In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: cancel card-detect work on remove Disabling the device interrupt… (CVE-2026-89441)
A use-after-free vulnerability in the Linux kernel's via-sdmmc driver was resolved by properly canceling pending card-detect work after freeing the IRQ during device removal. The flaw allowed queued work to access freed memory, potentially causing instability or crashes.
AI Analysis
Technical Summary
The Linux kernel via-sdmmc driver had a vulnerability where after disabling the device interrupt and freeing the IRQ during device removal, already queued card-detect work could still execute. This work function dereferenced the host's MMIO base, which could have been freed after the remove function returned, leading to use-after-free memory access. The fix involves canceling the card-detect work after freeing the IRQ and before canceling other related work, ensuring no work runs on freed memory. This issue was identified through static analysis and manual code review.
Potential Impact
The vulnerability could lead to use-after-free memory access in kernel space, potentially causing system instability, crashes, or other undefined behavior. There is no information on active exploitation in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel source code to cancel pending card-detect work properly during device removal. Users should update to a kernel version that includes this fix. No additional mitigation is indicated.
In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: cancel card-detect work on remove Disabling the device interrupt… (CVE-2026-89441)
Description
A use-after-free vulnerability in the Linux kernel's via-sdmmc driver was resolved by properly canceling pending card-detect work after freeing the IRQ during device removal. The flaw allowed queued work to access freed memory, potentially causing instability or crashes.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel via-sdmmc driver had a vulnerability where after disabling the device interrupt and freeing the IRQ during device removal, already queued card-detect work could still execute. This work function dereferenced the host's MMIO base, which could have been freed after the remove function returned, leading to use-after-free memory access. The fix involves canceling the card-detect work after freeing the IRQ and before canceling other related work, ensuring no work runs on freed memory. This issue was identified through static analysis and manual code review.
Potential Impact
The vulnerability could lead to use-after-free memory access in kernel space, potentially causing system instability, crashes, or other undefined behavior. There is no information on active exploitation in the wild.
Mitigation Recommendations
A fix has been implemented in the Linux kernel source code to cancel pending card-detect work properly during device removal. Users should update to a kernel version that includes this fix. No additional mitigation is indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6v98-4pph-jq73
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89441"]
Threat ID: 6aa4a02655bf5e2cf5a869cd
Added to database: 09/12/2026, 00:43:18 UTC
Last enriched: 09/12/2026, 01:19:03 UTC
Last updated: 09/12/2026, 01:19:03 UTC
Views: 2
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