Medium severity5.5NVD Advisory· Published Feb 11, 2022· Updated Jun 17, 2026

CVE-2021-45402

Description

The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

osv-coords75 versions
pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3 pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP4 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP4 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP4 pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.4 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP4 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP4 pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP4 pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.4 pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP3 pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_16&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-preempt&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/kernel-rt_debug&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/suse/kernel-source-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/suse/kernel-rt&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3 pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3 pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3 pkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4 pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4 pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP4 pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP4 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP4 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP4 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4 pkg:rpm/suse/kernel-livepatch-SLE15-SP4_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP4 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP4 pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.4 pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.4 pkg:rpm/suse/kernel-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/suse/kernel-syms-rt&distro=SUSE%20Real%20Time%20Module%2015%20SP3 pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3 pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3 pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3 pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3 pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.3
< 5.3.18-150300.38.53.1+ 74 more
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.14.21-150400.14.7.1
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 1-150300.7.5.3
- (no CPE)range: < 5.3.18-150300.59.60.4.150300.18.37.5
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.82.1
- (no CPE)range: < 5.3.18-150300.82.1
- (no CPE)range: < 5.3.18-150300.82.1
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.3.18-150300.38.53.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1.150400.24.3.6
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 1-150400.9.5.3
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1.150400.24.3.6
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.14.21-150400.24.11.1
- (no CPE)range: < 5.3.18-150300.82.1
- (no CPE)range: < 5.3.18-150300.82.1
- (no CPE)range: < 5.3.18-150300.59.60.4.150300.18.37.5
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4.150300.18.37.5
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
- (no CPE)range: < 5.3.18-150300.59.60.4
Linux/Kernelllm-fuzzy8 versions
<=v5.16-rc5+ 7 more
- (no CPE)range: <=v5.16-rc5
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: <5.16
- cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.16:rc5:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/nvdPatchVendor Advisory
git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/nvdExploitPatchVendor Advisory
git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/nvdExploitPatchVendor Advisory

News mentions

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cvss	0.358
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000