NVD / CVE Program· CNA Linux

CVE-2026-43197: netconsole: avoid OOB reads, msg is not nul-terminated

CriticalCVSS 9.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 36/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.58% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: Linux Linux 3126a2f98beaec5a554a1fb31c46db1e8542665e, 68fe91df6ea822dae772fceaad0686e4f5839aec, 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3126a2f98beaec5a554a1fb31c46db1e8542665e, 68fe91df6ea822dae772fceaad0686e4f5839aec, 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: netconsole: avoid OOB reads, msg is not nul-terminated msg passed to netconsole from the console subsystem is not guaranteed to be nul-terminated. Before recent commit 7eab73b18630 ("netconsole: convert to NBCON console infrastructure") the message would be placed in printk_shared_pbufs, a static global buffer, so KASAN had harder time catching OOB accesses. Now we see: printk: console [netcon_ext0] enabled BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240 Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594 CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9 Call Trace: kasan_report+0xe4/0x120 string+0x1f7/0x240 vsnprintf+0x655/0xba0 scnprintf+0xba/0x120 netconsole_write+0x3fe/0xa10 nbcon_emit_next_record+0x46e/0x860 nbcon_kthread_func+0x623/0x750 Allocated by task 1: nbcon_alloc+0x1ea/0x450 register_console+0x26b/0xe10 init_netconsole+0xbb0/0xda0 The buggy address belongs to the object at ffff88813b6d4000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)

BDU:2026-12087

Published: May 6, 2026
Updated: Nov 11, 2026
EPSS: 0.5% · 48th percentile
CWE: CWE-125

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 36 / 40 · 9.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 9.1; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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

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
- 6.6affected
- c62c0a17f9b7398022f9eebe547878033264f81f and later · before 68fe91df6ea822dae772fceaad0686e4f5839aecaffected · git
- c62c0a17f9b7398022f9eebe547878033264f81f and later · before 8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9affected · git
- c62c0a17f9b7398022f9eebe547878033264f81f and later · before 3126a2f98beaec5a554a1fb31c46db1e8542665eaffected · git
- c62c0a17f9b7398022f9eebe547878033264f81f and later · before 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58affected · git
- c62c0a17f9b7398022f9eebe547878033264f81f and later · before 82aec772fca2223bc5774bd9af486fd95766e578affected · git
- before 6.6not affected · semver
- 6.6.160 and later · up to and including 6.6.*not affected · semver
- 6.12.103 and later · up to and including 6.12.*not affected · semver
- 6.18.16 and later · up to and including 6.18.*not affected · semver

Affected versions

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

linux linux kernel6.6 and later · before 6.18.16
linux linux kernel6.19 and later · before 6.19.6
linux linux kernel7.0

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux-6.12	before 6.12.107-1~deb12u1	6.12.107-1~deb12u1
Debian:13	linux	before 6.12.105-1	6.12.105-1
Debian:14	linux	before 6.19.6-1	6.19.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-43195May 6, 2026 · drm/amdgpu: validate user queue size constraints
22Monitor
← EarlierCVE-2026-43196May 6, 2026 · soc: ti: pruss: Fix double free in pruss_clk_mux_setup()
31Monitor
Later →CVE-2026-43198May 6, 2026 · tcp: fix potential race in tcp_v6_syn_recv_sock()
39Monitor

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	3126a2f98beaec5a554a1fb31c46db1e8542665e	Vendor (CNA)
Linux Linux	68fe91df6ea822dae772fceaad0686e4f5839aec	Vendor (CNA)
Linux Linux	74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58	Vendor (CNA)
Linux Linux	82aec772fca2223bc5774bd9af486fd95766e578	Vendor (CNA)
Linux Linux	8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9	Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0	Release Notes	Microsoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0	Release Notes	Microsoft (MSRC)
debian:linux	6.12.105-1 · Debian:13	Package registry (OSV)
debian:linux-6.12	6.12.107-1~deb12u1 · Debian:12	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.