Use-after-free in Linux kernel - CVE-2025-21967

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Main Vulnerability Database Vulnerabilities #VU106625

Use-after-free in Linux kernel - CVE-2025-21967

Published: April 2, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU106625
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-2025-21967
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a use-after-free error within the alloc_opinfo(), smb2_lease_break_noti(), wait_lease_breaking(), oplock_break(), smb_send_parent_lease_break_noti(), smb_lazy_parent_lease_break_close(), smb_grant_oplock(), smb_break_all_write_oplock() and smb_break_all_levII_oplock() functions in fs/smb/server/oplock.c, within the ksmbd_alloc_work_struct() and ksmbd_free_work_struct() functions in fs/smb/server/ksmbd_work.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
Ubuntu
openEuler
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-hwe-6.8 (Ubuntu package)
linux-azure-nvidia (Ubuntu package)
linux-azure (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-realtime (Ubuntu package)
linux-realtime-6.8 (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

How to mitigate CVE-2025-21967

Install update from vendor's website.

Linux kernel - update to 6.6.84
python3-perf-debuginfo - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
bpftool - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
bpftool-debuginfo - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-debuginfo - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-debugsource - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-devel - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-headers - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-tools - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-tools-debuginfo - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-tools-devel - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
perf - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
perf-debuginfo - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
python3-perf - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-source - addressed in versions 6.6.0-109.0.0.101, 6.6.0-109.0.0.112, 6.6.0-109.0.0.115
kernel-extra-modules - update to 6.6.0-109.0.0.115
linux (Ubuntu package) - addressed in versions 6.8.0-84.84, 6.8.0-84.84.1, 6.8.0-84.84.1~22.04.1, 6.8.0-1023.25, 6.8.0-1036.40, 6.8.0-1039.41, 6.8.0-1040.42, 6.11.0-28.28, 6.11.0-28.28~24.04.1, 6.11.0-1011.11, 6.11.0-1014.14, 6.11.0-1015.16, 6.11.0-1016.16, 6.11.0-1016.16~24.04.1, 6.11.0-1017.18
linux-hwe-6.8 (Ubuntu package) - addressed in versions 6.8.0-84.84~22.04.1, 6.8.0-85.85~22.04.1
linux-azure-nvidia (Ubuntu package) - update to 6.8.0-1025.27
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1036.42~22.04.1, 6.8.0-1038.44, 6.11.0-1018.18, 6.11.0-1018.18~24.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1037.37, 6.8.0-1037.37~22.04.1
linux-oracle (Ubuntu package) - update to 6.8.0-1037.38
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1037.38~22.04.1
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1039.41~22.04.1, 6.8.0-1040.42~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1039.42, 6.8.0-1039.42.1, 6.8.0-1039.42~22.04.1
linux-raspi (Ubuntu package) - update to 6.8.0-1039.43
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2031.32
linux-realtime (Ubuntu package) - update to 6.8.1-1034.35
linux-realtime-6.8 (Ubuntu package) - update to 6.8.1-1034.35~22.04.1
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16, 6.11.0-1015.16~24.04.2
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24

External References

Related Security Bulletins