HOMEVULNERABILITIESCVE-2026-43199
HIGH

CVE-2026-43199

Published: May 6, 2026· Updated: May 11, 2026

7.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:4.7th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Fix "scheduling while atomic" in IPsec MAC address query

Fix a "scheduling while atomic" bug in mlx5e_ipsec_init_macs() by

replacing mlx5_query_mac_address() with ether_addr_copy() to get the

local MAC address directly from netdev->dev_addr.

The issue occurs because mlx5_query_mac_address() queries the hardware

which involves mlx5_cmd_exec() that can sleep, but it is called from

the mlx5e_ipsec_handle_event workqueue which runs in atomic context.

The MAC address is already available in netdev->dev_addr, so no need

to query hardware. This avoids the sleeping call and resolves the bug.

Call trace:

BUG: scheduling while atomic: kworker/u112:2/69344/0x00000200

__schedule+0x7ab/0xa20

schedule+0x1c/0xb0

schedule_timeout+0x6e/0xf0

__wait_for_common+0x91/0x1b0

cmd_exec+0xa85/0xff0 [mlx5_core]

mlx5_cmd_exec+0x1f/0x50 [mlx5_core]

mlx5_query_nic_vport_mac_address+0x7b/0xd0 [mlx5_core]

mlx5_query_mac_address+0x19/0x30 [mlx5_core]

mlx5e_ipsec_init_macs+0xc1/0x720 [mlx5_core]

mlx5e_ipsec_build_accel_xfrm_attrs+0x422/0x670 [mlx5_core]

mlx5e_ipsec_handle_event+0x2b9/0x460 [mlx5_core]

process_one_work+0x178/0x2e0

worker_thread+0x2ea/0x430

NVD Source

Technical Analysis

CVE-2026-43199 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/stable/c/546de94e41e92e1f7dc6213615fb7c794d05db98
PATCHhttps://git.kernel.org/stable/c/57957bc7f1865778ec9b1618e15515feb6df7eb4
PATCHhttps://git.kernel.org/stable/c/859380694f434597407632c29f30fdb5e763e6cc
PATCHhttps://git.kernel.org/stable/c/e1407fb7c337373dfaaae2445d828b0b9ae26a29

All References (4)

→
https://git.kernel.org/stable/c/546de94e41e92e1f7dc6213615fb7c794d05db98Patch
→
https://git.kernel.org/stable/c/57957bc7f1865778ec9b1618e15515feb6df7eb4Patch
→
https://git.kernel.org/stable/c/859380694f434597407632c29f30fdb5e763e6ccPatch
→
https://git.kernel.org/stable/c/e1407fb7c337373dfaaae2445d828b0b9ae26a29Patch

Quick Facts

CVE IDCVE-2026-43199
CVSS Score7.5 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43199 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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