Out-of-bounds write in Linux kernel - CVE-2026-74390

Vulnerability identifier: #VU142764

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-2026-74390

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to out-of-bounds write in irdma_copy_user_pgaddrs when processing user-supplied RDMA memory registration data with lvl set to 0. A local user can provide a umem with more DMA blocks than the supplied page count to cause a denial of service or execute arbitrary code.

The issue affects the lvl==0 case that uses the fixed-size iwmr->pgaddrmem array for QP, CQ, and SRQ rings.

Linux kernel
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
openSUSE Leap
kernel-livepatch-SLE15-SP4_Update_59-debugsource
kernel-livepatch-5_14_21-150400_24_240-default
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo
kernel-livepatch-6_4_0-150600_23_135-default
kernel-livepatch-SLE15-SP6_Update_31-debugsource
kernel-source-rt
kernel-rt-debugsource
kernel-rt
kernel-rt-debuginfo
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-source
kernel-macros
kernel-devel
kernel-docs
kernel-default-devel-debuginfo
kernel-default-debugsource
kernel-64kb-debugsource
kernel-64kb
reiserfs-kmp-default
kernel-default-devel
kernel-default-debuginfo
kernel-default
reiserfs-kmp-default-debuginfo
kernel-64kb-devel-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-default-livepatch-devel
kernel-64kb-devel
kernel-default-livepatch
cluster-md-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default
dlm-kmp-default
ocfs2-kmp-default
kernel-64kb-debuginfo
kernel-default-base
kernel-rt-optional-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debuginfo
gfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kselftests-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-devel
kernel-rt-livepatch-devel
kernel-rt-extra-debuginfo
reiserfs-kmp-rt
kselftests-kmp-rt-debuginfo
dlm-kmp-rt
gfs2-kmp-rt
kernel-rt-vdso
cluster-md-kmp-rt
kernel-rt_debug
kernel-devel-rt
kernel-rt_debug-debugsource
kernel-rt_debug-devel-debuginfo
kernel-rt-extra
kernel-rt_debug-vdso
kernel-rt-livepatch
kernel-rt-vdso-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
kernel-rt-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-optional
dlm-kmp-rt-debuginfo
reiserfs-kmp-64kb
gfs2-kmp-64kb
kselftests-kmp-64kb-debuginfo
dlm-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
dlm-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-64kb-extra
cluster-md-kmp-64kb-debuginfo
kernel-64kb-extra-debuginfo
ocfs2-kmp-64kb
kernel-kvmsmall-devel
kselftests-kmp-64kb
kernel-debug-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso
kernel-default-vdso-debuginfo
kernel-debug-vdso
kernel-debug-devel
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-docs-html
kernel-source-vanilla
kernel-kvmsmall
kernel-debug-devel-debuginfo
cluster-md-kmp-64kb
kernel-64kb-optional-debuginfo
gfs2-kmp-64kb-debuginfo
kernel-64kb-optional
kselftests-kmp-default
kernel-default-optional
kernel-default-extra
kselftests-kmp-default-debuginfo
kernel-default-optional-debuginfo
kernel-obs-qa
kernel-default-extra-debuginfo
kernel-debug
kernel-debug-debugsource
kernel-default-base-rebuild

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-livepatch-SLE15-SP4_Update_59-debugsource - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default - update to 1-150400.9.5.1
kernel-livepatch-5_14_21-150400_24_240-default-debuginfo - update to 1-150400.9.5.1
kernel-livepatch-6_4_0-150600_23_135-default-debuginfo - update to 1-150600.13.3.4
kernel-livepatch-6_4_0-150600_23_135-default - update to 1-150600.13.3.4
kernel-livepatch-SLE15-SP6_Update_31-debugsource - update to 1-150600.13.3.4
kernel-source-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debugsource - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-rt-debuginfo - addressed in versions 5.14.21-150400.15.186.1, 5.14.21-150500.13.161.1
kernel-obs-build - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-obs-build-debugsource - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-syms - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-source - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-macros - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-devel - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-docs - addressed in versions 5.14.21-150400.24.240.1, 6.4.0-150600.23.135.1
kernel-default-devel-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-64kb-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-64kb - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
reiserfs-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-64kb-devel-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-zfcpdump-debugsource - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-zfcpdump-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-zfcpdump - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-livepatch-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-64kb-devel - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-livepatch - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
gfs2-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
gfs2-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
dlm-kmp-default-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
cluster-md-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
dlm-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
ocfs2-kmp-default - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-64kb-debuginfo - addressed in versions 5.14.21-150400.24.240.2, 6.4.0-150600.23.135.1
kernel-default-base - addressed in versions 5.14.21-150400.24.240.2.150400.24.120.2, 6.4.0-150600.23.135.1.150600.12.62.4
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt - update to 5.14.21-150500.13.161.1
ocfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-syms-rt - update to 5.14.21-150500.13.161.1
kernel-rt-devel - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.161.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.161.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
dlm-kmp-rt - update to 5.14.21-150500.13.161.1
gfs2-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt-vdso - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.161.1
kernel-rt_debug - update to 5.14.21-150500.13.161.1
kernel-devel-rt - update to 5.14.21-150500.13.161.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.161.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-extra - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.161.1
kernel-rt-livepatch - update to 5.14.21-150500.13.161.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.161.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
kernel-rt-optional - update to 5.14.21-150500.13.161.1
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.161.1
reiserfs-kmp-64kb - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
dlm-kmp-64kb - update to 6.4.0-150600.23.135.1
reiserfs-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-extra - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-extra-debuginfo - update to 6.4.0-150600.23.135.1
ocfs2-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-devel - update to 6.4.0-150600.23.135.1
kselftests-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-debug-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-vdso - update to 6.4.0-150600.23.135.1
kernel-default-vdso - update to 6.4.0-150600.23.135.1
kernel-default-vdso-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug-vdso - update to 6.4.0-150600.23.135.1
kernel-debug-devel - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debugsource - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-devel-debuginfo - update to 6.4.0-150600.23.135.1
kernel-kvmsmall-debuginfo - update to 6.4.0-150600.23.135.1
kernel-docs-html - update to 6.4.0-150600.23.135.1
kernel-source-vanilla - update to 6.4.0-150600.23.135.1
kernel-kvmsmall - update to 6.4.0-150600.23.135.1
kernel-debug-devel-debuginfo - update to 6.4.0-150600.23.135.1
cluster-md-kmp-64kb - update to 6.4.0-150600.23.135.1
kernel-64kb-optional-debuginfo - update to 6.4.0-150600.23.135.1
gfs2-kmp-64kb-debuginfo - update to 6.4.0-150600.23.135.1
kernel-64kb-optional - update to 6.4.0-150600.23.135.1
kselftests-kmp-default - update to 6.4.0-150600.23.135.1
kernel-default-optional - update to 6.4.0-150600.23.135.1
kernel-default-extra - update to 6.4.0-150600.23.135.1
kselftests-kmp-default-debuginfo - update to 6.4.0-150600.23.135.1
kernel-default-optional-debuginfo - update to 6.4.0-150600.23.135.1
kernel-obs-qa - update to 6.4.0-150600.23.135.1
kernel-default-extra-debuginfo - update to 6.4.0-150600.23.135.1
kernel-debug - update to 6.4.0-150600.23.135.1
kernel-debug-debugsource - update to 6.4.0-150600.23.135.1
kernel-default-base-rebuild - update to 6.4.0-150600.23.135.1.150600.12.62.4

• https://git.kernel.org/stable/c/192a3be0e3759daa24af2841208b074ca6dbaabc
• https://git.kernel.org/stable/c/424d51d33c7541a86934067c2c0538124687fc90
• https://git.kernel.org/stable/c/4780f58672ee6328accd54a95f9c00683477e499
• https://git.kernel.org/stable/c/5ebb3ed757be3e04cf803026004aa0beaeb13e9b
• https://git.kernel.org/stable/c/79a20a8e201a779224b4bf115250a7713bde72c0
• https://git.kernel.org/stable/c/9f8f0d2099e3de1194e37dc933ae0c4206b09aaf
• https://git.kernel.org/stable/c/abd27a977b419d584efa659488c22d2306987b29

• Out-of-bounds write in Linux kernel hw irdma driver
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel