375 lines
18 KiB
JSON
375 lines
18 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-2024-38384",
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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": "2024-06-21T11:16:40.612Z",
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"datePublished": "2024-06-24T13:50:51.033Z",
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"dateUpdated": "2026-08-05T11:32:34.192Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:32:34.192Z"
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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: fix list corruption from reorder of WRITE ->lqueued\n\n__blkcg_rstat_flush() can be run anytime, especially when blk_cgroup_bio_start\nis being executed.\n\nIf WRITE of `->lqueued` is re-ordered with READ of 'bisc->lnode.next' in\nthe loop of __blkcg_rstat_flush(), `next_bisc` can be assigned with one\nstat instance being added in blk_cgroup_bio_start(), then the local\nlist in __blkcg_rstat_flush() could be corrupted.\n\nFix the issue by adding one barrier."
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}
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],
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"metrics": [
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{
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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 vulnerable code is reached through local block-I/O submission (`submit_bio_noacct_nocheck` → `blk_cgroup_bio_start`) and local cgroupfs reads of `io.stat`; there is no network-facing path into blk-cgroup stat accounting.\nAC:L - The attacker drives both sides of the race — continuous bio submission on multiple CPUs plus a tight loop reading `io.stat` (or removing cgroups) to force `blkcg_rstat_flush` — and can retry indefinitely with no cost until the reorder window is hit on any weakly-ordered CPU.\nPR:L - No capability check exists on either code path; any unprivileged local user performing ordinary file I/O inside a non-root cgroup-v2 blkcg (the default for every systemd user session and every container) can reach both `blk_cgroup_bio_start()` and, via their delegated subtree's `io.stat`, the flush side.\nUI:N - The attacker triggers everything from its own processes — I/O submission and stat flushing — with no action required from any other user or administrator.\nS:U - The corruption is confined to kernel block-cgroup structures within the same security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - Corruption of the lockless list defeats the `__blkg_release()` flush that guarantees no `blkg_iostat_set` is queued before `free_percpu(blkg->iostat_cpu)`, leaving the list pointing into freed per-CPU memory that is then dereferenced (`bisc->blkg`, `blkg->parent`) — a use-after-free read that can be leveraged for kernel memory disclosure.\nI:H - The same stale-pointer condition makes `blkcg_iostat_update()` write through a `blkg` pointer read out of freed memory, giving an attacker-influenceable write primitive; the llist `next` pointers themselves are also corrupted with attacker-timed values.\nA:H - Re-adding a node that is still linked creates a cycle in the lockless list, so the next `__blkcg_rstat_flush()` loops forever while holding the `blkg_stat_lock` raw spinlock with interrupts disabled under `cgroup_rstat_lock` — a hard lockup / kernel panic that wedges the whole system."
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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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"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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"lessThanOrEqual": "6.6.*",
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},
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{
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"version": "6.9.4",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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},
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{
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"version": "6.10",
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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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"cpeApplicability": [
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}
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"title": "blk-cgroup: fix list corruption from reorder of WRITE ->lqueued",
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"engine": "bippy-1.2.0"
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"content": {
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"timestamp": "2024-06-25T13:27:38.979262Z",
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"id": "CVE-2024-38384",
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