In the Linux kernel, the following vulnerability has been resolved: zram: set default primary compressor in zram_destroy_comps() Patch series "zram:… (CVE-2026-89717)
A vulnerability in the Linux kernel's zram module was fixed by setting a default primary compressor in the zram_destroy_comps() function. The issue involved resetting all compressors to NULL, including the primary one, which led to an invalid device state and potential NULL pointer dereference when the compressor was accessed. The patch addresses low-risk bugs reported by a researcher named Sashiko, including a possible BUG_ON() in zlib code and a NULL pointer dereference in zcomp.
AI Analysis
Technical Summary
The Linux kernel's zram module had a vulnerability where zram_destroy_comps() reset all compressors, including the primary compressor, to NULL. This caused an invalid device state because subsequent code could call strcmp() on a NULL compressor pointer, leading to potential crashes or undefined behavior. The patch sets a default primary compressor in zram_destroy_comps() to prevent this. The issues were reported by a security researcher and are considered low risk.
Potential Impact
The vulnerability could cause invalid device states and potential NULL pointer dereferences in the zram module, which might lead to kernel crashes or instability. However, the risk is assessed as low by the reporter and the patch author.
Mitigation Recommendations
A patch has been applied to the Linux kernel to set a default primary compressor in zram_destroy_comps(), resolving the issue. Users should update to the fixed kernel version once available. No additional mitigation is required beyond applying the official patch.
In the Linux kernel, the following vulnerability has been resolved: zram: set default primary compressor in zram_destroy_comps() Patch series "zram:… (CVE-2026-89717)
Description
A vulnerability in the Linux kernel's zram module was fixed by setting a default primary compressor in the zram_destroy_comps() function. The issue involved resetting all compressors to NULL, including the primary one, which led to an invalid device state and potential NULL pointer dereference when the compressor was accessed. The patch addresses low-risk bugs reported by a researcher named Sashiko, including a possible BUG_ON() in zlib code and a NULL pointer dereference in zcomp.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's zram module had a vulnerability where zram_destroy_comps() reset all compressors, including the primary compressor, to NULL. This caused an invalid device state because subsequent code could call strcmp() on a NULL compressor pointer, leading to potential crashes or undefined behavior. The patch sets a default primary compressor in zram_destroy_comps() to prevent this. The issues were reported by a security researcher and are considered low risk.
Potential Impact
The vulnerability could cause invalid device states and potential NULL pointer dereferences in the zram module, which might lead to kernel crashes or instability. However, the risk is assessed as low by the reporter and the patch author.
Mitigation Recommendations
A patch has been applied to the Linux kernel to set a default primary compressor in zram_destroy_comps(), resolving the issue. Users should update to the fixed kernel version once available. No additional mitigation is required beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-5wpf-6ffc-hwm4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89717"]
Threat ID: 6aa49fff55bf5e2cf5a865fe
Added to database: 09/12/2026, 00:42:39 UTC
Last enriched: 09/12/2026, 00:54:00 UTC
Last updated: 09/12/2026, 01:30:30 UTC
Views: 3
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