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CVE PROGRAM SOURCE RECORD7.0 High

CVE-2026-46029

mm/slab: return NULL early from kmalloc_nolock() in NMI on UP

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • af92793e52c3a99b828ed4bdd277fd3e11c18d08 to < a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7affected
  • af92793e52c3a99b828ed4bdd277fd3e11c18d08 to < d66553204a15bdb257d9ef8aca1e12f5fbb910b2affected
  • af92793e52c3a99b828ed4bdd277fd3e11c18d08 to < 5b31044e649e3e54c2caef135c09b371c2fbcd08affected

Linux Linux

Default version status: affected

  • 6.18affected
  • 0 to < 6.18unaffected
  • 6.18.27 to ≤ 6.18.*unaffected
  • 7.0.4 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References