Kernel memory corruption via stale bridge counter
Published Oct 4, 2025 · Updated Oct 4, 2025
Use-after-free in the Linux kernel's MSM DRM driver from 3.12 through 6.0.6 allows local users to corrupt kernel memory during teardown. msm_drm_uninit removes bridges but fails to reset num_bridges, so later teardown accesses freed bridge pointers and repeated deferrals can write beyond bridges[8]. Triggering driver rebinding requires root or CAP_SYS_ADMIN, while affected Qualcomm MSM hardware can encounter the path during ordinary probe deferral.
Summary
What happened
Use-after-free in the Linux kernel's MSM DRM driver from 3.12 through 6.0.6 allows local users to corrupt kernel memory during teardown. msm_drm_uninit removes bridges but fails to reset num_bridges, so later teardown accesses freed bridge pointers and repeated deferrals can write beyond bridges[8]. Triggering driver rebinding requires root or CAP_SYS_ADMIN, while affected Qualcomm MSM hardware can encounter the path during ordinary probe deferral.
The record
- CVE
- CVE-2022-50492
- Published
- Oct 4, 2025
- Updated
- Oct 4, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Oct 4, 2025CVE publishedPublication date reported by the CVE source.
- Oct 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=3.12
- Affected versionversion=a3376e3ec81c5dd0622cbc187db76d2824d31c1c <0a30a47741b6df1f9555a0fac6aebb7e8c363bad
- Affected versionversion=a3376e3ec81c5dd0622cbc187db76d2824d31c1c <6808abdb33bf90330e70a687d29f038507e06ebb
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What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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