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VulnerabilityPublished

CVE-2026-98644: Linux kernel · bpf: Avoid soft lockup in __htab_map_lookup_and_delete_batch()

Affects Linux kernelSource CVE Database V5

0

Not known to be exploited · fixed in f0c09de08ec077098b7e1563f2285f1c136cd816 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity
Medium

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

  1. Disclosed: evidence found.

    CVE published 18 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < f0c09de08ec077098b7e1563f2285f1c136cd816
Fixed in
  • f0c09de08ec077098b7e1563f2285f1c136cd816
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < ca5bd55fc508fbb5c08c62206d02237a5b6fc7e8
Fixed in
  • ca5bd55fc508fbb5c08c62206d02237a5b6fc7e8
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < 85136bf22404474a815fc0ed26ec0d1cbc1bc3f9
Fixed in
  • 85136bf22404474a815fc0ed26ec0d1cbc1bc3f9
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < 77a3b52b4455e6377e549539e757bc55eedefb51
Fixed in
  • 77a3b52b4455e6377e549539e757bc55eedefb51
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < 44f9bcb5ab2b268bc763ed3ebec83308b4972936
Fixed in
  • 44f9bcb5ab2b268bc763ed3ebec83308b4972936
LinuxLinuxAffected
  • ≥ 057996380a42bb64ccc04383cfa9c0ace4ea11f0, < 5c8b1869cb99a32a962388848cd19604fb41263e
Fixed in
  • 5c8b1869cb99a32a962388848cd19604fb41263e

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

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