Use-after-free in Linux kernel - CVE-2025-40119

Vulnerability identifier: #VU118398

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-2025-40119

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 ext4_discard_work() function in fs/ext4/mballoc.c. A local user can escalate privileges on the system.

Linux kernel
openEuler
Ubuntu
bpftool
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-extra-modules
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

Install update from vendor's repository.

bpftool - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
python3-perf-debuginfo - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
python3-perf - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
perf-debuginfo - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
perf - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-tools-devel - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-tools-debuginfo - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-tools - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-source - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-headers - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-devel - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-debugsource - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-debuginfo - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
bpftool-debuginfo - addressed in versions 6.6.0-119.0.0.110, 6.6.0-119.0.0.122, 6.6.0-119.0.0.123
kernel-extra-modules - update to 6.6.0-119.0.0.123
linux (Ubuntu package) - addressed in versions 6.17.0-14.14, 6.17.0-1006.7, 6.17.0-1008.8
linux-gcp (Ubuntu package) - update to 6.17.0-1007.7
linux-aws (Ubuntu package) - update to 6.17.0-1007.7
linux-azure (Ubuntu package) - update to 6.17.0-1008.8
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1011.11

• https://git.kernel.org/stable/c/00110f3cfc9b34b2dfee2a6c9e55a0ae6df125ae
• https://git.kernel.org/stable/c/3c3fac6bc0a9c00dbe65d8dc0d3a282afe4d3188

• Use-after-free in Linux kernel ext4
• openEuler 24.03 LTS update for kernel
• openEuler 24.03 LTS SP2 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-aws
• Ubuntu update for linux-oem-6.17
• Ubuntu update for linux-azure