Use-after-free in Linux kernel - CVE-2021-47335

Vulnerability identifier: #VU90129

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-2021-47335

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 init_f2fs_fs() and exit_f2fs_fs() functions in fs/f2fs/super.c, within the f2fs_recover_fsync_data() function in fs/f2fs/recovery.c, within the f2fs_destroy_garbage_collection_cache() function in fs/f2fs/f2fs.h. A local user can escalate privileges on the system.

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

Install update from vendor's website.

Linux kernel - addressed in versions 5.10.51, 5.12.18, 5.13.3, 5.14
kernel-debugsource - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
python2-perf-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-devel - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-source - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
perf - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
python2-perf - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
bpftool-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
python3-perf - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
python3-perf-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-tools-devel - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
bpftool - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-tools - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
kernel-tools-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278
perf-debuginfo - addressed in versions 4.19.90-2405.5.0.0251, 4.19.90-2405.5.0.0278

• https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048
• https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409
• https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a
• https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.51
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.18
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14

• Use-after-free in Linux kernel f2fs
• openEuler 20.03 LTS SP1 update for kernel
• openEuler 20.03 LTS SP4 update for kernel