CVE-2023-54107

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Source
https://cve.org/CVERecord?id=CVE-2023-54107
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54107.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-54107
Downstream
Related
Published
2025-12-24T13:06:31.505Z
Modified
2026-02-04T02:55:17.196938Z
Summary
blk-cgroup: dropping parent refcount after pd_free_fn() is done
Details

In the Linux kernel, the following vulnerability has been resolved:

blk-cgroup: dropping parent refcount after pdfreefn() is done

Some cgroup policies will access parent pd through child pd even after pdofflinefn() is done. If pdfreefn() for parent is called before child, then UAF can be triggered. Hence it's better to guarantee the order of pdfreefn().

Currently refcount of parent blkg is dropped in _blkgrelease(), which is before pdfreefn() is called in blkgfreeworkfn() while blkgfreeworkfn() is called asynchronously.

This patch make sure pdfreefn() called from removing cgroup is ordered by delaying dropping parent refcount after calling pdfreefn() for child.

BTW, pdfreefn() will also be called from blkcgdeactivatepolicy() from deleting device, and following patches will guarantee the order.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54107.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
d578c770c85233af592e54537f93f3831bde7e9a
Fixed
c7241babf0855d8a6180cd1743ff0ec34de40b4e

Affected versions

v5.*
v5.17
v5.17-rc3
v5.17-rc4
v5.17-rc5
v5.17-rc6
v5.17-rc7
v5.17-rc8
v5.18
v5.18-rc1
v5.18-rc2
v5.18-rc3
v5.18-rc4
v5.18-rc5
v5.18-rc6
v5.18-rc7
v5.19
v5.19-rc1
v5.19-rc2
v5.19-rc3
v5.19-rc4
v5.19-rc5
v5.19-rc6
v5.19-rc7
v5.19-rc8
v6.*
v6.0
v6.0-rc1
v6.0-rc2
v6.0-rc3
v6.0-rc4
v6.0-rc5
v6.0-rc6
v6.0-rc7
v6.1
v6.1-rc1
v6.1-rc2
v6.1-rc3
v6.1-rc4
v6.1-rc5
v6.1-rc6
v6.1-rc7
v6.1-rc8
v6.2-rc1
v6.2-rc2
v6.2-rc3
v6.2-rc4
v6.2-rc5
v6.2-rc6

Database specific

vanir_signatures 
[
    {
        "target": {
            "file": "block/blk-cgroup.c",
            "function": "__blkg_release"
        },
        "id": "CVE-2023-54107-17bfe414",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c7241babf0855d8a6180cd1743ff0ec34de40b4e",
        "digest": {
            "length": 283.0,
            "function_hash": "67172724618575465487732848208919025467"
        },
        "signature_version": "v1",
        "deprecated": false,
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "block/blk-cgroup.c",
            "function": "blkg_free_workfn"
        },
        "id": "CVE-2023-54107-7011e94f",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c7241babf0855d8a6180cd1743ff0ec34de40b4e",
        "digest": {
            "length": 397.0,
            "function_hash": "200186883369170518240738153774639123029"
        },
        "signature_version": "v1",
        "deprecated": false,
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "block/blk-cgroup.c"
        },
        "id": "CVE-2023-54107-cb5e8d3b",
        "source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@c7241babf0855d8a6180cd1743ff0ec34de40b4e",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "4988935689754887389331331750316911996",
                "98002396530071391025572883287810551177",
                "141204743315839806093186370520416731629",
                "139216398823198552658306909401603756299",
                "292078462098062965547420795992669211509",
                "175408663656895402505989086499873826232",
                "132489402297869546735564834849348014670",
                "293414004345354603215609366070639846000"
            ]
        },
        "signature_version": "v1",
        "deprecated": false,
        "signature_type": "Line"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54107.json"