CVE-2023-4921
- Source
- https://cve.org/CVERecord?id=CVE-2023-4921
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4921.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-4921
- Downstream
- Related
- Published
- 2023-09-12T20:15:10.573Z
- Modified
- 2026-03-15T22:47:41.133279Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.
When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfqdequeue() due to the incorrect .peek handler of schplug and lack of error checking in agg_dequeue().
We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
- References
-
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8
Affected packages
Git /
Database specific
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4921.json"
unresolved_ranges
[
{
"events": [
{
"introduced": "3.8"
},
{
"fixed": "4.14.326"
}
]
},
{
"events": [
{
"introduced": "4.15"
},
{
"fixed": "4.19.295"
}
]
},
{
"events": [
{
"introduced": "4.20"
},
{
"fixed": "5.4.257"
}
]
},
{
"events": [
{
"introduced": "5.5"
},
{
"fixed": "5.10.195"
}
]
},
{
"events": [
{
"introduced": "5.11"
},
{
"fixed": "5.15.132"
}
]
},
{
"events": [
{
"introduced": "5.16"
},
{
"fixed": "6.1.54"
}
]
},
{
"events": [
{
"introduced": "6.2"
},
{
"fixed": "6.5.4"
}
]
},
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "10.0"
}
]
}
]