In the Linux kernel, the following vulnerability has been resolved:
mm/slab: return NULL early from kmalloc_nolock() in NMI on UP
On UP kernels (!CONFIG_SMP), spin_trylock() is a no-op that unconditionally succeeds even when the lock is already held. As a result, kmalloc_nolock() called from NMI context can re-enter the slab allocator and acquire n->list_lock that the interrupted context is already holding, corrupting slab state.
With CONFIG_DEBUG_SPINLOCK on UP, the following BUG is triggered with the slub_kunit test module:
BUG: spinlock trylock failure on UP on CPU#0, kunit_try_catch/243 [...] Call Trace: <NMI> dump_stack_lvl+0x3f/0x60 do_raw_spin_trylock+0x41/0x50 _raw_spin_trylock+0x24/0x50 get_from_partial_node+0x120/0x4d0 ___slab_alloc+0x8a/0x4c0 kmalloc_nolock_noprof+0x164/0x310 [...] </NMI>
Fix this by returning NULL early when invoked from NMI on a UP kernel.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.18-modules-extraUpgrade kernel6.18-develUpgrade kernel6.18-toolsUpgrade kernel6.18-tools-develUpgrade kernel6.18-headersUpgrade kernel-livepatch-6.18.30-61.116Upgrade kernel6.18-debuginfoUpgrade kernel6.18-debuginfo-common-x86_64Upgrade kernel6.18Upgrade bpftool6.18-debuginfoUpgrade bpftool6.18Upgrade kernel6.18-debuginfo-common-aarch64Upgrade python3-perf6.18-debuginfoUpgrade kernel6.18-tools-debuginfoUpgrade perf6.18Upgrade kernel6.18-modules-extra-commonUpgrade python3-perf6.18Upgrade perf6.18-debuginfo | Jun 23, 2026 | May 27, 2026 |
| Ubuntu | — | Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-ibm-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-7.0.0-1007-oracleUpgrade linux-image-7.0.0-1014-raspi-realtimeUpgrade linux-image-7.0.0-1013-nvidia-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-virtualUpgrade linux-image-raspi-realtimeUpgrade linux-image-nvidiaUpgrade linux-image-7.0.0-1013-nvidiaUpgrade linux-image-oracle-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-raspiUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1008-oemUpgrade linux-image-generic-64k-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-aws-64kUpgrade linux-image-oem-24.04Upgrade linux-image-7.0.0-1007-gcp-64kUpgrade linux-image-oracle-64kUpgrade linux-image-oem-24.04aUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-27-realtime-64kUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-azureUpgrade linux-image-genericUpgrade linux-image-7.0.0-1007-gcpUpgrade linux-image-gcpUpgrade linux-image-7.0.0-27-realtimeUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-generic-64kUpgrade linux-image-oem-24.04dUpgrade linux-image-ibmUpgrade linux-image-gcp-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-azure-fde-7.0Upgrade linux-image-oracleUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-1009-ibmUpgrade linux-image-aws-64k-7.0Upgrade linux-image-awsUpgrade linux-image-realtime-7.0Upgrade linux-image-realtime-64k-7.0Upgrade linux-image-realtime-64kUpgrade linux-image-7.0.0-1008-awsUpgrade linux-image-7.0.0-1014-raspiUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-nvidia-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-realtimeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-27-genericUpgrade linux-image-aws-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oem-26.04aUpgrade linux-image-7.0.0-27-generic-64kUpgrade linux-image-azure-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-7.0.0-1007-oracle-64kUpgrade linux-image-oem-24.04bUpgrade linux-image-generic-7.0Upgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-1008-aws-64kUpgrade linux-image-oem-24.04c | Jul 1, 2026 | May 27, 2026 |
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