Vulnerability · Published Aug 21, 2026 · Assigned by Linux

CVE-2026-74581net: ipv6: clear suppressed fib6 rule result

Critical 9.8

In plain English

A critical-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 63.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info. If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release(). Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:10kernel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-abi-stablelists6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-abi-stablelists4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-abi-stablelists5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-core4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-cross-headers6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-cross-headers4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-cross-headers5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-debug4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-debug5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-debug-core4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-debug-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-debug-devel4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-debug-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-debug-modules4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-debug-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-debug-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-devel4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-devel-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-devel-matched5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-doc6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-doc4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-doc5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-headers6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-headers4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-headers5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-modules4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-modules-extra4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:10kernel-rt6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-core4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-debug4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-debug5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-debug-core4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-debug-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-devel4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-modules4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-rt-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.159.1.rt7.500.el8_10ALSA-2026:63013
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-tools6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-tools4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-tools5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-tools-libs6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-tools-libs4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-tools-libs5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-uki-virt6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-uki-virt5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-zfcpdump4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-zfcpdump5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10libperf6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9libperf5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10perf6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8perf4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9perf5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10python3-perf6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:8python3-perf4.18.0-553.159.1.el8_10ALSA-2026:63014
AlmaLinux:9python3-perf5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10rtla6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9rtla5.14.0-687.42.1.el9_8ALSA-2026:59723
AlmaLinux:10rv6.12.0-211.51.1.el10_2ALSA-2026:63128
AlmaLinux:9rv5.14.0-687.42.1.el9_8ALSA-2026:59723
Debian:12linux6.1.187-1DEBIAN-CVE-2026-74581
Debian:13linux6.12.105-1DEBIAN-CVE-2026-74581
Debian:14linux7.1.8-1DEBIAN-CVE-2026-74581
Debian:12linux-6.126.12.107-1~deb12u1DEBIAN-CVE-2026-74581
Rocky Linux:10kernel0:6.12.0-211.51.1.el10_2RLSA-2026:63128
Rocky Linux:8kernel0:4.18.0-553.159.1.el8_10RLSA-2026:63014
Rocky Linux:9kernel0:5.14.0-687.42.1.el9_8RLSA-2026:59723
Rocky Linux:8kernel-rt0:4.18.0-553.159.1.rt7.500.el8_10RLSA-2026:63013
Ubuntu:22.04:LTSlinux5.15.0-198.208UBUNTU-CVE-2026-74581
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-74581
Ubuntu:26.04:LTSlinux7.0.0-42.42UBUNTU-CVE-2026-74581
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-74581
Ubuntu:22.04:LTSlinux-aws5.15.0-1117.124UBUNTU-CVE-2026-74581
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-74581
Ubuntu:26.04:LTSlinux-aws7.0.0-1016.17UBUNTU-CVE-2026-74581
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-74581

Affected products (as reported)

VendorProductVersions
Linux Linux 209d35ee34e25f9668c404350a1c86d914c54ffa – before 90c57310e266eb94e4a80d6b15a9ca131d2e82cb8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 – before 5d29b286c9de0b309e94b9ed083aa1a2f429434fcdef485217d30382f3bf6448c54b4401648fe3f1 – before 354db6243eca59e9d187ffbf8b7955b044ce84dccdef485217d30382f3bf6448c54b4401648fe3f1 – before 6d98c70fe0ba8c7708bfd5b2a5174d2086775daacdef485217d30382f3bf6448c54b4401648fe3f1 – before 9bad152c42b37499162367fe47867411e62fffa3cdef485217d30382f3bf6448c54b4401648fe3f1 – before dc3ab04220667f254f4348572b2a0b3febff89fbcdef485217d30382f3bf6448c54b4401648fe3f1 – before a341c091ca0bfae377747b1b59a3bd8ebe18a937cdef485217d30382f3bf6448c54b4401648fe3f1 – before 6aea62e433fe1b586202a5fee8b5807ce635e1d7
Linux Linux 5.16

References