Use-after-free in Linux kernel - CVE-2023-0240

Vulnerability identifier: #VU82895

CSH Severity: Low

CVSS v4: 8.5 [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]

CVE-ID: CVE-2023-0240

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a use-after-free error within the io_uring's implementation in io_prep_async_work function. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.

Linux kernel
openEuler
kernel
python3-perf
kernel-tools-devel
perf-debuginfo
kernel-tools-debuginfo
kernel-headers
kernel-debuginfo
kernel-debugsource
kernel-devel
python3-perf-debuginfo
kernel-tools
kernel-source
bpftool
perf
bpftool-debuginfo

Install update from vendor's website.

kernel - update to 5.10.0-136.21.0.97
python3-perf - update to 5.10.0-136.21.0.97
kernel-tools-devel - update to 5.10.0-136.21.0.97
perf-debuginfo - update to 5.10.0-136.21.0.97
kernel-tools-debuginfo - update to 5.10.0-136.21.0.97
kernel-headers - update to 5.10.0-136.21.0.97
kernel-debuginfo - update to 5.10.0-136.21.0.97
kernel-debugsource - update to 5.10.0-136.21.0.97
kernel-devel - update to 5.10.0-136.21.0.97
python3-perf-debuginfo - update to 5.10.0-136.21.0.97
kernel-tools - update to 5.10.0-136.21.0.97
kernel-source - update to 5.10.0-136.21.0.97
bpftool - update to 5.10.0-136.21.0.97
perf - update to 5.10.0-136.21.0.97
bpftool-debuginfo - update to 5.10.0-136.21.0.97

• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93
• https://github.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49
• https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93

• Privilege escalation in Linux kernel io_uring
• openEuler 22.03 LTS SP1 update for kernel