In the Linux kernel, the following vulnerability has been resolved: dm raid1: reserve space for NUL-terminator in build_constructor_string() Reserve… (CVE-2026-89575)
A buffer overflow vulnerability in the Linux kernel's device mapper (dm) raid1 component was resolved by reserving space for a NUL-terminator in the build_constructor_string() function. This prevents overflow in sprintf() when formatting a long long value with up to 20 decimal digits.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's dm raid1 module involved insufficient space reserved for the NUL-terminator in the build_constructor_string() function. Specifically, after formatting a long long value with sprintf(), the lack of reserved space for the terminating NUL character could cause a buffer overflow. The issue was fixed by ensuring space is reserved for the NUL-terminator after the maximum 20 decimal digits of the value.
Potential Impact
The vulnerability could lead to a buffer overflow in the kernel space, potentially causing memory corruption or instability. However, no known exploits in the wild have been reported. The impact is limited to the dm raid1 component of the Linux kernel.
Mitigation Recommendations
A fix has been applied to the Linux kernel to reserve space for the NUL-terminator in the affected function, resolving the buffer overflow issue. Users should update to the patched kernel version once available. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: dm raid1: reserve space for NUL-terminator in build_constructor_string() Reserve… (CVE-2026-89575)
Description
A buffer overflow vulnerability in the Linux kernel's device mapper (dm) raid1 component was resolved by reserving space for a NUL-terminator in the build_constructor_string() function. This prevents overflow in sprintf() when formatting a long long value with up to 20 decimal digits.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's dm raid1 module involved insufficient space reserved for the NUL-terminator in the build_constructor_string() function. Specifically, after formatting a long long value with sprintf(), the lack of reserved space for the terminating NUL character could cause a buffer overflow. The issue was fixed by ensuring space is reserved for the NUL-terminator after the maximum 20 decimal digits of the value.
Potential Impact
The vulnerability could lead to a buffer overflow in the kernel space, potentially causing memory corruption or instability. However, no known exploits in the wild have been reported. The impact is limited to the dm raid1 component of the Linux kernel.
Mitigation Recommendations
A fix has been applied to the Linux kernel to reserve space for the NUL-terminator in the affected function, resolving the buffer overflow issue. Users should update to the patched kernel version once available. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-hrch-mw7x-pxg7
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89575"]
Threat ID: 6aa4a00e55bf5e2cf5a8669b
Added to database: 09/12/2026, 00:42:54 UTC
Last enriched: 09/12/2026, 01:05:36 UTC
Last updated: 09/12/2026, 01:05:36 UTC
Views: 2
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