DEBIAN-CVE-2024-56672

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Source
https://security-tracker.debian.org/tracker/DEBIAN-CVE-2024-56672
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-56672.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2024-56672
Upstream
Published
2024-12-27T15:15:27Z
Modified
2025-09-19T07:34:16.446505Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Fix UAF in blkcgunpinonline() blkcgunpinonline() walks up the blkcg hierarchy putting the online pin. To walk up, it uses blkcgparent(blkcg) but it was calling that after blkcgdestroyblkgs(blkcg) which could free the blkcg, leading to the following UAF: ================================================================== BUG: KASAN: slab-use-after-free in blkcgunpinonline+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: cgwbrelease cgwbreleaseworkfn Call Trace: <TASK> dumpstacklvl+0x27/0x80 printreport+0x151/0x710 kasanreport+0xc0/0x100 blkcgunpinonline+0x15a/0x270 cgwbreleaseworkfn+0x194/0x480 processscheduledworks+0x71b/0xe20 workerthread+0x82a/0xbd0 kthread+0x242/0x2c0 retfromfork+0x33/0x70 retfromforkasm+0x1a/0x30 </TASK> ... Freed by task 1944: kasansavetrack+0x2b/0x70 kasansavefreeinfo+0x3c/0x50 _kasanslabfree+0x33/0x50 kfree+0x10c/0x330 cssfreerworkfn+0xe6/0xb30 processscheduledworks+0x71b/0xe20 workerthread+0x82a/0xbd0 kthread+0x242/0x2c0 retfromfork+0x33/0x70 retfromforkasm+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 blkcgunpin_online(). Fix it by reading the parent pointer before destroying the blkcg's blkg's.

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.234-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1
5.10.84-1
5.10.92-1~bpo10+1
5.10.92-1
5.10.92-2
5.10.103-1~bpo10+1
5.10.103-1
5.10.106-1
5.10.113-1
5.10.120-1~bpo10+1
5.10.120-1
5.10.127-1
5.10.127-2~bpo10+1
5.10.127-2
5.10.136-1
5.10.140-1
5.10.148-1
5.10.149-1
5.10.149-2
5.10.158-1
5.10.158-2
5.10.162-1
5.10.178-1
5.10.178-2
5.10.178-3
5.10.179-1
5.10.179-2
5.10.179-3
5.10.179-4
5.10.179-5
5.10.191-1
5.10.197-1
5.10.205-1
5.10.205-2
5.10.209-1
5.10.209-2
5.10.216-1
5.10.218-1
5.10.221-1
5.10.223-1
5.10.226-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.123-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1
6.1.55-1
6.1.64-1
6.1.66-1
6.1.67-1
6.1.69-1~bpo11+1
6.1.69-1
6.1.76-1~bpo11+1
6.1.76-1
6.1.82-1
6.1.85-1
6.1.90-1~bpo11+1
6.1.90-1
6.1.94-1~bpo11+1
6.1.94-1
6.1.98-1
6.1.99-1
6.1.106-1
6.1.106-2
6.1.106-3
6.1.112-1
6.1.115-1
6.1.119-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.12.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.12.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:11 / linux-6.1

Package

Name
linux-6.1
Purl
pkg:deb/debian/linux-6.1?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.128-1~deb11u1

Affected versions

6.*

6.1.106-3~deb11u1
6.1.106-3~deb11u2
6.1.106-3~deb11u3
6.1.112-1~deb11u1
6.1.119-1~deb11u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}