UBUNTU-CVE-2023-3776
A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
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: cls_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 0323bce598eea038714f941ce2b22541c46d488f.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/0323bce598eea038714f941ce2b22541c46d488f
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=0323bce598eea038714f941ce2b22541c46d488f
- https://kernel.dance/0323bce598eea038714f941ce2b22541c46d488f
- https://ubuntu.com/security/CVE-2023-3776
- https://ubuntu.com/security/notices/USN-6285-1
- https://ubuntu.com/security/notices/USN-6309-1
- https://ubuntu.com/security/notices/USN-6315-1
- https://ubuntu.com/security/notices/USN-6317-1
- https://ubuntu.com/security/notices/USN-6318-1
- https://ubuntu.com/security/notices/USN-6321-1
- https://ubuntu.com/security/notices/USN-6324-1
- https://ubuntu.com/security/notices/USN-6325-1
- https://ubuntu.com/security/notices/USN-6327-1
- https://ubuntu.com/security/notices/USN-6328-1
- https://ubuntu.com/security/notices/USN-6329-1
- https://ubuntu.com/security/notices/USN-6330-1
- https://ubuntu.com/security/notices/USN-6331-1
- https://ubuntu.com/security/notices/USN-6332-1
- https://ubuntu.com/security/notices/USN-6341-1
- https://ubuntu.com/security/notices/USN-6342-1
- https://ubuntu.com/security/notices/USN-6342-2
- https://ubuntu.com/security/notices/USN-6346-1
- https://ubuntu.com/security/notices/USN-6348-1
- https://ubuntu.com/security/notices/USN-6357-1
- https://ubuntu.com/security/notices/USN-6385-1
- https://ubuntu.com/security/notices/USN-6397-1
- https://www.cve.org/CVERecord?id=CVE-2023-3776