743d1fdeeedfc8cb7b67787d",
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"lessThan": "b5dae1cd0d8368b4338430ff93403df67f0b8bcc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a",
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"lessThan": "083b58373463a6e5ee60ecb135269348f68ad7df",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f1c006f1c6850c14040f8337753a63119bba39b9",
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"lessThan": "cd4ffdf56791eec95af01f06bee1ec7665ca75c4",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f1c006f1c6850c14040f8337753a63119bba39b9",
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"lessThan": "c164c7bc9775be7bcc68754bb3431fce5823822e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.16",
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"lessThan": "6.1.17",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.2.3",
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"lessThan": "6.2.4",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"block/blk-cgroup.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.17",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.2.4",
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"lessThanOrEqual": "6.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.4.12",
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"lessThanOrEqual": "6.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.16",
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"versionEndExcluding": "6.1.17"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2.3",
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"versionEndExcluding": "6.2.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.4.12"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.3",
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"versionEndExcluding": "6.5"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc"
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},
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{
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"url": "https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df"
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},
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{
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"url": "https://git.kernel.org/stable/c/cd4ffdf56791eec95af01f06bee1ec7665ca75c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/c164c7bc9775be7bcc68754bb3431fce5823822e"
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}
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],
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"title": "blk-cgroup: hold queue_lock when removing blkg->q_node",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-54088",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:38:17.912163Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:41:39.244Z"
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}
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}
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]
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}
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} |