CVE-2026-43091

linux: In the Linux kernel, the following vulnerability has been resolved: xfrm: Wait for RCU readers during policy netns e...

CVE-2026-43091 is fixed in 105 products on 1 platform, first by ALAS2023-2026-1695, released May 8, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.8
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0013
2nd percentile

In the Linux kernel, the following vulnerability has been resolved: xfrm: Wait for RCU readers during policy netns exit xfrm_policy_fini() frees the policy_bydst hash tables after flushing the policy work items and deleting all policies, but it does not wait for concurrent RCU readers to leave their read-side critical sections first. The policy_bydst tables are published via rcu_assign_pointer() and are looked up through rcu_dereference_check(), so netns teardown must also wait for an RCU grace period before freeing the table memory. Fix this by adding synchronize_rcu() before freeing the policy hash tables.

Where it's fixed

ProductFixed inFixReleased
Linux
bpftool · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
bpftool-debuginfo · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
bpftool6.12 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
bpftool6.12-debuginfo · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
bpftool6.18 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
bpftool6.18-debuginfo · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
dtb-aarch64 · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-64kb · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-64kb · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-64kb · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-azure · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-azure · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-azure · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-debuginfo · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-debuginfo-common-aarch64 · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-debuginfo-common-x86_64 · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-default · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-default · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-default · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23237-1 Aug 11, 2026
kernel-default-base · opensuse-leap 16.0 6.12.0-160000.37.1.160000.2.19 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-default-base · sles 15.7 6.4.0-150700.53.87.3.150700.17.49.2 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-default-base · sles 16.0 6.12.0-160000.37.1.160000.2.19 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-devel · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-docs · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-docs · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-docs · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-headers · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-kvmsmall · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-kvmsmall · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-livepatch-6.1.177-224.371 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-livepatch-6.12.83-113.160 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel-livepatch-6.18.25-55.108 · amzn 2023 1:1.0-0.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel-livepatch-SLE15-SP7-RT_Update_22 · sles 15.7 1-150700.1.3.1 SUSE-SU-2026:4940-1 Nov 7, 2026
kernel-livepatch-SLE15-SP7_Update_23 · sles 15.7 1-150700.15.3.2 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-modules-extra · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-modules-extra-common · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-obs-build · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-obs-build · sles 15.7 6.4.0-150700.53.87.2 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-obs-qa · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-obs-qa · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-rt · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-source · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-source · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-source · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-syms · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-syms · sles 15.7 6.4.0-150700.53.87.1 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-syms · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel-tools · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-tools-debuginfo · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-tools-devel · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
kernel-uek · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-debug-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-doc · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-doc · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-tools · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek-tools · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-devel · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-devel · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-core · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-core · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-deprecated · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-deprecated · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-desktop · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-desktop · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra-netfilter · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-extra-netfilter · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-usb · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-usb · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-wireless · ol 10 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-uek64k-modules-wireless · ol 9 0:6.12.0-204.92.4.2.el9uek ELSA-2026-50372 Jul 2, 2026
kernel-zfcpdump · opensuse-leap 16.0 6.12.0-160000.37.1 OPENSUSE-SU-2026:21555-1 Aug 12, 2026
kernel-zfcpdump · sles 15.7 6.4.0-150700.53.87.3 SUSE-SU-2026:4935-1 Nov 7, 2026
kernel-zfcpdump · sles 16.0 6.12.0-160000.37.1 SUSE-SU-2026:23231-1 Aug 11, 2026
kernel6.12 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-debuginfo · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-debuginfo-common-aarch64 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-debuginfo-common-x86_64 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-devel · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-headers · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-modules-extra · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-modules-extra-common · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-tools · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-tools-debuginfo · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.12-tools-devel · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
kernel6.18 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-debuginfo · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-debuginfo-common-aarch64 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-debuginfo-common-x86_64 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-devel · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-headers · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-modules-extra · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-modules-extra-common · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-tools · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-tools-debuginfo · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
kernel6.18-tools-devel · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
linux · Debian 13.5 (trixie) 6.12.85-1 DEBIAN-CVE-2026-43091 May 15, 2026
linux · Debian 14 6.19.14-1 DEBIAN-CVE-2026-43091 May 15, 2026
perf · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
perf-debuginfo · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
perf6.12 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
perf6.12-debuginfo · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
perf6.18 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
perf6.18-debuginfo · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
python3-perf · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
python3-perf-debuginfo · amzn 2023 1:6.1.177-224.371.amzn2023 ALAS2023-2026-2032 Aug 3, 2026
python3-perf6.12 · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
python3-perf6.12-debuginfo · amzn 2023 1:6.12.83-113.160.amzn2023 ALAS2023-2026-1695 May 8, 2026
python3-perf6.18 · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026
python3-perf6.18-debuginfo · amzn 2023 1:6.18.25-55.108.amzn2023 ALAS2023-2026-1693 May 8, 2026

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