In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix integer overflow in UNMAP bounds check… (CVE-2026-53021)
In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix integer overflow in UNMAP bounds check sbc_execute_unmap() checks LBA + range does not exceed the device capacity, but does not guard against LBA + range wrapping around on 64-bit overflow. Add an overflow check matching the pattern already used for WRITE_SAME in the same file.
AI Analysis
Technical Summary
The Linux kernel contained a vulnerability in the SCSI target core component where the sbc_execute_unmap() function performed a bounds check on the logical block address (LBA) plus range without preventing 64-bit integer overflow. This flaw could cause the sum to wrap around, effectively bypassing the device capacity check. The vulnerability was fixed by introducing an overflow check consistent with the pattern used for WRITE_SAME operations in the same source file.
Potential Impact
This vulnerability could lead to an integer overflow during UNMAP operations in the SCSI target core, potentially causing denial of service (kernel crash or instability) due to improper bounds checking. The CVSS vector indicates no confidentiality or integrity impact but a high impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update their Linux kernel to versions equal to or newer than these to remediate the vulnerability. Since this is not a cloud service, manual patching is required. Patch status is confirmed by the provided affectedVersions indicating fixed versions at or above 5.15.0-1112.119~20.04.1.
In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix integer overflow in UNMAP bounds check… (CVE-2026-53021)
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Fix integer overflow in UNMAP bounds check sbc_execute_unmap() checks LBA + range does not exceed the device capacity, but does not guard against LBA + range wrapping around on 64-bit overflow. Add an overflow check matching the pattern already used for WRITE_SAME in the same file.
CVSS v3.1
Score 5.5medium
Affected software
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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
The Linux kernel contained a vulnerability in the SCSI target core component where the sbc_execute_unmap() function performed a bounds check on the logical block address (LBA) plus range without preventing 64-bit integer overflow. This flaw could cause the sum to wrap around, effectively bypassing the device capacity check. The vulnerability was fixed by introducing an overflow check consistent with the pattern used for WRITE_SAME operations in the same source file.
Potential Impact
This vulnerability could lead to an integer overflow during UNMAP operations in the SCSI target core, potentially causing denial of service (kernel crash or instability) due to improper bounds checking. The CVSS vector indicates no confidentiality or integrity impact but a high impact on availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available in Linux kernel versions 5.15.0-1112.119~20.04.1 and later. Users should update their Linux kernel to versions equal to or newer than these to remediate the vulnerability. Since this is not a cloud service, manual patching is required. Patch status is confirmed by the provided affectedVersions indicating fixed versions at or above 5.15.0-1112.119~20.04.1.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53021
- Osv Schema Version
- 1.7.0
- Aliases
- []
- 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","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a015291ae9bcd3f80253a
Added to database: 07/17/2026, 10:17:54 UTC
Last enriched: 07/30/2026, 20:53:25 UTC
Last updated: 07/31/2026, 21:28:57 UTC
Views: 1
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