High 7.0Published May 27, 2026

CVE-2026-46029mm/slab: return NULL early from kmalloc_nolock() in NMI on UP

Updated under an hour ago (Oct 26, 2026, 7:10 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.0 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from af92793e52c3a99b828ed4bdd277fd3e11c18d08 before a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7; from af92793e52c3a99b828ed4bdd277fd3e11c18d08 before d66553204a15bdb257d9ef8aca1e12f5fbb910b2; from af92793e52c3a99b828ed4bdd277fd3e11c18d08 before 5b31044e649e3e54c2caef135c09b371c2fbcd08	CNA record
linux linux_kernel linux:linux_kernel	from 6.18 before 6.18.27; from 6.19 before 7.0.4; 7.1	NVD

References

References

https://git.kernel.org/stable/c/a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7	patch
https://git.kernel.org/stable/c/d66553204a15bdb257d9ef8aca1e12f5fbb910b2	patch
https://git.kernel.org/stable/c/5b31044e649e3e54c2caef135c09b371c2fbcd08	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.