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VulnerabilityPublished Updated

CVE-2026-43123: Linux kernel · fbcon: check return value of con2fb_acquire_newinfo()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f57b61624c86ef8f87f6e6b7dd0755de03d90e89 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:04 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in f57b61624c86ef8f87f6e6b7dd0755de03d90e89, d3e535533767c85788529e626478718b7e95a59f, a785c4e2a999c2d51dfcf40d317cfb30cc735d2c +4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < f57b61624c86ef8f87f6e6b7dd0755de03d90e89
Fixed in
  • f57b61624c86ef8f87f6e6b7dd0755de03d90e89
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < d3e535533767c85788529e626478718b7e95a59f
Fixed in
  • d3e535533767c85788529e626478718b7e95a59f
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < a785c4e2a999c2d51dfcf40d317cfb30cc735d2c
Fixed in
  • a785c4e2a999c2d51dfcf40d317cfb30cc735d2c
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < 011a0502801c8536f64141a2b61362c14f456544
Fixed in
  • 011a0502801c8536f64141a2b61362c14f456544
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < 11a93180a70bb3095a9bd80d113d9277e30d9959
Fixed in
  • 11a93180a70bb3095a9bd80d113d9277e30d9959
LinuxLinuxAffected
  • ≥ d1baa4ffa677bf6986c460fcfd4cdaf8bfe66f0e, < 3b5a754ec86bc6064af9aca76eb191c2405e6b0c
Fixed in
  • 3b5a754ec86bc6064af9aca76eb191c2405e6b0c

AI-suggested

A fix is available and has been applied in the Linux kernel source code as indicated by multiple fixed commits. Users should update to a kernel version that includes these fixes to remediate the vulnerability.

Description

A vulnerability in the Linux kernel fbcon subsystem was fixed by adding a check for the return value of con2fb_acquire_newinfo(). Without this check, if fbcon_open() fails, a NULL pointer dereference occurs, potentially causing kernel instability.

References

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