CVE-2026-98644: Linux kernel · bpf: Avoid soft lockup in __htab_map_lookup_and_delete_batch()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f0c09de08ec077098b7e1563f2285f1c136cd816 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in f0c09de08ec077098b7e1563f2285f1c136cd816, ca5bd55fc508fbb5c08c62206d02237a5b6fc7e8, 85136bf22404474a815fc0ed26ec0d1cbc1bc3f9 +4
Exploitation evidence
Disclosed: evidence found.
CVE published 18 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
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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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Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this issue has been implemented and is available in the Linux kernel. Users should update to a kernel version that includes the fix (commits f0c09de08ec077098b7e1563f2285f1c136cd816 and related). No additional mitigation is required once the kernel is updated.
Description
A vulnerability in the Linux kernel's BPF subsystem could cause a soft lockup due to lack of rescheduling points in the __htab_map_lookup_and_delete_batch() function. This issue affects batch operations on large hash maps, potentially causing CPUs to be held for extended periods, triggering the kernel's soft lockup watchdog. The problem has been fixed by adding rescheduling points to avoid long CPU holds during batch lookups and deletions.
References
- git.kernel.org/stable/c/5c8b1869cb99a32a962388848cd19604fb41263e (opens in a new tab)
- git.kernel.org/stable/c/ca5bd55fc508fbb5c08c62206d02237a5b6fc7e8 (opens in a new tab)
- git.kernel.org/stable/c/77a3b52b4455e6377e549539e757bc55eedefb51 (opens in a new tab)
- git.kernel.org/stable/c/f0c09de08ec077098b7e1563f2285f1c136cd816 (opens in a new tab)
- git.kernel.org/stable/c/44f9bcb5ab2b268bc763ed3ebec83308b4972936 (opens in a new tab)
- git.kernel.org/stable/c/4e48fe9b1c77966bede0a73feb3059d7595f642d (opens in a new tab)
- git.kernel.org/stable/c/85136bf22404474a815fc0ed26ec0d1cbc1bc3f9 (opens in a new tab)