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Vulnerability · Published Jun 24, 2026 · Assigned by Linux

CVE-2026-53026NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg

High 7.5

In plain English

A high-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)7.5High
Exploit odds (30 days)0.4%top 62.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg In nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONLY] is already set by another thread, __nfs4_file_get_access should not be called to increment the nfs4_file access count since that was already done by the thread that added READ access to the file. The extra fi_access count in nfs4_file can prevent the corresponding nfsd_file from being freed. When stopping nfs-server service, these extra access counts trigger a BUG in kmem_cache_destroy() that shows nfsd_file object remaining on __kmem_cache_shutdown. This problem can be reproduced by running the Git project's test suite over NFS.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-abi-stablelists6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-cross-headers6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-devel-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-doc6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-headers6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-tools6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-tools-libs6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-uki-virt6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10libperf6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10perf6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10python3-perf6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10rtla6.12.0-211.50.1.el10_2ALSA-2026:61887
AlmaLinux:10rv6.12.0-211.50.1.el10_2ALSA-2026:61887
Debian:14linux7.0.10-1DEBIAN-CVE-2026-53026
Rocky Linux:10kernel0:6.12.0-211.50.1.el10_2RLSA-2026:61887
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux7.0.0-28.28UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-aws7.0.0-1009.9UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-azure7.0.0-1010.10UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1009.9UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-gcp7.0.0-1008.8UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-gke7.0.0-1003.4UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-hwe-7.07.0.0-28.28~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-ibm7.0.0-1010.10UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-nvidia7.0.0-1016.16UBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-nvidia-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-nvidia-7.07.0.0-1016.16~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-nvidia-bos7.0.0-2016.16UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-oem-7.07.0.0-1009.9UBUNTU-CVE-2026-53026
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-oracle7.0.0-1008.8UBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-oracle-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-53026
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-raspi7.0.0-1015.15UBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-realtime7.0.0-28.28.1UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-53026
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-53026
Ubuntu:26.04:LTSlinux-riscv7.0.0-28.28.1UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-53026
Ubuntu:24.04:LTSlinux-riscv-7.07.0.0-28.28.1~24.04.3UBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-53026
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-53026

Affected products (as reported)

VendorProductVersions
Linux Linux c07dc84ed67c5a182273171639bacbbb87c12175 – before 4584229395d0d65bd517780afe97ffea07cb2c3d8072e34e1387d03102b788677d491e2bcceef6f5 – before b81572b073441dfd32213e41857676d0dbff46658072e34e1387d03102b788677d491e2bcceef6f5 – before b48f44f36e6607b2f818560f19deb86b4a9c717b6.18.4 – before 6.18.33
Linux Linux 6.19

References