CVE-2026-89953

CVE CVE-2026-89953EUVD EUVD-2026-80553Published 2026-09-16T10:32:37.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; patch: 6.6.157; patch: 6.18.51; patch: 7.2.5; be95745f01677245a061a8f51473ef5ec8ad008e <698944132083d143ef965c0090ee14ba1d9e1a5f; be95745f01677245a061a8f51473ef5ec8ad008e <f25c804947e0a28c15e73da8e2e0db959cbed716; patch: 6.12.110; be95745f01677245a061a8f51473ef5ec8ad008e <d06f91a52af11630c9f7e487f6daf242ac310cb8; be95745f01677245a061a8f51473ef5ec8ad008e <477d61d54e097e90f748aa18d013805abd56bcbd; be95745f01677245a061a8f51473ef5ec8ad008e <8414f0e9f707226de20b48c7048179fd86d352fc; patch: 5.10.270; patch: 6.1.188; be95745f01677245a061a8f51473ef5ec8ad008e <a91ac71e67c3e01ed9afd9841435bebb930293f8; patch: 5.15.221; be95745f01677245a061a8f51473ef5ec8ad008e <956e7da12c114f13c63d126ab1d79c3b6a819060; 2.6.33; be95745f01677245a061a8f51473ef5ec8ad008e <1e5cd8bc902331ff801df88cbb299029ae062753; patch: 7.3-rc1

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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