In the Linux kernel, the following vulnerability has been resolved: drbd: fix null-pointer dereference on local read error In drbd_request_endio(),… (CVE-2026-23285)
In the Linux kernel, the following vulnerability has been resolved: drbd: fix null-pointer dereference on local read error In drbd_request_endio(), READ_COMPLETED_WITH_ERROR is passed to __req_mod() with a NULL peer_device: __req_mod(req, what, NULL, &m); The READ_COMPLETED_WITH_ERROR handler then unconditionally passes this NULL peer_device to drbd_set_out_of_sync(), which dereferences it, causing a null-pointer dereference. Fix this by obtaining the peer_device via first_peer_device(device), matching how drbd_req_destroy() handles the same situation.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-23285) in the Linux kernel's DRBD subsystem involves a null-pointer dereference triggered by a local read error in drbd_request_endio(). Specifically, the READ_COMPLETED_WITH_ERROR status is passed to __req_mod() with a NULL peer_device pointer, which is then unconditionally dereferenced by drbd_set_out_of_sync(), causing a kernel crash. The fix involves correctly obtaining the peer_device via first_peer_device(device), aligning with existing handling in drbd_req_destroy(). This flaw affects multiple Ubuntu kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The vulnerability has a CVSS 3.1 score of 5.5 with an attack vector of local, requiring low privileges, no user interaction, and impacts availability by causing a denial of service. The vendor has released patches as part of Ubuntu security notices USN-8567-1 and USN-8574-1, and users are advised to update and reboot their systems. No known active exploitation has been reported.
Potential Impact
Successful exploitation of this vulnerability results in a null-pointer dereference in the Linux kernel DRBD subsystem, causing a denial of service (kernel crash). There is no impact on confidentiality or integrity according to the CVSS vector. The attack requires local access with low privileges and does not require user interaction.
Mitigation Recommendations
A patch is available and has been released by the vendor as part of standard Linux kernel updates for affected Ubuntu versions. Users should apply the updates promptly and reboot their systems to ensure the fix is applied. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules are required. Follow the vendor's update instructions carefully. There are no indications that additional mitigation steps are necessary beyond applying the official fix.
In the Linux kernel, the following vulnerability has been resolved: drbd: fix null-pointer dereference on local read error In drbd_request_endio(),… (CVE-2026-23285)
Description
In the Linux kernel, the following vulnerability has been resolved: drbd: fix null-pointer dereference on local read error In drbd_request_endio(), READ_COMPLETED_WITH_ERROR is passed to __req_mod() with a NULL peer_device: __req_mod(req, what, NULL, &m); The READ_COMPLETED_WITH_ERROR handler then unconditionally passes this NULL peer_device to drbd_set_out_of_sync(), which dereferences it, causing a null-pointer dereference. Fix this by obtaining the peer_device via first_peer_device(device), matching how drbd_req_destroy() handles the same situation.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-23285) in the Linux kernel's DRBD subsystem involves a null-pointer dereference triggered by a local read error in drbd_request_endio(). Specifically, the READ_COMPLETED_WITH_ERROR status is passed to __req_mod() with a NULL peer_device pointer, which is then unconditionally dereferenced by drbd_set_out_of_sync(), causing a kernel crash. The fix involves correctly obtaining the peer_device via first_peer_device(device), aligning with existing handling in drbd_req_destroy(). This flaw affects multiple Ubuntu kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. The vulnerability has a CVSS 3.1 score of 5.5 with an attack vector of local, requiring low privileges, no user interaction, and impacts availability by causing a denial of service. The vendor has released patches as part of Ubuntu security notices USN-8567-1 and USN-8574-1, and users are advised to update and reboot their systems. No known active exploitation has been reported.
Potential Impact
Successful exploitation of this vulnerability results in a null-pointer dereference in the Linux kernel DRBD subsystem, causing a denial of service (kernel crash). There is no impact on confidentiality or integrity according to the CVSS vector. The attack requires local access with low privileges and does not require user interaction.
Mitigation Recommendations
A patch is available and has been released by the vendor as part of standard Linux kernel updates for affected Ubuntu versions. Users should apply the updates promptly and reboot their systems to ensure the fix is applied. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules are required. Follow the vendor's update instructions carefully. There are no indications that additional mitigation steps are necessary beyond applying the official fix.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23285
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS: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"]
- Cvss Version
- 3.1
Threat ID: 6a5b62d12d1edb114c8a0157
Added to database: 07/18/2026, 11:26:09 UTC
Last enriched: 08/01/2026, 06:47:47 UTC
Last updated: 09/11/2026, 07:31:52 UTC
Views: 22
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