Vulnerability · Published Jul 19, 2026 · Assigned by Linux

CVE-2026-63919xfrm: input: hold netns during deferred transport reinjection

High 8.8

In plain English

A high-severity use-after-free 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 0.7% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 48.6% 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: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net().

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:10kernel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-abi-stablelists6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-abi-stablelists4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-abi-stablelists5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-cross-headers6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-cross-headers4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-cross-headers5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-debug4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-debug5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-debug-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-debug-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-debug-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-debug-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-debug-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-debug-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-debug-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-devel-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-devel-matched5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-doc6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-doc4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-doc5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-headers6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-headers4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-headers5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:10kernel-rt6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-core4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-debug4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-debug5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-debug-core4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-debug-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-devel4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-modules4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-rt-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.164.1.rt7.505.el8_10ALSA-2026:68532
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-tools6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-tools4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-tools5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-tools-libs6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-tools-libs4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-tools-libs5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-uki-virt6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-uki-virt5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-zfcpdump4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-zfcpdump5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10libperf6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9libperf5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10perf6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8perf4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9perf5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10python3-perf6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:8python3-perf4.18.0-553.164.1.el8_10ALSA-2026:68531
AlmaLinux:9python3-perf5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10rtla6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9rtla5.14.0-687.49.1.el9_8ALSA-2026:68570
AlmaLinux:10rv6.12.0-211.55.1.el10_2ALSA-2026:67471
AlmaLinux:9rv5.14.0-687.49.1.el9_8ALSA-2026:68570
Debian:12linux6.1.176-1DEBIAN-CVE-2026-63919
Debian:13linux6.12.94-1DEBIAN-CVE-2026-63919
Debian:14linux7.0.12-1DEBIAN-CVE-2026-63919
Rocky Linux:10kernel0:6.12.0-211.55.1.el10_2RLSA-2026:67471
Rocky Linux:8kernel0:4.18.0-553.164.1.el8_10RLSA-2026:68531
Rocky Linux:9kernel0:5.14.0-687.49.1.el9_8RLSA-2026:68570
Rocky Linux:8kernel-rt0:4.18.0-553.164.1.rt7.505.el8_10RLSA-2026:68532
Ubuntu:22.04:LTSlinux5.15.0-198.208UBUNTU-CVE-2026-63919
Ubuntu:24.04:LTSlinux6.8.0-146.146UBUNTU-CVE-2026-63919
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-63919
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-63919
Ubuntu:22.04:LTSlinux-aws5.15.0-1117.124UBUNTU-CVE-2026-63919
Ubuntu:24.04:LTSlinux-aws6.8.0-1066.69UBUNTU-CVE-2026-63919
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-63919
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-63919
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-63919

Affected products (as reported)

VendorProductVersions
Linux Linux 7b3801927e52f8621de311277f7fc727635019e7 – before 7ee59eda8820b758ed29e1cd3222359c7b97302c7b3801927e52f8621de311277f7fc727635019e7 – before 2df7059a18afb7d3aee6c36cad5d371c198111d47b3801927e52f8621de311277f7fc727635019e7 – before 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa7b3801927e52f8621de311277f7fc727635019e7 – before 48ce101cd630d6745b6923b5bad8358bc4c119da7b3801927e52f8621de311277f7fc727635019e7 – before 55ddfc41451f01c588089cd74957a05311b6f2027b3801927e52f8621de311277f7fc727635019e7 – before 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e7b3801927e52f8621de311277f7fc727635019e7 – before 9f67a36e91bb50d358760f381f233913fe5c09f87b3801927e52f8621de311277f7fc727635019e7 – before c16f74dc1d75d0e2e7670076d5375deda110ebeb
Linux Linux 5.6

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References