CVE-2026-98234: Linux kernel · net/sched: hhf: cap hh_flows_limit at change time
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f6547d27ce2093c5627636fb63dd0b7523c466f9 : patch Linux kernel soon.
Data as of 26 Oct 2026, 14:05 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in f6547d27ce2093c5627636fb63dd0b7523c466f9, f3f4a5cb4a6e9b1f1f25d34dfc25f836a1601db4, d8e2f1f0263b7c97b222c06070cccf13e0ab7112 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
This vulnerability has been fixed in the Linux kernel by bounding the hh_flows_limit attribute and correcting the initialization sequence. Users should update to a Linux kernel version that includes the fix (commits listed in establishedFacts.fixedVersions). No additional mitigation is required beyond applying the official fix.
Description
CVE-2026-98234 is a vulnerability in the Linux kernel's net/sched subsystem affecting the heavy-hitter filter (hhf). It involves an unbounded hh_flows_limit attribute that allows excessive memory allocation under spoofed traffic conditions, potentially causing unbounded memory growth. The issue has been fixed by bounding the hh_flows_limit attribute and correcting initialization order to preserve configured values.
References
- git.kernel.org/stable/c/7adfd0a42174b85c6bd678858ecd6674f403f336 (opens in a new tab)
- git.kernel.org/stable/c/35fd423a5c5132c6f4321f6c4f0a7b4b90af830c (opens in a new tab)
- git.kernel.org/stable/c/06d2a101e89063cb0b9b459104db48bdfb0a797d (opens in a new tab)
- git.kernel.org/stable/c/d8e2f1f0263b7c97b222c06070cccf13e0ab7112 (opens in a new tab)
- git.kernel.org/stable/c/f3f4a5cb4a6e9b1f1f25d34dfc25f836a1601db4 (opens in a new tab)
- git.kernel.org/stable/c/1731ff1d20489afe4cd01b7d16d37f324746ac54 (opens in a new tab)
- git.kernel.org/stable/c/f6547d27ce2093c5627636fb63dd0b7523c466f9 (opens in a new tab)
- git.kernel.org/stable/c/2cef2588c995722a901368def30befeef9ae55c6 (opens in a new tab)