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In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: avoid invalid memory access via node_online(NUMA_NO_NODE)
KASAN reports:
[ 4.668325][ T0] BUG: KASAN: wild-memory-access in dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497) [ 4.676149][ T0] Read of size 8 at addr 1fffffff85115558 by task swapper/0/0 [ 4.683454][ T0] [ 4.685638][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-00004-g0e862838f290 #1 [ 4.694331][ T0] Hardware name: Supermicro SYS-5018D-FN4T/X10SDV-8C-TLN4F, BIOS 1.1 03/02/2016 [ 4.703196][ T0] Call Trace: [ 4.706334][ T0] <TASK> [ 4.709133][ T0] ? dmar_parse_one_rhsa (arch/x86/include/asm/bitops.h:214 arch/x86/include/asm/bitops.h:226 include/asm-generic/bitops/instrumented-non-atomic.h:142 include/linux/nodemask.h:415 drivers/iommu/intel/dmar.c:497)
after converting the type of the first argument (@nr, bit number) of arch_test_bit() from `long` to `unsigned long`[0].
Under certain conditions (for example, when ACPI NUMA is disabled via command line), pxm_to_node() can return %NUMA_NO_NODE (-1). It is valid 'magic' number of NUMA node, but not valid bit number to use in bitops. node_online() eventually descends to test_bit() without checking for the input, assuming it's on caller side (which might be good for perf-critical tasks). There, -1 becomes %ULONG_MAX which leads to an insane array index when calculating bit position in memory.
For now, add an explicit check for @node being not %NUMA_NO_NODE before calling test_bit(). The actual logics didn't change here at all.
[0] https://github.com/norov/linux/commit/0e862838f290147ea9c16db852d8d494b552d38d
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-debuginfoUpgrade perfUpgrade kernel-livepatch-5.15.69-37.134Upgrade kernel-tools-debuginfoUpgrade python-perf-debuginfoUpgrade perf-debuginfoUpgrade kernel-livepatch-5.10.144-127.601Upgrade bpftoolUpgrade python-perfUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-tools | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernelUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-tools-libs | Sep 15, 2025 | Sep 9, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-tools-libsUpgrade python3-perfUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools | Feb 3, 2026 | Jan 30, 2026 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 18, 2025 |
| Ubuntu | — | Upgrade linux-gcp-fipsUpgrade linux-raspi-5.4Upgrade linux-oracleUpgrade linux-aws-fipsUpgrade linux-kvmUpgrade linux-azure-5.15Upgrade linux-ibm-5.4Upgrade linux-intel-iotgUpgrade linux-bluefieldUpgrade linux-ibmUpgrade linux-gcpUpgrade linuxUpgrade linux-azure-5.4Upgrade linux-gcp-5.4Upgrade linux-hwe-5.4Upgrade linux-awsUpgrade linux-riscv-5.15Upgrade linux-azure-fipsUpgrade linux-iotUpgrade linux-gkeopUpgrade linux-lowlatency-hwe-5.15Upgrade linux-fipsUpgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-nvidiaUpgrade linux-oracle-5.4Upgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-gkeUpgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-azure-fdeUpgrade linux-aws-5.15Upgrade linux-lowlatencyUpgrade linux-realtimeUpgrade linux-azure | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 18, 2025 |
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