Privilege escalation in Linux kernel packet scheduler

1) Use-after-free

EUVDB-ID: #VU78941

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-3609

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the the Linux kernel net/sched: cls_u32 component. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.4 rc1 - 6.4 rc6

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:6.4:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.4:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.4:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.4:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:6.4:rc6:*:*:*:*:*:*

External links

https://kernel.dance/04c55383fa5689357bcdd2c8036725a55ed632bc
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=04c55383fa5689357bcdd2c8036725a55ed632bc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.