CVE-2026-68434: Linux kernel · serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f85a42fb90399dedcf81c146d09c07e4548b1e8c : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:19 UTC
Rated by Threat Radar · 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 f85a42fb90399dedcf81c146d09c07e4548b1e8c, bdaa8871b53fe9b1730ef64dda2fcd662fd83339, b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 +12
Exploitation evidence
Disclosed: evidence found.
CVE published 12 Aug 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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Description
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected platforms") replaced the dnv_board setup and exit callbacks with PTR_IF(false, ...), which evaluates to NULL. However, the three call sites in mid8250_probe() and mid8250_remove() unconditionally dereference these function pointers without NULL checks, causing a NULL pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon D (ICX-D/CDF), or Snowridge (SNR) platform. Fix this by adding the missing NULL checks before calling the setup and exit callbacks.
References
- git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339 (opens in a new tab)
- git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c (opens in a new tab)
- git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1 (opens in a new tab)
- git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10 (opens in a new tab)
- git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e (opens in a new tab)
- git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 (opens in a new tab)
- git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be (opens in a new tab)
- git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d (opens in a new tab)