What is CVE-2026-46029?

CVE-2026-46029 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10, affecting Linux kernel versions from 6.18 onward and patched in 6.18.27, 7.0.4 and 7.1-rc2. CVE-2026-46029 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46029?

CVE-2026-46029 has a CVSS score of 7.0 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-46029?

Yes, CVE-2026-46029 has been patched. Fixed versions include 6.18.27, 7.0.4 and 7.1-rc2. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46029 actively exploited?

CVE-2026-46029 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-46029

High

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.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-05-30

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.0

out of 10

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.27, 7.0.4, 7.1-rc2 and their respective stable series.

Affected from

≥ 6.18

Fixed in

✓ 6.18.27 6.18.x ✓ 7.0.4 7.0.x ✓ 7.1-rc2

References

The following references provide additional information about CVE-2026-46029 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

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

Details

CVE ID CVE-2026-46029

Severity High

CVSS score 7.0 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-05-30

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46029?

CVE-2026-46029 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10 . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.27, 7.0.4 and 7.1-rc2. CVE-2026-46029 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46029?

CVE-2026-46029 has a CVSS score of 7.0 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-46029?

Yes — CVE-2026-46029 has been patched. Fixed versions include 6.18.27, 7.0.4 and 7.1-rc2. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46029 actively exploited?

No — CVE-2026-46029 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.