cve-2024-56672
Vulnerability from cvelistv5
Published
2024-12-27 15:06
Modified
2025-02-10 17:21
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Fix UAF in blkcg_unpin_online() blkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To walk up, it uses blkcg_parent(blkcg) but it was calling that after blkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the following UAF: ================================================================== BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270 Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117 CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022 Workqueue: cgwb_release cgwb_release_workfn Call Trace: <TASK> dump_stack_lvl+0x27/0x80 print_report+0x151/0x710 kasan_report+0xc0/0x100 blkcg_unpin_online+0x15a/0x270 cgwb_release_workfn+0x194/0x480 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30 </TASK> ... Freed by task 1944: kasan_save_track+0x2b/0x70 kasan_save_free_info+0x3c/0x50 __kasan_slab_free+0x33/0x50 kfree+0x10c/0x330 css_free_rwork_fn+0xe6/0xb30 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30 Note that the UAF is not easy to trigger as the free path is indirected behind a couple RCU grace periods and a work item execution. I could only trigger it with artifical msleep() injected in blkcg_unpin_online(). Fix it by reading the parent pointer before destroying the blkcg's blkg's.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29d1e06560f0f6179062ac638b4064deb637d1adPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5baa28569c924d9a90d036c2aaab79f791fedaf8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64afc6fe24c9896c0153e5a199bcea241ecb0d5cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83f5a87ee8caa76a917f59912a74d6811f773c67
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86e6ca55b83c575ab0f2e105cf08f98e58d3d7afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a07350fe070017a887433f4d6909433955be5f1
Impacted products
Vendor Product Version
Linux Linux Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
Version: 4308a434e5e08c78676aa66bc626ef78cbef0883
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   Linux Linux Version: 5.7
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              "userInteraction": "NONE",
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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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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\u0027s blkg\u0027s."
        }
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          "url": "https://git.kernel.org/stable/c/83f5a87ee8caa76a917f59912a74d6811f773c67"
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          "url": "https://git.kernel.org/stable/c/8a07350fe070017a887433f4d6909433955be5f1"
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          "url": "https://git.kernel.org/stable/c/86e6ca55b83c575ab0f2e105cf08f98e58d3d7af"
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      "title": "blk-cgroup: Fix UAF in blkcg_unpin_online()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56672",
    "datePublished": "2024-12-27T15:06:33.358Z",
    "dateReserved": "2024-12-27T15:00:39.845Z",
    "dateUpdated": "2025-02-10T17:21:07.331Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56672\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T15:15:27.107\",\"lastModified\":\"2025-02-10T18:15:31.643\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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   \u003cTASK\u003e\\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   \u003c/TASK\u003e\\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\u0027s blkg\u0027s.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: blk-cgroup: corrige UAF en blkcg_unpin_online() blkcg_unpin_online() sube por la jerarqu\u00eda blkcg y coloca el pin en l\u00ednea. Para subir, usa blkcg_parent(blkcg) pero lo estaba llamando despu\u00e9s de blkcg_destroy_blkgs(blkcg) que podr\u00eda liberar el blkcg, lo que lleva al siguiente UAF: ====================================================================== ERROR: KASAN: slab-use-after-free en blkcg_unpin_online+0x15a/0x270 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881057678c0 por la tarea kworker/9:1/117 CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 No contaminado 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS desconocido 02/02/2022 Cola de trabajo: cgwb_release cgwb_release_workfn Seguimiento de llamadas:  dump_stack_lvl+0x27/0x80 print_report+0x151/0x710 kasan_report+0xc0/0x100 blkcg_unpin_online+0x15a/0x270 cgwb_release_workfn+0x194/0x480 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30  ... Liberado por la tarea 1944: kasan_save_track+0x2b/0x70 kasan_save_free_info+0x3c/0x50 __kasan_slab_free+0x33/0x50 kfree+0x10c/0x330 css_free_rwork_fn+0xe6/0xb30 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30 Tenga en cuenta que el UAF no es f\u00e1cil de activar ya que la ruta libre es Se produjo un error indirecto detr\u00e1s de un par de per\u00edodos de gracia de RCU y una ejecuci\u00f3n de elemento de trabajo. Solo pude activarlo con msleep() artificial inyectado en blkcg_unpin_online(). Solucione el problema leyendo el puntero principal antes de destruir los blkg de blkcg.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.0,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7\",\"versionEndExcluding\":\"6.1.121\",\"matchCriteriaId\":\"DA13D8C8-4561-4F7A-8047-DAD1CB2DABD7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.67\",\"matchCriteriaId\":\"BF4F2CD1-2CA6-4D6B-9B0C-57C3C4D6544A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.6\",\"matchCriteriaId\":\"0CB1A9BB-F95E-43DD-A2FD-147912FD91E5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481-106D-4B15-B4C7-FB0213B8E1D4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/29d1e06560f0f6179062ac638b4064deb637d1ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5baa28569c924d9a90d036c2aaab79f791fedaf8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/64afc6fe24c9896c0153e5a199bcea241ecb0d5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/83f5a87ee8caa76a917f59912a74d6811f773c67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86e6ca55b83c575ab0f2e105cf08f98e58d3d7af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8a07350fe070017a887433f4d6909433955be5f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-56672\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-10T17:12:31.915249Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-10T17:12:33.315Z\"}}], \"cna\": {\"title\": \"blk-cgroup: Fix UAF in blkcg_unpin_online()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"83f5a87ee8caa76a917f59912a74d6811f773c67\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"8a07350fe070017a887433f4d6909433955be5f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"64afc6fe24c9896c0153e5a199bcea241ecb0d5c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"5baa28569c924d9a90d036c2aaab79f791fedaf8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"29d1e06560f0f6179062ac638b4064deb637d1ad\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4308a434e5e08c78676aa66bc626ef78cbef0883\", \"lessThan\": \"86e6ca55b83c575ab0f2e105cf08f98e58d3d7af\", \"versionType\": \"git\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.234\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.177\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.121\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.67\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/83f5a87ee8caa76a917f59912a74d6811f773c67\"}, {\"url\": \"https://git.kernel.org/stable/c/8a07350fe070017a887433f4d6909433955be5f1\"}, {\"url\": \"https://git.kernel.org/stable/c/64afc6fe24c9896c0153e5a199bcea241ecb0d5c\"}, {\"url\": \"https://git.kernel.org/stable/c/5baa28569c924d9a90d036c2aaab79f791fedaf8\"}, {\"url\": \"https://git.kernel.org/stable/c/29d1e06560f0f6179062ac638b4064deb637d1ad\"}, {\"url\": \"https://git.kernel.org/stable/c/86e6ca55b83c575ab0f2e105cf08f98e58d3d7af\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"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   \u003cTASK\u003e\\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   \u003c/TASK\u003e\\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\u0027s blkg\u0027s.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-02-02T10:15:14.888Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56672\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-10T17:21:07.331Z\", \"dateReserved\": \"2024-12-27T15:00:39.845Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-27T15:06:33.358Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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