Memory leak in Linux kernel - CVE-2025-21768

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU104939

Memory leak in Linux kernel - CVE-2025-21768

Published: February 27, 2025 / Updated: May 11, 2025


Vulnerability identifier: #VU104939
CSH Severity: Low
CVSS v4 BT: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2025-21768
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the seg6_output_core() function in net/ipv6/seg6_iptunnel.c, within the rpl_output() function in net/ipv6/rpl_iptunnel.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Live Patching
Public Cloud Module
SUSE Real Time Module
Confidential Computing Module
Basesystem Module
Development Tools Module
Legacy Module
openSUSE Leap
Ubuntu
kgraft-patch-4_12_14-122_258-default
kernel-livepatch-6_4_0-150600_10_39-rt
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource
kernel-livepatch-6_4_0-150700_7_3-rt-debuginfo
kernel-livepatch-6_4_0-150700_7_3-rt
kernel-livepatch-SLE15-SP7-RT_Update_1-debugsource
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo
kernel-livepatch-6_4_0-150700_53_3-default
kernel-livepatch-SLE15-SP7_Update_1-debugsource
dlm-kmp-default
kernel-default-man
kernel-default-kgraft
gfs2-kmp-default
kernel-default-kgraft-devel
kernel-source
kernel-macros
kernel-default
kernel-devel
cluster-md-kmp-default
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-syms
dlm-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-devel-debuginfo
kernel-default-base
ocfs2-kmp-default
kernel-default-debuginfo
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
kernel-default-devel
kernel-coco_debug
kernel-coco
kernel-coco_debug-debuginfo
kernel-syms-coco
kernel-coco-devel
kernel-coco_debug-devel
kernel-coco-debugsource
reiserfs-kmp-coco
kernel-coco_debug-devel-debuginfo
kernel-coco-debuginfo
kernel-coco-vdso-debuginfo
reiserfs-kmp-coco-debuginfo
kernel-devel-coco
kernel-source-coco
kernel-coco_debug-debugsource
kernel-azure-extra
gfs2-kmp-azure
kernel-syms-azure
reiserfs-kmp-azure
kselftests-kmp-azure
kernel-azure-devel-debuginfo
kselftests-kmp-azure-debuginfo
gfs2-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
dlm-kmp-azure
kernel-source-azure
reiserfs-kmp-azure-debuginfo
kernel-azure-optional
kernel-azure-debugsource
kernel-azure-devel
cluster-md-kmp-azure-debuginfo
kernel-azure-optional-debuginfo
ocfs2-kmp-azure
cluster-md-kmp-azure
kernel-azure-debuginfo
ocfs2-kmp-azure-debuginfo
dlm-kmp-azure-debuginfo
kernel-azure
kernel-azure-vdso-debuginfo
kernel-azure-vdso
kernel-devel-azure
gfs2-kmp-rt
kernel-source-rt
kernel-rt_debug-vdso-debuginfo
kernel-rt-livepatch-devel
kselftests-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-vdso
kernel-rt_debug-debuginfo
kernel-syms-rt
kernel-rt-extra-debuginfo
kernel-rt-devel
kernel-devel-rt
kernel-rt-debuginfo
reiserfs-kmp-rt
kernel-rt-devel-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt-optional-debuginfo
kernel-rt-vdso-debuginfo
dlm-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-rt-extra
kernel-rt-vdso
kernel-rt_debug-devel
kselftests-kmp-rt
kernel-rt_debug-debugsource
dlm-kmp-rt
kernel-rt-optional
ocfs2-kmp-rt
kernel-rt_debug
kernel-rt
kernel-default-livepatch
kernel-default-extra-debuginfo
kernel-default-extra
kernel-obs-build
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-64kb
kernel-default-livepatch-devel
kernel-obs-build-debugsource
kernel-docs
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-64kb-devel-debuginfo
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
linux (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-raspi-realtime (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-aws (Ubuntu package)

How to mitigate CVE-2025-21768

Install update from vendor's website.

Linux kernel - addressed in versions 6.12.16, 6.13.4, 6.14
kgraft-patch-4_12_14-122_258-default - update to 1-8.3.1
kernel-livepatch-6_4_0-150600_10_39-rt - update to 1-150600.1.3.2
kernel-livepatch-6_4_0-150600_10_39-rt-debuginfo - update to 1-150600.1.3.2
kernel-livepatch-SLE15-SP6-RT_Update_11-debugsource - update to 1-150600.1.3.2
kernel-livepatch-6_4_0-150700_7_3-rt-debuginfo - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_7_3-rt - update to 1-150700.1.3.1
kernel-livepatch-SLE15-SP7-RT_Update_1-debugsource - update to 1-150700.1.3.1
kernel-livepatch-6_4_0-150700_53_3-default-debuginfo - update to 1-150700.15.3.1
kernel-livepatch-6_4_0-150700_53_3-default - update to 1-150700.15.3.1
kernel-livepatch-SLE15-SP7_Update_1-debugsource - update to 1-150700.15.3.1
dlm-kmp-default - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-man - update to 4.12.14-122.258.1
kernel-default-kgraft - update to 4.12.14-122.258.1
gfs2-kmp-default - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-kgraft-devel - update to 4.12.14-122.258.1
kernel-source - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-macros - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-devel - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-base-debuginfo - update to 4.12.14-122.258.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-syms - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-debugsource - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-base - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1.150700.17.2.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-default-devel - addressed in versions 4.12.14-122.258.1, 6.4.0-150700.53.3.1
kernel-coco_debug - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-syms-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debugsource - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-devel-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco-vdso-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
reiserfs-kmp-coco-debuginfo - update to 6.4.0-15061.21.coco15sp6.1
kernel-devel-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-source-coco - update to 6.4.0-15061.21.coco15sp6.1
kernel-coco_debug-debugsource - update to 6.4.0-15061.21.coco15sp6.1
kernel-azure-extra - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-syms-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
reiserfs-kmp-azure - update to 6.4.0-150600.8.37.1
kselftests-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-devel-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kselftests-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
gfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-extra-debuginfo - update to 6.4.0-150600.8.37.1
dlm-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-source-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
reiserfs-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-optional - update to 6.4.0-150600.8.37.1
kernel-azure-debugsource - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-devel - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
cluster-md-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-optional-debuginfo - update to 6.4.0-150600.8.37.1
ocfs2-kmp-azure - update to 6.4.0-150600.8.37.1
cluster-md-kmp-azure - update to 6.4.0-150600.8.37.1
kernel-azure-debuginfo - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
ocfs2-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
dlm-kmp-azure-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
kernel-azure-vdso-debuginfo - update to 6.4.0-150600.8.37.1
kernel-azure-vdso - update to 6.4.0-150600.8.37.1
kernel-devel-azure - addressed in versions 6.4.0-150600.8.37.1, 6.4.0-150700.20.3.1
gfs2-kmp-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-source-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt_debug-vdso-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-livepatch-devel - update to 6.4.0-150600.10.39.1
kselftests-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
gfs2-kmp-rt-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
cluster-md-kmp-rt-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt_debug-devel-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt_debug-vdso - update to 6.4.0-150600.10.39.1
kernel-rt_debug-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-syms-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt-extra-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-devel - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-devel-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
reiserfs-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt-devel-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
reiserfs-kmp-rt-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-optional-debuginfo - update to 6.4.0-150600.10.39.1
kernel-rt-vdso-debuginfo - update to 6.4.0-150600.10.39.1
dlm-kmp-rt-debuginfo - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
cluster-md-kmp-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt-debugsource - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt-extra - update to 6.4.0-150600.10.39.1
kernel-rt-vdso - update to 6.4.0-150600.10.39.1
kernel-rt_debug-devel - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kselftests-kmp-rt - update to 6.4.0-150600.10.39.1
kernel-rt_debug-debugsource - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
dlm-kmp-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt-optional - update to 6.4.0-150600.10.39.1
ocfs2-kmp-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt_debug - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-rt - addressed in versions 6.4.0-150600.10.39.1, 6.4.0-150700.7.3.1
kernel-default-livepatch - update to 6.4.0-150700.53.3.1
kernel-default-extra-debuginfo - update to 6.4.0-150700.53.3.1
kernel-default-extra - update to 6.4.0-150700.53.3.1
kernel-obs-build - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default-debuginfo - update to 6.4.0-150700.53.3.1
reiserfs-kmp-default - update to 6.4.0-150700.53.3.1
kernel-64kb - update to 6.4.0-150700.53.3.1
kernel-default-livepatch-devel - update to 6.4.0-150700.53.3.1
kernel-obs-build-debugsource - update to 6.4.0-150700.53.3.1
kernel-docs - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debugsource - update to 6.4.0-150700.53.3.1
kernel-zfcpdump-debuginfo - update to 6.4.0-150700.53.3.1
kernel-zfcpdump - update to 6.4.0-150700.53.3.1
kernel-64kb-devel-debuginfo - update to 6.4.0-150700.53.3.1
kernel-64kb-debuginfo - update to 6.4.0-150700.53.3.1
kernel-64kb-debugsource - update to 6.4.0-150700.53.3.1
kernel-64kb-devel - update to 6.4.0-150700.53.3.1
linux (Ubuntu package) - addressed in versions 6.8.0-78.78, 6.8.0-78.78.1, 6.8.0-78.78.1~22.04.1, 6.8.0-1035.37, 6.8.1-1030.31, 6.11.0-26.26, 6.11.0-26.26~24.04.1, 6.11.0-1010.10, 6.11.0-1013.13, 6.11.0-1015.15, 6.11.0-1015.15~24.04.1, 6.11.0-1022.22
linux-gke (Ubuntu package) - addressed in versions 6.8.0-78.78~22.04.1, 6.8.0-1032.36, 6.8.0-1035.38, 6.8.0-1035.38.1, 6.8.0-1035.38~22.04.1, 6.8.0-1035.39
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1019.21~22.04.1, 6.8.0-1033.33, 6.8.0-1033.33~22.04.1, 6.8.0-1035.37~22.04.1, 6.8.0-1036.38, 6.8.0-1036.38~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1022.23, 6.8.0-1034.39, 6.8.0-1034.39~22.04.1
linux-oracle (Ubuntu package) - update to 6.8.0-1032.33~22.04.1
linux-raspi-realtime (Ubuntu package) - update to 6.8.0-2028.29
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1014.15, 6.11.0-1014.15~24.04.1, 6.11.0-1016.17
linux-aws (Ubuntu package) - update to 6.11.0-1014.15

External References

Related Security Bulletins