CVE-2026-46029
Published: May 27, 2026
Modified: May 30, 2026
CVSS v3.1
7.0
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.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 - < a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 - < d66553204a15bdb257d9ef8aca1e12f5fbb910b2affected af92793e52c3a99b828ed4bdd277fd3e11c18d08 - < 5b31044e649e3e54c2caef135c09b371c2fbcd08 |
Linux | Linux | affected 6.18unaffected 0 - < 6.18unaffected 6.18.27 - <= 6.18.*unaffected 7.0.4 - <= 7.0.*unaffected 7.1-rc2 - <= * |
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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