Use-after-free in Linux kernel - CVE-2021-47232

Vulnerability identifier: #VU90088

CSH Severity: Low

CVSS v4 BT: 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-2021-47232

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a use-after-free error within the j1939_session_skb_drop_old(), j1939_session_skb_queue(), j1939_session_skb_find_by_offset(), j1939_session_tx_dat(), j1939_xtp_txnext_receiver(), j1939_simple_txnext(), j1939_session_completed() and j1939_xtp_rx_dat_one() functions in net/can/j1939/transport.c. A local user can escalate privileges on the system.

Linux kernel
openEuler
kernel
perf-debuginfo
kernel-debugsource
python2-perf-debuginfo
bpftool
kernel-tools-debuginfo
kernel-source
kernel-debuginfo
python2-perf
perf
python3-perf-debuginfo
kernel-tools-devel
kernel-tools
bpftool-debuginfo
python3-perf
kernel-devel

Install update from vendor's website.

Linux kernel - addressed in versions 5.4.128, 5.10.46, 5.12.13, 5.13
kernel - update to 4.19.90-2406.4.0.0283
perf-debuginfo - update to 4.19.90-2406.4.0.0283
kernel-debugsource - update to 4.19.90-2406.4.0.0283
python2-perf-debuginfo - update to 4.19.90-2406.4.0.0283
bpftool - update to 4.19.90-2406.4.0.0283
kernel-tools-debuginfo - update to 4.19.90-2406.4.0.0283
kernel-source - update to 4.19.90-2406.4.0.0283
kernel-debuginfo - update to 4.19.90-2406.4.0.0283
python2-perf - update to 4.19.90-2406.4.0.0283
perf - update to 4.19.90-2406.4.0.0283
python3-perf-debuginfo - update to 4.19.90-2406.4.0.0283
kernel-tools-devel - update to 4.19.90-2406.4.0.0283
kernel-tools - update to 4.19.90-2406.4.0.0283
bpftool-debuginfo - update to 4.19.90-2406.4.0.0283
python3-perf - update to 4.19.90-2406.4.0.0283
kernel-devel - update to 4.19.90-2406.4.0.0283

• https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256
• https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22
• https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705
• https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.46
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.128

• Use-after-free in Linux kernel can j1939
• openEuler 20.03 LTS SP4 update for kernel