Unrated severityNVD Advisory· Published Jun 4, 2021· Updated Sep 16, 2024
Linux kernel eBPF bitwise ops ALU32 bounds tracking
CVE-2021-3490
Description
The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).
Affected products
38- osv-coords37 versionspkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-debug&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-preempt&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/kernel-syms-azure&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/kernel-64kb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-default-base&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP3pkg:rpm/suse/kernel-default&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3pkg:rpm/suse/kernel-docs&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_0&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-livepatch-SLE15-SP3_Update_1&distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015%20SP3pkg:rpm/suse/kernel-obs-build&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-preempt&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3pkg:rpm/suse/kernel-source-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3pkg:rpm/suse/kernel-source&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-syms-azure&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Public%20Cloud%2015%20SP3pkg:rpm/suse/kernel-syms&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3pkg:rpm/suse/kernel-zfcpdump&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3
< 5.3.18-59.5.2+ 36 more
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2.18.2.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.14.6-1.4
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2.18.2.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 2-3.1
- (no CPE)range: < 1-7.5.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-59.5.2
- (no CPE)range: < 5.3.18-38.3.1
- (no CPE)range: < 5.3.18-59.5.1
- (no CPE)range: < 5.3.18-59.5.2
- Linux/Linux kernelv5Range: trunk
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- ubuntu.com/security/notices/USN-4949-1mitrevendor-advisoryx_refsource_UBUNTU
- ubuntu.com/security/notices/USN-4950-1mitrevendor-advisoryx_refsource_UBUNTU
- packetstormsecurity.com/files/164015/Linux-eBPF-ALU32-32-bit-Invalid-Bounds-Tracking-Local-Privilege-Escalation.htmlmitrex_refsource_MISC
- git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/mitrex_refsource_MISC
- security.netapp.com/advisory/ntap-20210716-0004/mitrex_refsource_CONFIRM
- www.openwall.com/lists/oss-security/2021/05/11/11mitremailing-listx_refsource_MLIST
- www.zerodayinitiative.com/advisories/ZDI-21-606/mitrex_refsource_MISC
News mentions
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