Use-after-free in Linux kernel - CVE-2025-37776

Vulnerability identifier: #VU108237

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-2025-37776

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 free_opinfo(), opinfo_get_list(), opinfo_put(), opinfo_add(), opinfo_del() and smb_break_all_levII_oplock() functions in fs/smb/server/oplock.c. A local user can escalate privileges on the system.

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

Install update from vendor's website.

Linux kernel - update to 6.14.4
python3-perf-debuginfo - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
bpftool - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
bpftool-debuginfo - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-debuginfo - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-debugsource - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-devel - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-headers - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-tools - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-tools-debuginfo - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-tools-devel - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
perf - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
perf-debuginfo - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
python3-perf - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-source - addressed in versions 6.6.0-129.0.0.114, 6.6.0-129.0.0.127
kernel-extra-modules - update to 6.6.0-129.0.0.127
linux (Ubuntu package) - addressed in versions 6.14.0-22.22, 6.14.0-1004.4, 6.14.0-1007.7, 6.14.0-1008.8
linux-aws (Ubuntu package) - addressed in versions 6.14.0-1007.7, 6.14.0-1007.7+1
linux-azure (Ubuntu package) - update to 6.14.0-1007.7

• https://git.kernel.org/stable/c/18b4fac5ef17f77fed9417d22210ceafd6525fc7
• https://git.kernel.org/stable/c/296cb5457cc6f4a754c4ae29855f8a253d52bcc6
• https://git.kernel.org/stable/c/d54ab1520d43e95f9b2e22d7a05fc9614192e5a5
• https://git.kernel.org/stable/c/d73686367ad68534257cd88a36ca3c52cb8b81d8
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.14.4

• Use-after-free in Linux kernel smb server
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• openEuler 24.03 LTS SP2 update for kernel
• openEuler 24.03 LTS SP1 update for kernel
• openEuler 24.03 LTS update for kernel