CVE-2026-46029

HIGH EPSS 4.0%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
7.0 CVSS 3.1
High
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.0
Exploitability
1.0
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
4.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 3

VendorProductVersionRange
linuxlinux_kernel*≥6.18  –  <6.18.27
linuxlinux_kernel*≥6.19  –  <7.0.4
linuxlinux_kernel7.1any

References 3

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

Remediation

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