Vulnerability · Published Jul 24, 2026 · Assigned by Linux

CVE-2026-64255wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers

High 8.8

In plain English

A high-severity out-of-bounds read 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 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 80.3% 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: wifi: iwlwifi: mld: validate sta_mask before ffs() in BA session handlers Three BA session handlers use ffs(ba_data->sta_mask) - 1 to derive a station ID without checking that sta_mask is non-zero. When sta_mask is zero, ffs() returns 0 and the subtraction wraps to 0xFFFFFFFF, causing an out-of-bounds access on fw_id_to_link_sta[]. Add WARN_ON_ONCE(!ba_data->sta_mask) guards before each ffs() call, consistent with the existing check in iwl_mld_ampdu_rx_start().

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10kernel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-devel-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-debug-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-devel-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-devel-matched5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-64k-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-64k-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-abi-stablelists6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-abi-stablelists5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-cross-headers6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-cross-headers5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-devel-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-devel-matched5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-debug-uki-virt6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-debug-uki-virt5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-devel-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-devel-matched5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-doc6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-doc5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-headers6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-headers5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-modules-extra-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:10kernel-rt6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-debug-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-64k-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-debug-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-rt-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-rt-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-tools6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-tools5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-tools-libs6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-tools-libs5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-tools-libs-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-tools-libs-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-uki-virt6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-uki-virt5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-uki-virt-addons6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-uki-virt-addons5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-devel6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-devel5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-devel-matched6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-modules6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-modules5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-modules-core6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10kernel-zfcpdump-modules-extra6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10libperf6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9libperf5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10perf6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9perf5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10python3-perf6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9python3-perf5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10rtla6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9rtla5.14.0-687.47.1.el9_8ALSA-2026:67150
AlmaLinux:10rv6.12.0-211.53.1.el10_2ALSA-2026:65334
AlmaLinux:9rv5.14.0-687.47.1.el9_8ALSA-2026:67150
Debian:13linuxno fix listedDEBIAN-CVE-2026-64255
Debian:14linux7.1.3-1DEBIAN-CVE-2026-64255
Rocky Linux:10kernel0:6.12.0-211.53.1.el10_2RLSA-2026:65334
Rocky Linux:9kernel0:5.14.0-687.47.1.el9_8RLSA-2026:67150
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux7.0.0-31.31UBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux-aws7.0.0-1012.12UBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-aws-7.07.0.0-1012.12~24.04.1UBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux-azure7.0.0-1014.14UBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-7.07.0.0-1014.14~24.04.1UBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux-azure-fde7.0.0-1013.13UBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-fde-7.07.0.0-1013.13~24.04.1UBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux-gcp7.0.0-1011.11UBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gcp-7.07.0.0-1011.11~24.04.1UBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-64255
Ubuntu:26.04:LTSlinux-gke7.0.0-1006.7UBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-64255
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-64255
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-64255

Affected products (as reported)

VendorProductVersions
Linux Linux 9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b – before 1de92789ce31e46fa7e7d8e89c90b19cdb1c103b9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b – before fe7f339f63c9dc4ca546ed7ac38ba4bb3a99dcfc9aa3856d9b6f3f8bf085b5bbb5f3703578bf452b – before f056fc2b927448d37eca6b6cacc3d1b0f67b20d2
Linux Linux 6.4

Weakness: CWE-125 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References