Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mtd: mtdoops: free page bitmap when the backing MTD is removed mtdoops_notify_add() allocates oops_page_used when the configured MTD device is registered. mtdoops_notify_remove() detaches from that device but leaves the bitmap allocated. If the same MTD device is later registered again, the add path allocates a new bitmap and overwrites the old pointer, leaking one vmalloc allocation per remove/add cycle. This is only visible when the backing MTD device can disappear and be registered again while mtdoops remains loaded, so the usual static MTD case does not expose it. Free the bitmap after unregistering the dumper and flushing the pending workers, then clear the pointer and page count before a later attach can allocate fresh state. Clearing the pointer also keeps the module exit path from freeing the same bitmap a second time after a remove event.
References
- https://git.kernel.org/stable/c/1e5cd8bc902331ff801df88cbb299029ae062753
- https://git.kernel.org/stable/c/477d61d54e097e90f748aa18d013805abd56bcbd
- https://git.kernel.org/stable/c/698944132083d143ef965c0090ee14ba1d9e1a5f
- https://git.kernel.org/stable/c/8414f0e9f707226de20b48c7048179fd86d352fc
- https://git.kernel.org/stable/c/956e7da12c114f13c63d126ab1d79c3b6a819060
- https://git.kernel.org/stable/c/a91ac71e67c3e01ed9afd9841435bebb930293f8
- https://git.kernel.org/stable/c/d06f91a52af11630c9f7e487f6daf242ac310cb8
- https://git.kernel.org/stable/c/f25c804947e0a28c15e73da8e2e0db959cbed716
FAQ
What is CVE-2026-89953?
CVE-2026-89953 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: mtd: mtdoops: free page bitmap when the backing MTD is removed mtdoops_notify_add() allocates oops_page_used when the configured M...
How severe is CVE-2026-89953?
CVSS scoring is not yet available for CVE-2026-89953. Check NVD for updates.
Is there a patch for CVE-2026-89953?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.