CVE-2026-43123: Linux kernel · fbcon: check return value of con2fb_acquire_newinfo()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f57b61624c86ef8f87f6e6b7dd0755de03d90e89 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:04 UTC
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
Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/d3e535533767c85788529e626478718b7e95a59f (opens in a new tab)
- git.kernel.org/stable/c/3b5a754ec86bc6064af9aca76eb191c2405e6b0c (opens in a new tab)
- git.kernel.org/stable/c/a785c4e2a999c2d51dfcf40d317cfb30cc735d2c (opens in a new tab)
- git.kernel.org/stable/c/0b038c0be6827dd2dbb1ce4f8d92d97c80cbe9cc (opens in a new tab)
- git.kernel.org/stable/c/11a93180a70bb3095a9bd80d113d9277e30d9959 (opens in a new tab)
- git.kernel.org/stable/c/f57b61624c86ef8f87f6e6b7dd0755de03d90e89 (opens in a new tab)
- git.kernel.org/stable/c/011a0502801c8536f64141a2b61362c14f456544 (opens in a new tab)