Use-after-free in Linux kernel - CVE-2026-64534

Vulnerability identifier: #VU139847

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64534

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in nvmet_tcp_try_recv_ddgst() when processing a command with a data digest mismatch after request initialization previously failed. A remote attacker can send a specially crafted request to cause a denial of service.

The issue can lead to a refcount underflow, kernel warnings, and a permanent workqueue deadlock.

Linux kernel
Debian Linux
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Ubuntu
openEuler
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-realtime (Ubuntu package)
linux-fips (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-gke (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-tools
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-zfcpdump-modules (Red Hat package)
kernel-64k-devel-matched (Red Hat package)
kernel-64k-devel (Red Hat package)
kernel-64k-debuginfo (Red Hat package)
kernel-64k-debug-devel-matched (Red Hat package)
kernel-64k-debug-devel (Red Hat package)
kernel-debuginfo-common-ppc64le (Red Hat package)
kernel-zfcpdump-modules-extra (Red Hat package)
kernel-zfcpdump-modules-core (Red Hat package)
python3-perf (Red Hat package)
kernel-zfcpdump-devel-matched (Red Hat package)
kernel-zfcpdump-devel (Red Hat package)
kernel-zfcpdump-core (Red Hat package)
kernel-zfcpdump (Red Hat package)
kernel-debuginfo-common-s390x (Red Hat package)
rv (Red Hat package)
rtla (Red Hat package)
kernel-rt-modules-extra (Red Hat package)
kernel-rt-64k-debug-modules-extra (Red Hat package)
libperf (Red Hat package)
kernel-tools-libs-devel (Red Hat package)
kernel-cross-headers (Red Hat package)
kernel-rt-64k-modules-extra (Red Hat package)
kernel-rt-64k-modules-core (Red Hat package)
kernel-rt-64k-modules (Red Hat package)
kernel-rt-64k-devel (Red Hat package)
kernel-rt-64k-debuginfo (Red Hat package)
kernel-debuginfo-common-aarch64 (Red Hat package)
kernel-rt-64k-debug-modules-core (Red Hat package)
kernel-rt-64k-debug-modules (Red Hat package)
kernel-rt-64k-debug-devel (Red Hat package)
kernel-rt-64k-debug-debuginfo (Red Hat package)
kernel-rt-64k-debug-core (Red Hat package)
kernel-rt-64k-debug (Red Hat package)
kernel-rt-64k-core (Red Hat package)
kernel-rt-64k (Red Hat package)
kernel-debug-uki-virt (Red Hat package)
kernel-modules-extra-matched (Red Hat package)
kernel-modules-extra (Red Hat package)
kernel-modules-core (Red Hat package)
kernel-modules (Red Hat package)
kernel-headers (Red Hat package)
kernel-devel-matched (Red Hat package)
kernel-devel (Red Hat package)
kernel-debuginfo-common-x86_64 (Red Hat package)
kernel-debuginfo (Red Hat package)
kernel-uki-virt-addons (Red Hat package)
kernel-debug-modules-extra (Red Hat package)
kernel-debug-modules-core (Red Hat package)
kernel-debug-modules (Red Hat package)
kernel-debug-devel-matched (Red Hat package)
kernel-debug-devel (Red Hat package)
kernel-debug-debuginfo (Red Hat package)
kernel-debug-core (Red Hat package)
kernel-debug (Red Hat package)
kernel-rt-core (Red Hat package)
perf (Red Hat package)
kernel-uki-virt (Red Hat package)
kernel-tools-libs (Red Hat package)
kernel-tools-debuginfo (Red Hat package)
kernel-tools (Red Hat package)
kernel-rt-modules-core (Red Hat package)
kernel-rt-modules (Red Hat package)
kernel-rt-devel (Red Hat package)
kernel-rt-debuginfo (Red Hat package)
kernel-rt-debug-modules-extra (Red Hat package)
kernel-rt-debug-modules-core (Red Hat package)
kernel-rt-debug-modules (Red Hat package)
kernel-rt-debug-devel (Red Hat package)
kernel-rt-debug-debuginfo (Red Hat package)
kernel-rt-debug-core (Red Hat package)
kernel-rt-debug (Red Hat package)
linux-nvidia (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux (Debian package)
linux-oracle-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia-tegra (Ubuntu package) - addressed in versions 5.15.0-1070.72, 6.8.0-1035.38
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - addressed in versions 5.15.0-195.205~20.04.1, 5.15.0-195.205, 5.15.0-198.208~20.04.1, 5.15.0-198.208+fips1, 5.15.0-1080.84, 5.15.0-1100.108, 5.15.0-1109.111, 5.15.0-1109.114, 5.15.0-1111.115~20.04.1, 5.15.0-1111.115, 5.15.0-1112.118~20.04.1, 5.15.0-1112.118, 5.15.0-1113.119, 5.15.0-1114.120, 5.15.0-1116.125~20.04.1, 5.15.0-1117.124~20.04.1, 5.15.0-1117.124, 5.15.0-1117.124+fips1, 5.15.0-1122.131~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1123.132, 5.15.0-1123.132+fips1, 5.15.0.195.160, 5.15.0.195.205~20.04.1, 5.15.0.198.114, 5.15.0.198.171, 5.15.0.198.208~20.04.1, 5.15.0.1080.83~20.04.1, 5.15.0.1100.99, 5.15.0.1109.105, 5.15.0.1109.113, 5.15.0.1111.108, 5.15.0.1111.115~20.04.1, 5.15.0.1112.111, 5.15.0.1112.118~20.04.1, 5.15.0.1113.112, 5.15.0.1114.110, 5.15.0.1116.120, 5.15.0.1117.113, 5.15.0.1117.120, 5.15.0.1117.124~20.04.1, 5.15.0.1122.131~20.04.1, 5.15.0.1123.107, 5.15.0.1123.121, 5.15.0.1123.132~20.04.1, 6.8.0-147.147, 7.0.0-34.34~24.04.1, 7.0.0-34.34, 7.0.0-34.34.1, 7.0.0-1012.12~24.04.1, 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14, 7.0.0-1020.20
linux-lowlatency (Ubuntu package) - update to 6.8.0-147.147.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1071.79, 7.0.0-1016.16, 7.0.0-1017.17
linux-gcp (Ubuntu package) - addressed in versions 5.15.0-1118.128, 5.15.0-1118.128+fips1, 5.15.0.1118.107, 5.15.0.1118.115, 6.8.0-1071.79, 7.0.0-1013.13~24.04.1, 7.0.0-1013.13, 7.0.0-1014.14
linux-aws (Ubuntu package) - update to 6.8.0-1067.70
linux-ibm (Ubuntu package) - update to 6.8.0-1067.68
linux-oracle (Ubuntu package) - update to 6.8.0-1064.67
linux-azure-fde (Ubuntu package) - addressed in versions 5.15.0-1122.131, 5.15.0.1122.131, 6.8.0-1069.76
linux-realtime (Ubuntu package) - update to 6.8.1-1062.63
linux-fips (Ubuntu package) - update to 6.8.0-147.147+fips1
linux-gkeop (Ubuntu package) - update to 6.8.0-1052.56
linux-gke (Ubuntu package) - addressed in versions 6.8.0-1066.74, 7.0.0-1007.8
linux-azure-fips (Ubuntu package) - update to 6.8.0-1071.79+fips1
linux-aws-fips (Ubuntu package) - update to 6.8.0-1067.70+fips1
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1071.79+fips1
kernel (Red Hat package) - addressed in versions 4.18.0-553.166.1.el8_10, 5.14.0-687.51.1.el9_8
kernel-rt (Red Hat package) - addressed in versions 4.18.0-553.166.1.rt7.507.el8_10, 6.12.0-211.58.1.el10_2
kernel-tools - update to 5.10.0-328.0.0.229
python3-perf-debuginfo - update to 5.10.0-328.0.0.229
python3-perf - update to 5.10.0-328.0.0.229
perf-debuginfo - update to 5.10.0-328.0.0.229
perf - update to 5.10.0-328.0.0.229
kernel-tools-devel - update to 5.10.0-328.0.0.229
kernel-tools-debuginfo - update to 5.10.0-328.0.0.229
kernel-source - update to 5.10.0-328.0.0.229
kernel-headers - update to 5.10.0-328.0.0.229
kernel-devel - update to 5.10.0-328.0.0.229
kernel-debugsource - update to 5.10.0-328.0.0.229
kernel-debuginfo - update to 5.10.0-328.0.0.229
bpftool-debuginfo - update to 5.10.0-328.0.0.229
bpftool - update to 5.10.0-328.0.0.229
kernel - update to 5.10.0-328.0.0.229
kernel-zfcpdump-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debug-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-64k-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-ppc64le (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
python3-perf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-zfcpdump (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-s390x (Red Hat package) - update to 6.12.0-211.58.1.el10_2
rv (Red Hat package) - update to 6.12.0-211.58.1.el10_2
rtla (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
libperf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-libs-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-cross-headers (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-aarch64 (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-64k (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-uki-virt (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-extra-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-headers (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo-common-x86_64 (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-uki-virt-addons (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-devel-matched (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
perf (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-uki-virt (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-libs (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-tools (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules-extra (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-modules (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-devel (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-debuginfo (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug-core (Red Hat package) - update to 6.12.0-211.58.1.el10_2
kernel-rt-debug (Red Hat package) - update to 6.12.0-211.58.1.el10_2
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-oracle-5.15 (Ubuntu package) - addressed in versions 5.15.0-1114.120~20.04.1, 5.15.0.1114.120~20.04.1
linux-gcp-5.15 (Ubuntu package) - addressed in versions 5.15.0-1118.128~20.04.1, 5.15.0.1118.128~20.04.1
linux (Debian package) - update to 6.12.100-1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1012.12~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

• https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
• https://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f
• https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8
• https://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e
• https://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b
• https://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc
• https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1

• Use-after-free in Linux kernel nvme target driver
• Debian update for linux
• openEuler 22.03 LTS SP4 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 10 update for kernel
• Red Hat Enterprise Linux 9 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Ubuntu update for linux-gcp
• Ubuntu update for linux
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux-gke
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-azure
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-gcp
• Ubuntu update for linux-gcp-5.15
• Ubuntu update for linux-oracle-5.15
• Ubuntu update for linux
• Ubuntu update for linux, linux-aws, linux-aws-fips and more
• Ubuntu update for linux-azure, linux-azure-fde, linux-azure-fips
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx