UBUNTU-CVE-2023-4921
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 qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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 qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
05 / REFERENCES
Further evidence
- https://lore.kernel.org/all/[email protected]/
- https://ubuntu.com/security/CVE-2023-4921
- https://ubuntu.com/security/notices/USN-6439-1
- https://ubuntu.com/security/notices/USN-6439-2
- https://ubuntu.com/security/notices/USN-6440-1
- https://ubuntu.com/security/notices/USN-6440-2
- https://ubuntu.com/security/notices/USN-6440-3
- https://ubuntu.com/security/notices/USN-6441-1
- https://ubuntu.com/security/notices/USN-6441-2
- https://ubuntu.com/security/notices/USN-6441-3
- https://ubuntu.com/security/notices/USN-6442-1
- https://ubuntu.com/security/notices/USN-6444-1
- https://ubuntu.com/security/notices/USN-6444-2
- https://ubuntu.com/security/notices/USN-6445-1
- https://ubuntu.com/security/notices/USN-6445-2
- https://ubuntu.com/security/notices/USN-6446-1
- https://ubuntu.com/security/notices/USN-6446-2
- https://ubuntu.com/security/notices/USN-6446-3
- https://ubuntu.com/security/notices/USN-6454-1
- https://ubuntu.com/security/notices/USN-6454-2
- https://ubuntu.com/security/notices/USN-6454-3
- https://ubuntu.com/security/notices/USN-6454-4
- https://ubuntu.com/security/notices/USN-6461-1
- https://ubuntu.com/security/notices/USN-6466-1
- https://ubuntu.com/security/notices/USN-6479-1
- https://ubuntu.com/security/notices/USN-6699-1
- https://www.cve.org/CVERecord?id=CVE-2023-4921