CVE-2024-56672 (GCVE-0-2024-56672)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:06 – Updated: 2025-11-03 20:52
VLAI?
Title
blk-cgroup: Fix UAF in blkcg_unpin_online()
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.
CWE
Assigner
Impacted products
Vendor Product Version
Linux Linux Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 83f5a87ee8caa76a917f59912a74d6811f773c67 (git)
Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 8a07350fe070017a887433f4d6909433955be5f1 (git)
Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 64afc6fe24c9896c0153e5a199bcea241ecb0d5c (git)
Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 5baa28569c924d9a90d036c2aaab79f791fedaf8 (git)
Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 29d1e06560f0f6179062ac638b4064deb637d1ad (git)
Affected: 4308a434e5e08c78676aa66bc626ef78cbef0883 , < 86e6ca55b83c575ab0f2e105cf08f98e58d3d7af (git)
Create a notification for this product.
    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.121 , ≤ 6.1.* (semver)
Unaffected: 6.6.67 , ≤ 6.6.* (semver)
Unaffected: 6.12.6 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website

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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.177\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.121\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.67\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.6\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T10:01:48.688Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56672\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T10:01:48.688Z\", \"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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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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