CVE-2026-43238: Linux kernel · net/sched: act_skbedit: fix divide-by-zero in tcf_skbedit_hash()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in be054cc66f739a9ba615dba9012a07fab8e7dd6f : update Linux kernel when convenient.
Data as of 6 Nov 2026, 15:50 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 be054cc66f739a9ba615dba9012a07fab8e7dd6f, 59809fda4da7730cfe84a948033f47eb45db073d, 015cebdfcb97b5347fb7f598ea712a281cb35840 +3
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. Users should update to a kernel version containing the fix commits (e.g., those identified by the fixedVersions hashes) to prevent the divide-by-zero crash. No additional mitigation steps are indicated.
Description
A divide-by-zero vulnerability was identified and fixed in the Linux kernel's net/sched act_skbedit module. The issue occurred due to an incorrect calculation of a range size that could wrap to zero, causing a divide-by-zero error in the tcf_skbedit_hash() function. This was addressed by computing the range size in a wider type and rejecting ranges larger than the maximum allowed value to prevent the crash.
References
- git.kernel.org/stable/c/59809fda4da7730cfe84a948033f47eb45db073d (opens in a new tab)
- git.kernel.org/stable/c/9c735a7d98c982a786b0db71eb6566ee00aaa04f (opens in a new tab)
- git.kernel.org/stable/c/015cebdfcb97b5347fb7f598ea712a281cb35840 (opens in a new tab)
- git.kernel.org/stable/c/4ece5eb4836f8ff03b9004dc2430a7169f282851 (opens in a new tab)
- git.kernel.org/stable/c/3c2b95b26860bd6f8e2310d31ea1200d3f8f173e (opens in a new tab)
- git.kernel.org/stable/c/be054cc66f739a9ba615dba9012a07fab8e7dd6f (opens in a new tab)