CVE-2026-43012· NVD / CVE Program· CNA Linux

net/mlx5: Fix switchdev mode rollback in case of failure

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix switchdev mode rollback in case of failure If for some internal reason switchdev mode fails, we rollback to legacy mode, before this patch, rollback will unregister the uplink netdev and leave it unregistered causing the below kernel bug. To fix this, we need to avoid netdev unregister by setting the proper rollback flag 'MLX5_PRIV_FLAGS_SWITCH_LEGACY' to indicate legacy mode. devlink (431) used greatest stack depth: 11048 bytes left mlx5_core 0000:00:03.0: E-Switch: Disable: mode(LEGACY), nvfs(0), \ necvfs(0), active vports(0) mlx5_core 0000:00:03.0: E-Switch: Supported tc chains and prios offload mlx5_core 0000:00:03.0: Loading uplink representor for vport 65535 mlx5_core 0000:00:03.0: mlx5_cmd_out_err:816:(pid 456): \ QUERY_HCA_CAP(0x100) op_mod(0x0) failed, \ status bad parameter(0x3), syndrome (0x3a3846), err(-22) mlx5_core 0000:00:03.0 enp0s3np0 (unregistered): Unloading uplink \ representor for vport 65535 ------------[ cut here ]------------ kernel BUG at net/core/dev.c:12070! Oops: invalid opcode: 0000 [#1] SMP NOPTI CPU: 2 UID: 0 PID: 456 Comm: devlink Not tainted 6.16.0-rc3+ \ #9 PREEMPT(voluntary) RIP: 0010:unregister_netdevice_many_notify+0x123/0xae0 ... Call Trace: [ 90.923094] unregister_netdevice_queue+0xad/0xf0 [ 90.923323] unregister_netdev+0x1c/0x40 [ 90.923522] mlx5e_vport_rep_unload+0x61/0xc6 [ 90.923736] esw_offloads_enable+0x8e6/0x920 [ 90.923947] mlx5_eswitch_enable_locked+0x349/0x430 [ 90.924182] ? is_mp_supported+0x57/0xb0 [ 90.924376] mlx5_devlink_eswitch_mode_set+0x167/0x350 [ 90.924628] devlink_nl_eswitch_set_doit+0x6f/0xf0 [ 90.924862] genl_family_rcv_msg_doit+0xe8/0x140 [ 90.925088] genl_rcv_msg+0x18b/0x290 [ 90.925269] ? __pfx_devlink_nl_pre_doit+0x10/0x10 [ 90.925506] ? __pfx_devlink_nl_eswitch_set_doit+0x10/0x10 [ 90.925766] ? __pfx_devlink_nl_post_doit+0x10/0x10 [ 90.926001] ? __pfx_genl_rcv_msg+0x10/0x10 [ 90.926206] netlink_rcv_skb+0x52/0x100 [ 90.926393] genl_rcv+0x28/0x40 [ 90.926557] netlink_unicast+0x27d/0x3d0 [ 90.926749] netlink_sendmsg+0x1f7/0x430 [ 90.926942] __sys_sendto+0x213/0x220 [ 90.927127] ? __sys_recvmsg+0x6a/0xd0 [ 90.927312] __x64_sys_sendto+0x24/0x30 [ 90.927504] do_syscall_64+0x50/0x1c0 [ 90.927687] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 90.927929] RIP: 0033:0x7f7d0363e047

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

Published: May 1, 2026
Updated: Jun 17, 2026
EPSS: 0.2% · 5th percentile
CWE: —

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

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Affected systems

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel6.12.9 and later · before 6.12.81
linux linux kernel6.13.1 and later · before 6.18.22
linux linux kernel6.19 and later · before 6.19.12
linux linux kernel6.13
linux linux kernel7.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 6.13affected
- de85624c623dbb5fdb3ae7b08b66894a072c0cc0 and later · before 2ebb13f3e8be0b61f72425b34cce60c8b6ad1891affected · git
- 2a4f56fbcc473d8faeb29b73082df39efbe5893c and later · before e27153b2bd6e6699b544ac4dfa35d167bed5e642affected · git
- 2a4f56fbcc473d8faeb29b73082df39efbe5893c and later · before 4363698838b7ec6e8d85b179495889aa7e522f91affected · git
- 2a4f56fbcc473d8faeb29b73082df39efbe5893c and later · before 403186400a1a6166efe7031edc549c15fee4723faffected · git
- 6.12.9 and later · before 6.12.81affected · semver
- before 6.13not affected · semver
- 6.12.81 and later · up to and including 6.12.*not affected · semver
- 6.18.22 and later · up to and including 6.18.*not affected · semver
- 6.19.12 and later · up to and including 6.19.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.12-1	6.19.12-1
SUSE:Linux Enterprise Server 16.0	kernel-azure	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0	kernel-docs	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0	kernel-kvmsmall	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0	kernel-obs-qa	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Enterprise Server 16.0	kernel-zfcpdump	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro 6.2	kernel-64kb	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro 6.2	kernel-default	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro 6.2	kernel-default-base	before 6.12.0-160000.34.1.160000.2.15	6.12.0-160000.34.1.160000.2.15
SUSE:Linux Micro 6.2	kernel-rt	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro 6.2	kernel-source	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro Extras 6.2	kernel-obs-build	before 6.12.0-160000.34.1	6.12.0-160000.34.1
SUSE:Linux Micro Extras 6.2	kernel-syms	before 6.12.0-160000.34.1	6.12.0-160000.34.1

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	2ebb13f3e8be0b61f72425b34cce60c8b6ad1891	Vendor (CNA)
Linux Linux	403186400a1a6166efe7031edc549c15fee4723f	Vendor (CNA)
Linux Linux	4363698838b7ec6e8d85b179495889aa7e522f91	Vendor (CNA)
Linux Linux	6.12.81	Vendor (CNA)
Linux Linux	e27153b2bd6e6699b544ac4dfa35d167bed5e642	Vendor (CNA)
debian:linux	6.12.85-1 · Debian:13	Package registry (OSV)
suse:kernel-64kb	6.12.0-160000.34.1 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:kernel-azure	6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)
suse:kernel-default	6.12.0-160000.34.1 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:kernel-default-base	6.12.0-160000.34.1.160000.2.15 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:kernel-docs	6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)
suse:kernel-kvmsmall	6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)
suse:kernel-obs-build	6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2	Package registry (OSV)
suse:kernel-obs-qa	6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)
suse:kernel-rt	6.12.0-160000.34.1 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:kernel-source	6.12.0-160000.34.1 · SUSE:Linux Micro 6.2	Package registry (OSV)
suse:kernel-syms	6.12.0-160000.34.1 · SUSE:Linux Micro Extras 6.2	Package registry (OSV)
suse:kernel-zfcpdump	6.12.0-160000.34.1 · SUSE:Linux Enterprise Server 16.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0143 · May 4, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

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Data sources and verification

CNA: Linux

CVE.org (CNA)May 23, 2026, 4:05 PM UTC
NVDJun 17, 2026, 6:48 AM UTC
FIRST EPSSOct 4, 2026, 12:00 AM UTC
OSV / GHSAOct 5, 2026, 3:22 AM UTC

Each line is when that source was last processed for this record.

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