CVE-2026-74482 (GCVE-0-2026-74482)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
Title
mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios __folio_split() keeps dereferencing the mapping after the split: shmem_uncharge(mapping->host) and remap_page() while the folios are still frozen/locked, and i_mmap_unlock_read(mapping) at the very end, after the after-split folios have been unlocked and freed. Nothing holds an inode reference across that. The split relies on @folio -- which the beyond-EOF drop loop never removes, as it starts at folio_next(folio) -- staying locked and in the page cache to hold off eviction. But the unlock loop unlocks @folio before i_mmap_unlock_read() runs. If the caller's @lock_at is a tail beyond EOF, as memory_failure() passes when splitting a poisoned tail of a shmem THP that reaches past i_size during truncation, it too is gone from the page cache; so once @folio is unlocked no locked, in-cache folio pins the inode, and a concurrent final iput() can evict and RCU-free it before i_mmap_unlock_read() touches i_mmap_rwsem: BUG: KASAN: slab-use-after-free in __up_read+0x634/0x790 i_mmap_unlock_read include/linux/fs.h:537 [inline] __folio_split+0x732/0x1640 mm/huge_memory.c:4100 try_to_split_thp_page+0xab/0x390 mm/memory-failure.c:1675 memory_failure+0x1394/0x26e0 mm/memory-failure.c:2470 Freed by task 4601: shmem_free_in_core_inode+0x54/0xb0 mm/shmem.c:5177 evict+0x57f/0xac0 fs/inode.c:870 Do every mapping dereference while @folio still pins the inode: drop i_mmap_rwsem right after remap_page(), before the loop that unlocks and frees the after-split folios, and clear @mapping so the exit path does not unlock it again. shmem_uncharge() and remap_page() already run before that point, so after this nothing past the unlock loop touches the inode or the mapping. This is now a rule the split depends on, alongside keeping @folio frozen until the page cache is updated: no inode or mapping dereference once the after-split folios start being unlocked.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < bc2f5eabaaf60ec18da70b619a8fba1bfb7dea3a (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < f87c08060818ebb19bafed37c38244538da25097 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < 6f5c272d71845a669e4c8ee5c72b376e29a0e6e5 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < be106f7855f03d3128ed0ce70ba74b484a90b473 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < e3dd774dbfd0b5bc2dbd0995221751b1234f8205 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < 10065fb891651d9541e7a5a2db84c1e656ece4f9 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < d640efe94d86d3be893d4c19220362546a637e90 (git)
Affected: baa355fd331424526e742d41d9b90d5f9d10f716 , < e923bd21058ea02fd0dcd3549d151d143fd036e5 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios\n\n__folio_split() keeps dereferencing the mapping after the split:\nshmem_uncharge(mapping-\u003ehost) and remap_page() while the folios are still\nfrozen/locked, and i_mmap_unlock_read(mapping) at the very end, after the\nafter-split folios have been unlocked and freed.\n\nNothing holds an inode reference across that.  The split relies on @folio\n-- which the beyond-EOF drop loop never removes, as it starts at\nfolio_next(folio) -- staying locked and in the page cache to hold off\neviction.  But the unlock loop unlocks @folio before i_mmap_unlock_read()\nruns.  If the caller\u0027s @lock_at is a tail beyond EOF, as memory_failure()\npasses when splitting a poisoned tail of a shmem THP that reaches past\ni_size during truncation, it too is gone from the page cache; so once\n@folio is unlocked no locked, in-cache folio pins the inode, and a\nconcurrent final iput() can evict and RCU-free it before\ni_mmap_unlock_read() touches i_mmap_rwsem:\n\n  BUG: KASAN: slab-use-after-free in __up_read+0x634/0x790\n   i_mmap_unlock_read include/linux/fs.h:537 [inline]\n   __folio_split+0x732/0x1640 mm/huge_memory.c:4100\n   try_to_split_thp_page+0xab/0x390 mm/memory-failure.c:1675\n   memory_failure+0x1394/0x26e0 mm/memory-failure.c:2470\n\n  Freed by task 4601:\n   shmem_free_in_core_inode+0x54/0xb0 mm/shmem.c:5177\n   evict+0x57f/0xac0 fs/inode.c:870\n\nDo every mapping dereference while @folio still pins the inode: drop\ni_mmap_rwsem right after remap_page(), before the loop that unlocks and\nfrees the after-split folios, and clear @mapping so the exit path does not\nunlock it again.  shmem_uncharge() and remap_page() already run before\nthat point, so after this nothing past the unlock loop touches the inode\nor the mapping.\n\nThis is now a rule the split depends on, alongside keeping @folio frozen\nuntil the page cache is updated: no inode or mapping dereference once the\nafter-split folios start being unlocked."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The UAF is in __folio_split() on the memory_failure()-\u003etry_to_split_thp_page() path while splitting file-backed shmem THPs; reachability is via local syscalls (memfd/mmap/madvise/ftruncate) or admin hwpoison injection, not network or physical interfaces.\nAC:L - An attacker can deterministically create a shmem THP with tail pages beyond EOF and race MADV_HWPOISON-driven memory_failure() against concurrent truncate/close(iput) using attacker-controlled threads; both sides of the race are attacker-driven.\nPR:L - Reliable exploitation uses MADV_HWPOISON to invoke memory_failure() on a chosen tail page; CAP_SYS_ADMIN is available to user-namespace/container root, and the shmem THP setup needs only ordinary local mapping and truncation privileges.\nUI:N - No separate victim action is required; the attacker creates, maps, poisons, and truncates their own memfd/shmem/tmpfs object to reach the vulnerable split path.\nS:U - Impact is a kernel slab use-after-free on inode/mapping metadata in core MM within the same kernel security domain, not a VM escape, sandbox breakout, or other cross-authority boundary violation.\nC:H - KASAN reports slab-use-after-free in i_mmap_unlock_read() after shmem_free_in_core_inode() RCU-frees the inode; this inode/mapping UAF can be heap-sprayed into an arbitrary kernel memory read primitive.\nI:H - The same UAF corrupts freed inode slab objects and i_mmap_rwsem state, enabling heap grooming for arbitrary kernel writes and potential privilege escalation via control-flow hijacking per kernel UAF guidance.\nA:H - The use-after-free provokes a KASAN BUG/oops during i_mmap_unlock_read() and corrupts core MM inode state, capable of kernel panic or hang when triggered on production shmem/tmpfs workloads."
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        "dateUpdated": "2026-08-19T16:37:38.544Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f87c08060818ebb19bafed37c38244538da25097"
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        {
          "url": "https://git.kernel.org/stable/c/e923bd21058ea02fd0dcd3549d151d143fd036e5"
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      ],
      "title": "mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios",
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    "cveId": "CVE-2026-74482",
    "datePublished": "2026-08-15T12:27:15.083Z",
    "dateReserved": "2026-08-15T05:44:03.904Z",
    "dateUpdated": "2026-08-19T16:37:38.544Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-74482",
      "date": "2026-08-28",
      "epss": "0.00126",
      "percentile": "0.02524"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T14:50:45.000Z",
      "cve": "CVE-2026-74482",
      "id": "msrc_CVE-2026-74482",
      "initial_release_date": "2026-08-23T14:50:45.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74482.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74482\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:53.053\",\"lastModified\":\"2026-08-19T17:21:05.477\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios\\n\\n__folio_split() keeps dereferencing the mapping after the split:\\nshmem_uncharge(mapping-\u003ehost) and remap_page() while the folios are still\\nfrozen/locked, and i_mmap_unlock_read(mapping) at the very end, after the\\nafter-split folios have been unlocked and freed.\\n\\nNothing holds an inode reference across that.  The split relies on @folio\\n-- which the beyond-EOF drop loop never removes, as it starts at\\nfolio_next(folio) -- staying locked and in the page cache to hold off\\neviction.  But the unlock loop unlocks @folio before i_mmap_unlock_read()\\nruns.  If the caller\u0027s @lock_at is a tail beyond EOF, as memory_failure()\\npasses when splitting a poisoned tail of a shmem THP that reaches past\\ni_size during truncation, it too is gone from the page cache; so once\\n@folio is unlocked no locked, in-cache folio pins the inode, and a\\nconcurrent final iput() can evict and RCU-free it before\\ni_mmap_unlock_read() touches i_mmap_rwsem:\\n\\n  BUG: KASAN: slab-use-after-free in __up_read+0x634/0x790\\n   i_mmap_unlock_read include/linux/fs.h:537 [inline]\\n   __folio_split+0x732/0x1640 mm/huge_memory.c:4100\\n   try_to_split_thp_page+0xab/0x390 mm/memory-failure.c:1675\\n   memory_failure+0x1394/0x26e0 mm/memory-failure.c:2470\\n\\n  Freed by task 4601:\\n   shmem_free_in_core_inode+0x54/0xb0 mm/shmem.c:5177\\n   evict+0x57f/0xac0 fs/inode.c:870\\n\\nDo every mapping dereference while @folio still pins the inode: drop\\ni_mmap_rwsem right after remap_page(), before the loop that unlocks and\\nfrees the after-split folios, and clear @mapping so the exit path does not\\nunlock it again.  shmem_uncharge() and remap_page() already run before\\nthat point, so after this nothing past the unlock loop touches the inode\\nor the mapping.\\n\\nThis is now a rule the split depends on, alongside keeping @folio frozen\\nuntil the page cache is updated: no inode or mapping dereference once the\\nafter-split folios start being unlocked.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/huge_memory.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"bc2f5eabaaf60ec18da70b619a8fba1bfb7dea3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"f87c08060818ebb19bafed37c38244538da25097\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"6f5c272d71845a669e4c8ee5c72b376e29a0e6e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"be106f7855f03d3128ed0ce70ba74b484a90b473\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"e3dd774dbfd0b5bc2dbd0995221751b1234f8205\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"10065fb891651d9541e7a5a2db84c1e656ece4f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"d640efe94d86d3be893d4c19220362546a637e90\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"baa355fd331424526e742d41d9b90d5f9d10f716\",\"lessThan\":\"e923bd21058ea02fd0dcd3549d151d143fd036e5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/huge_memory.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/10065fb891651d9541e7a5a2db84c1e656ece4f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f5c272d71845a669e4c8ee5c72b376e29a0e6e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc2f5eabaaf60ec18da70b619a8fba1bfb7dea3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be106f7855f03d3128ed0ce70ba74b484a90b473\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d640efe94d86d3be893d4c19220362546a637e90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3dd774dbfd0b5bc2dbd0995221751b1234f8205\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e923bd21058ea02fd0dcd3549d151d143fd036e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f87c08060818ebb19bafed37c38244538da25097\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:46:13+00:00",
      "cve": "CVE-2026-74482",
      "id": "CVE-2026-74482",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74482.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.