328 lines
17 KiB
JSON
328 lines
17 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-2024-56672",
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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": "2024-12-27T15:00:39.845Z",
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"datePublished": "2024-12-27T15:06:33.358Z",
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"dateUpdated": "2026-10-15T01:00:09.676Z"
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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": "2026-08-05T11:46:00.581Z"
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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 UAF in blkcg_unpin_online()\n\nblkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\n Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\n\n CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n Workqueue: cgwb_release cgwb_release_workfn\n Call Trace:\n <TASK>\n dump_stack_lvl+0x27/0x80\n print_report+0x151/0x710\n kasan_report+0xc0/0x100\n blkcg_unpin_online+0x15a/0x270\n cgwb_release_workfn+0x194/0x480\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n ...\n Freed by task 1944:\n kasan_save_track+0x2b/0x70\n kasan_save_free_info+0x3c/0x50\n __kasan_slab_free+0x33/0x50\n kfree+0x10c/0x330\n css_free_rwork_fn+0xe6/0xb30\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\n\nFix it by reading the parent pointer before destroying the blkcg's blkg's."
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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 reached only through local operations — creating/enabling an `io` cgroup, dirtying pages to instantiate a cgroup writeback structure, and rmdir'ing the cgroup. No network-facing code path reaches `blkcg_unpin_online()`.\nAC:L - The attacker drives both sides: the cgwb release that reaches the stale read and the css free chain are both initiated by its own cgroup teardown, and the window is widened at will via `blkcg_destroy_blkgs()`'s `cond_resched()` loop (blkg count, CPU load) while the create/write/rmdir cycle can be repeated indefinitely until the race lands.\nPR:L - An unprivileged user needs only write access to a delegated cgroup v2 subtree with the io controller enabled — standard under systemd user delegation, container runtimes, and unprivileged podman — plus ordinary buffered writes; no capability check guards the path.\nUI:N - The attacker performs every step itself — cgroup creation, file writes, and cgroup removal — with no victim action required.\nS:U - The corruption occurs in kernel slab memory and impacts the same kernel security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `struct blkcg` is allocated from a general kmalloc cache, so the freed object can be sprayed with attacker-controlled data; the stale `css.parent` read produces a controlled pointer that is subsequently dereferenced, giving a path to disclose arbitrary kernel memory.\nI:H - The UAF-derived pointer is fed straight into `refcount_dec_and_test(&blkcg->online_pin)` — an arbitrary decrement — and into `blkcg_destroy_blkgs()`, which performs hlist unlink writes on the bogus object, yielding write primitives suitable for control-flow hijack and privilege escalation.\nA:H - Even unweaponized, the slab-use-after-free reliably corrupts memory and oopses/panics the kernel, as demonstrated by the reported KASAN splat in a cgwb_release kworker."
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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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"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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{
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"block/blk-cgroup.c"
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],
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"status": "affected"
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"version": "0",
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},
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"version": "5.10.234",
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},
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"version": "6.12.6",
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"lessThanOrEqual": "6.12.*",
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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}
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],
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"title": "blk-cgroup: Fix UAF in blkcg_unpin_online()",
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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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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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"userInteraction": "NONE",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2024-56672",
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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": "2025-02-10T17:12:31.915249Z"
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}
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}
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}
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],
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"problemTypes": [
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"shortName": "CISA-ADP",
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"dateUpdated": "2025-02-10T17:21:07.331Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T20:52:20.150Z"
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}
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},
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{
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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:00:09.676Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "V1.1.1",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
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}
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]
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}
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]
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}
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} |