Vulnerability · Published May 6, 2026 · Assigned by Linux

CVE-2026-43163md/bitmap: fix GPF in write_page caused by resize race

Medium 4.7

In plain English

A medium-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 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.7Medium
Exploit odds (30 days)<0.1%top 99.6% 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: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over `bitmap->storage.filemap` without locking, while the resize path frees that storage via md_bitmap_file_unmap(). `quiesce()` does not stop the md thread, allowing concurrent access to freed pages. Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:10kernel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-abi-stablelists6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-abi-stablelists4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-abi-stablelists5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-core4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-cross-headers6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-cross-headers4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-cross-headers5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-debug4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-debug5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-debug-core4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-debug-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-debug-devel4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-debug-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-debug-modules4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-debug-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-debug-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-devel4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-devel-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-devel-matched5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-doc6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-doc4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-doc5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-headers6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-headers4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-headers5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-modules4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-modules-extra4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:10kernel-rt6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-core4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-debug4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-debug5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-debug-core4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-debug-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-devel4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-modules4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-rt-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.126.1.rt7.467.el8_10ALSA-2026:21745
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-tools6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-tools4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-tools5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-tools-libs6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-tools-libs4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-tools-libs5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-uki-virt6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-uki-virt5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-zfcpdump4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-zfcpdump5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10libperf6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9libperf5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10perf6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8perf4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9perf5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10python3-perf6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:8python3-perf4.18.0-553.126.1.el8_10ALSA-2026:21706
AlmaLinux:9python3-perf5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10rtla6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9rtla5.14.0-687.10.1.el9_8ALSA-2026:19568
AlmaLinux:10rv6.12.0-211.33.1.el10_2ALSA-2026:38492
AlmaLinux:9rv5.14.0-687.10.1.el9_8ALSA-2026:19568
Debian:12linux6.1.170-1DEBIAN-CVE-2026-43163
Debian:13linux6.12.85-1DEBIAN-CVE-2026-43163
Debian:14linux6.19.6-1DEBIAN-CVE-2026-43163
Rocky Linux:10kernel0:6.12.0-211.33.1.el10_2RLSA-2026:38492
Rocky Linux:8kernel0:4.18.0-553.126.1.el8_10RLSA-2026:21706
Rocky Linux:9kernel0:5.14.0-687.10.1.el9_8.0.1RLSA-2026:19568
Rocky Linux:8kernel-rt0:4.18.0-553.126.1.rt7.467.el8_10RLSA-2026:21745
Ubuntu:22.04:LTSlinux5.15.0-186.196UBUNTU-CVE-2026-43163
Ubuntu:24.04:LTSlinux6.8.0-134.134UBUNTU-CVE-2026-43163
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-43163
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-43163
Ubuntu:22.04:LTSlinux-aws5.15.0-1112.119UBUNTU-CVE-2026-43163
Ubuntu:24.04:LTSlinux-aws6.8.0-1060.63UBUNTU-CVE-2026-43163
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-43163
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-43163
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-43163

Affected products (as reported)

VendorProductVersions
Linux Linux d60b479d177a5735b6b4db6ee5280ef6653f50e7 – before 140cc839fbeb1ddb33a8da8811b716d88d3905b7d60b479d177a5735b6b4db6ee5280ef6653f50e7 – before ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8d60b479d177a5735b6b4db6ee5280ef6653f50e7 – before d3af62411e19752c663fe4f424dbf49d95a4cc7cd60b479d177a5735b6b4db6ee5280ef6653f50e7 – before d92b8fac294b5f915c50e65ce4ae2262e53614ecd60b479d177a5735b6b4db6ee5280ef6653f50e7 – before a437e3bf30e32846079e470c1ba5ee790bccdf89d60b479d177a5735b6b4db6ee5280ef6653f50e7 – before 9a6f8cd28bb9bb6ed86a6df19331fb08016dee7fd60b479d177a5735b6b4db6ee5280ef6653f50e7 – before 5f73c8b33df9a605a591eab72d43a969600c1f8cd60b479d177a5735b6b4db6ee5280ef6653f50e7 – before 46ef85f854dfa9d5226b3c1c46493d79556c9589
Linux Linux 3.5

References