Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host… (CVE-2026-64416)
A vulnerability in the Linux kernel's memory management subsystem (swap_cgroup) was fixed to prevent a NULL pointer dereference on swapless hosts. The flaw occurs because lookup_swap_cgroup_id() does not verify that a swap type was registered before dereferencing a pointer, leading to a crash when a corrupted page table entry (PTE) is encountered. This can cause a denial of service by crashing the host during process exit. The issue affects certain versions of the linux-hwe-edge kernel and has been addressed in updated kernel packages.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-64416 involves a NULL pointer dereference in the swap_cgroup subsystem's lookup_swap_cgroup_id() function on swapless hosts. The function passes a pointer without checking if the swap type was registered, resulting in a NULL dereference and crash when a corrupted PTE is processed. This flaw can cause the host system to crash during process exit, as demonstrated in production on a swapless 6.12.58 kernel. The vulnerability has been resolved in linux-hwe-edge kernel versions 7.0.0 and later.
Potential Impact
This vulnerability can cause a denial of service by crashing the Linux host system when a corrupted swap entry is encountered in the page table. It does not impact confidentiality or integrity but results in availability loss due to system crashes. There is no indication of privilege escalation or code execution. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed linux-hwe-edge kernel versions 7.0.0-31.31 and later as specified in the Ubuntu security advisories USN-8726-1 and USN-8727-1. After updating, a system reboot is required to apply the kernel fixes. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigation is required beyond applying the official kernel updates.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: mm: swap_cgroup: fix NULL deref in lookup_swap_cgroup_id on swapless host… (CVE-2026-64416)
Description
A vulnerability in the Linux kernel's memory management subsystem (swap_cgroup) was fixed to prevent a NULL pointer dereference on swapless hosts. The flaw occurs because lookup_swap_cgroup_id() does not verify that a swap type was registered before dereferencing a pointer, leading to a crash when a corrupted page table entry (PTE) is encountered. This can cause a denial of service by crashing the host during process exit. The issue affects certain versions of the linux-hwe-edge kernel and has been addressed in updated kernel packages.
CVSS v3.1
Score 5.5medium
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-64416 involves a NULL pointer dereference in the swap_cgroup subsystem's lookup_swap_cgroup_id() function on swapless hosts. The function passes a pointer without checking if the swap type was registered, resulting in a NULL dereference and crash when a corrupted PTE is processed. This flaw can cause the host system to crash during process exit, as demonstrated in production on a swapless 6.12.58 kernel. The vulnerability has been resolved in linux-hwe-edge kernel versions 7.0.0 and later.
Potential Impact
This vulnerability can cause a denial of service by crashing the Linux host system when a corrupted swap entry is encountered in the page table. It does not impact confidentiality or integrity but results in availability loss due to system crashes. There is no indication of privilege escalation or code execution. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction.
Mitigation Recommendations
A patch is available and should be applied by updating to the fixed linux-hwe-edge kernel versions 7.0.0-31.31 and later as specified in the Ubuntu security advisories USN-8726-1 and USN-8727-1. After updating, a system reboot is required to apply the kernel fixes. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. No additional mitigation is required beyond applying the official kernel updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-fp4w-89fw-h8p4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64416"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420a9c2644c7f8084151
Added to database: 07/25/2026, 23:08:58 UTC
Last enriched: 09/07/2026, 17:59:57 UTC
Last updated: 09/07/2026, 22:52:14 UTC
Views: 92
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.