Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: bpf: Do not allow deleting local storage in NMI Currently, local storage may… (CVE-2026-53106)
A vulnerability in the Linux kernel's BPF subsystem related to deleting local storage in non-maskable interrupt (NMI) context has been resolved. The issue could cause deadlocks when freeing local storage or elements via certain deferred freeing mechanisms in NMI or reentrant contexts. The mitigation involves returning an error when attempting to delete local storage in NMI via BPF helpers. A full fix requires more extensive changes, but the current patch partially mitigates the issue. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied via standard system updates.
AI Analysis
Technical Summary
CVE-2026-53106 addresses a deadlock vulnerability in the Linux kernel's BPF subsystem caused by deleting local storage during non-maskable interrupts (NMI). The problem arises when local storage elements are freed using deferred mechanisms such as kfree_rcu(), call_rcu(), or call_rcu_tasks_trace() in NMI or reentrant contexts, potentially causing deadlocks. Since deleting local storage in NMI is rare, the current mitigation returns an error when deletion is attempted from BPF storage delete helpers in NMI. The full resolution would require implementing _nolock versions of call_rcu or deferring frees via irq_work, but these are not currently implemented due to complexity and resource concerns. The patch is included in Linux kernel versions 7.0.0-28.28 and later, and related Ubuntu kernel packages have been updated accordingly.
Potential Impact
The vulnerability can cause deadlocks in the Linux kernel when BPF local storage is deleted in NMI or reentrant contexts, potentially leading to system hangs or crashes (availability impact). There is no confidentiality or integrity impact reported. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in Linux kernel versions 7.0.0-28.28 and later, as well as corresponding Ubuntu kernel packages. Users should update their systems to these fixed versions and reboot to apply the changes. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled after the update. No additional mitigation actions are required beyond applying the official fixes.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: bpf: Do not allow deleting local storage in NMI Currently, local storage may… (CVE-2026-53106)
Description
A vulnerability in the Linux kernel's BPF subsystem related to deleting local storage in non-maskable interrupt (NMI) context has been resolved. The issue could cause deadlocks when freeing local storage or elements via certain deferred freeing mechanisms in NMI or reentrant contexts. The mitigation involves returning an error when attempting to delete local storage in NMI via BPF helpers. A full fix requires more extensive changes, but the current patch partially mitigates the issue. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied via standard system updates.
CVSS v3.1
Score 5.5medium
Affected software
pkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.2?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]+cvm1.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.3?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]~20.04.1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email 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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53106 addresses a deadlock vulnerability in the Linux kernel's BPF subsystem caused by deleting local storage during non-maskable interrupts (NMI). The problem arises when local storage elements are freed using deferred mechanisms such as kfree_rcu(), call_rcu(), or call_rcu_tasks_trace() in NMI or reentrant contexts, potentially causing deadlocks. Since deleting local storage in NMI is rare, the current mitigation returns an error when deletion is attempted from BPF storage delete helpers in NMI. The full resolution would require implementing _nolock versions of call_rcu or deferring frees via irq_work, but these are not currently implemented due to complexity and resource concerns. The patch is included in Linux kernel versions 7.0.0-28.28 and later, and related Ubuntu kernel packages have been updated accordingly.
Potential Impact
The vulnerability can cause deadlocks in the Linux kernel when BPF local storage is deleted in NMI or reentrant contexts, potentially leading to system hangs or crashes (availability impact). There is no confidentiality or integrity impact reported. The CVSS score is 5.5 (medium severity) with an attack vector of local, requiring low privileges and no user interaction. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and included in Linux kernel versions 7.0.0-28.28 and later, as well as corresponding Ubuntu kernel packages. Users should update their systems to these fixed versions and reboot to apply the changes. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled after the update. No additional mitigation actions are required beyond applying the official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53106
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
Threat ID: 6a5a012b91ae9bcd3f801537
Added to database: 07/17/2026, 10:17:15 UTC
Last enriched: 09/07/2026, 22:45:22 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 20
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