CVE-2021-45402
published 2022-02-11CVE-2021-45402: 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…
PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCHINAN
EPSS
0.42%
34.3th percentile
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."
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.15.15-1 (bookworm) | linux 5.15.15-1 (bookworm) |
| linux | linux_kernel | < 5.16 | 5.16 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.92-1 | 5.10.92-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| linux | linux_kernel | >= 0 < 5.15.15-1 | 5.15.15-1 |
| msrc | cbl2_kernel_5.15.26.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cm1_kernel_5.10.102.1-1_on_cbl_mariner_1.0 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
nvdv2.02.1LOWAV:L/AC:L/Au:N/C:P/I:N/A:N
osv6.5MEDIUM
vendor_ubuntu6.5MEDIUM
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2022-04-06·CVSS 6.5
CVE-2021-28713 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the BPF verifier in the Linux kernel did not
properly restrict pointer types in certain situations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-23222)
It was discovered that the network traffic control implementation in the
Linux kernel contained a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-1055)
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2022-03-22·CVSS 6.5
CVE-2021-45480 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the BPF verifier in the Linux kernel did not
properly restrict pointer types in certain situations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-23222)
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
Jürgen Groß discovered that the Xen subsystem within the Linux kernel did
not adequately limit the number of events driver domains (unprivileged PV
backends) could send to other guest VMs. An attacke
Red Hat
kernel: pointer leak in check_alu_op() of kernel/bpf/verifier.c
vendor_redhat·2022-02-11·CVSS 5.5
CVE-2021-45402 [MEDIUM] CWE-120 kernel: pointer leak in check_alu_op() of kernel/bpf/verifier.c
kernel: pointer leak in check_alu_op() of kernel/bpf/verifier.c
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."
A memory leak flaw was found in the Linux kernel’s BPF subsystem in the way a user triggers the check_alu_op function of the BPF verifier. This flaw allows a local user to obtain unauthorized memory access or potentially crash the system.
Mitigation: The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able
Microsoft
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 potent
vendor_msrc·2022-02-08·CVSS 5.5
CVE-2021-45402 [MEDIUM] CWE-668 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 potent
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."
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact
Debian
CVE-2021-45402: linux - The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through...
vendor_debian·2021·CVSS 5.5
CVE-2021-45402 [MEDIUM] CVE-2021-45402: linux - The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through...
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."
Scope: local
bookworm: resolved (fixed in 5.15.15-1)
bullseye: resolved (fixed in 5.10.92-1)
forky: resolved (fixed in 5.15.15-1)
sid: resolved (fixed in 5.15.15-1)
trixie: resolved (fixed in 5.15.15-1)
OSV
linux-azure-5.13, linux-oracle-5.13 vulnerabilities
osv·2022-04-06·CVSS 6.5
CVE-2022-23222 [MEDIUM] linux-azure-5.13, linux-oracle-5.13 vulnerabilities
linux-azure-5.13, linux-oracle-5.13 vulnerabilities
It was discovered that the BPF verifier in the Linux kernel did not
properly restrict pointer types in certain situations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-23222)
It was discovered that the network traffic control implementation in the
Linux kernel contained a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-1055)
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022
OSV
linux, linux-aws, linux-aws-5.13, linux-gcp, linux-gcp-5.13, linux-hwe-5.13, linux-kvm, linux-oracle, linux-raspi vulnerabilities
osv·2022-03-22·CVSS 6.5
CVE-2022-23222 [MEDIUM] linux, linux-aws, linux-aws-5.13, linux-gcp, linux-gcp-5.13, linux-hwe-5.13, linux-kvm, linux-oracle, linux-raspi vulnerabilities
linux, linux-aws, linux-aws-5.13, linux-gcp, linux-gcp-5.13, linux-hwe-5.13, linux-kvm, linux-oracle, linux-raspi vulnerabilities
It was discovered that the BPF verifier in the Linux kernel did not
properly restrict pointer types in certain situations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2022-23222)
Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the
Linux kernel did not properly restrict access to the cgroups v1
release_agent feature. A local attacker could use this to gain
administrative privileges. (CVE-2022-0492)
Jürgen Groß discovered that the Xen subsystem within the Linux kernel did
not adequately limit the number of events driver domains (unprivileged PV
backends) could send to
GHSA
GHSA-wj6w-52qh-v4q5: The check_alu_op() function in kernel/bpf/verifier
ghsa_unreviewed·2022-02-12
CVE-2021-45402 [MEDIUM] CWE-668 GHSA-wj6w-52qh-v4q5: The check_alu_op() function in kernel/bpf/verifier
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."
OSV
CVE-2021-45402: The check_alu_op() function in kernel/bpf/verifier
osv·2022-02-11·CVSS 5.5
CVE-2021-45402 [MEDIUM] CVE-2021-45402: The check_alu_op() function in kernel/bpf/verifier
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."
No detection rules found.
No public exploits indexed.
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3cf2b61eb06765e27fec6799292d9fb46d0b7e60https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b1a7288dedc6caf9023f2676b4f5ed34cf0d4029https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e572ff80f05c33cd0cb4860f864f5c9c044280b6https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3cf2b61eb06765e27fec6799292d9fb46d0b7e60https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b1a7288dedc6caf9023f2676b4f5ed34cf0d4029https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e572ff80f05c33cd0cb4860f864f5c9c044280b6
2022-02-11
Published