{"metadata": {"vulnerability": "CVE-2026-98939", "count": 23, "kinds": {"milestone": 7, "sighting": 1, "kev": 0, "other": 15}}, "data": [{"timestamp": "2026-09-25T10:25:14.381Z", "date_only": false, "value": "2026-09-25T10:25:14.381Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-98939", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-23T12:12:06.180Z", "date_only": false, "value": "2026-10-23T12:12:06.180Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-98939", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-23T12:12:06.180Z", "date_only": false, "value": "2026-10-23T12:12:06.180Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-98939", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-10-23T12:12:06.180Z", "date_only": false, "value": "2026-10-23T12:12:06.180Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / Linux", "record": "CVE-2026-98939", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-10-23T12:55:05.168Z", "date_only": false, "value": "2026-10-23T12:55:05.168195Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117490326219428144", "record": "CVE-2026-98939", "field": "creation_timestamp", "uuid": "2724eb25-9d00-4021-b4de-36424bb3b848", "content": "CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing In the Linux kernel, the following vulnerability has been resolved:\nx86/mm: Drop unnecessary PMD page copy when freeing\nOn a box with a discrete GPU, lockdep reports a possible deadlock assoon as kswapd shrinks the TTM page pool. The immediate cause is anx86 commit that added an mmap_read_lock() to kernel page protectionmunging code.\nThe huge vmap code holds the same lock over a GFP_KERNEL allocation,which is a no-no now that reclaim can take it. That allocation is in apage table *free* path and ends up being for dubious purposes[1].Basically, it tries to avoid hardware setting Accessed=1 in page tableentries that are unreachable by the hardware, a non-issue.\nRemove the PMD copy. Detach the original PMD page at the PUD, flushthe mid-level caches, and free the PTE tables straight from thedetached PMD page. With no allocation left, the locking issue is gone.\nLockdep splat/analysis:\n  WARNING: possible circular locking dependency detected  7.3.0-rc3-f6e7b42bf05b+ #183 Tainted: G     U  ------------------------------------------------------  kswapd0/269 is trying to acquire lock:  ((init_mm).mmap_lock){++++}-{4:4}, at: change_page_attr_set_clr+0x29a/0x4a0  but task is already holding lock:  (pool_shrink_rwsem){.+.+}-{4:4}, at: ttm_pool_shrink+0xb2/0x330 [ttm]  Chain exists of:    (init_mm).mmap_lock --> fs_reclaim --> pool_shrink_rwsem\nThe cycle is built from three edges:\n  1) pool_shrink_rwsem -> (init_mm).mmap_lock\n     The TTM shrinker restores the caching attribute of every page it     frees, while holding pool_shrink_rwsem:\n       ttm_pool_shrink()       -> ttm_pool_dispose_list()       -> ttm_pool_free_page()       -> set_pages_wb()       -> change_page_attr_set_clr()   [ init_mm mmap read lock ]\n  2) fs_reclaim -> pool_shrink_rwsem\n     The same shrinker, called from reclaim.\n  3) (init_mm).mmap_lock -> fs_reclaim\n     ioremap() installing a huge PUD mapping over an existing PMD table:\n       ioremap_page_range()       -> vmap_range_noflush()       -> vmap_try_huge_pud()          [ init_mm mmap read lock ]       -> pud_free_pmd_page()       -> __get_free_page(GFP_KERNEL)  [ enters reclaim ]\n[ dhansen: Lots of changelog munging/trimming and merged comments from my\t   version of the fix. ]\nhttps://www.cve.org/CVERecord?id=CVE-2026-98939https://git.kernel.org/stable/c/d3c2d2692bdf4af94bb27bc7a3aa0a348a567606https://git.kernel.org/stable/c/f38c57a28ebbd057471573e39555d5aa11ab03cfhttps://git.kernel.org/stable/c/e3ee38c1bc0b11a8d3e63dce7050759b61864286#kernel #Linux#CVE_2026_98939#bot", "url": "https://infosec.exchange/users/cve/statuses/117490326219428144"}, {"timestamp": "2026-10-23T13:17:00Z", "date_only": false, "value": "2026-10-23T13:17:00Z", "kind": "milestone", "label": "Published", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2026-98939", 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