CVE-2026-74599 (GCVE-0-2026-74599)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-23 12:47
VLAI
Title
mm/ptdump: always stabilise against page table freeing using init_mm
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/ptdump: always stabilise against page table freeing using init_mm Previous commits have established the invariant that kernel page table freeing is performed while an mmap read lock on init_mm is held, which fixes races between ptdump and kernel page table freeing over init_mm. However, x86 and arm64 can perform a ptdump over an mm other than init_mm via ptdump_walk_pgd() and since kernel memory ranges are shared across non-kernel mm's, this means that the race still exists for these cases. Fix this by acquiring a nested mmap write lock for init_mm in ptdump_walk_pgd(). This is safe as we take this after mmap write locking the mm, and nothing acquires the init_mm lock first before locking an arbitrary mm, so no deadlock is possible. Also update walk_page_range_debug() to assert that init_mm is write locked, add a comment explaining why and remove some redundant code, and eliminate the unnecessary and confusing invocation of walk_kernel_page_table_range(). We can safely remove the non-NULL check for walk.mm, as the mmap lock asserts would NULL pointer deref if it was (and of course no callers do this). The first point at which ptdump can race kernel page table freeing is commit b6bdb7517c3d ("mm/vmalloc: add interfaces to free unmapped page table"), so we target this in the Fixes tag.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < 3c0391b9a774cc0854f3152e484a9d4835b12b40 (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < cbd9583bb6f70733d0022a66d3546a15c76ae744 (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < 76df4edf7d61ecb711bc517ff4c20a5e85c4e9f7 (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < b9c6d048bdfaae78d7d921b454f7de7baefaa2f0 (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < 7f740664aec1f832953c2e6d9b8920cd6c8bcc0c (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < 4adc4c9a9a43d61fe476dfe10811f3df2e7e4106 (git)
Affected: b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e , < 27c32e5538344b13c1505a08861e04620c125d47 (git)
Affected: 31895cfd79564111cdd5a9f48c5d491ae26a238e (git)
Affected: 9c7f7bdb1932f8c1e5f80d32c717184701afe701 (git)
Affected: acdb4981644c8e31ccee294bdefff475c0cf587b (git)
Affected: 0454e2fad9306961540ee7e84da47a8e345b7d22 (git)
Affected: 4.4.125 , < 4.5 (semver)
Affected: 4.9.91 , < 4.10 (semver)
Affected: 4.14.31 , < 4.15 (semver)
Affected: 4.15.14 , < 4.16 (semver)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/ptdump: always stabilise against page table freeing using init_mm\n\nPrevious commits have established the invariant that kernel page table\nfreeing is performed while an mmap read lock on init_mm is held, which\nfixes races between ptdump and kernel page table freeing over init_mm.\n\nHowever, x86 and arm64 can perform a ptdump over an mm other than init_mm\nvia ptdump_walk_pgd() and since kernel memory ranges are shared across\nnon-kernel mm\u0027s, this means that the race still exists for these cases.\n\nFix this by acquiring a nested mmap write lock for init_mm in\nptdump_walk_pgd().\n\nThis is safe as we take this after mmap write locking the mm, and nothing\nacquires the init_mm lock first before locking an arbitrary mm, so no\ndeadlock is possible.\n\nAlso update walk_page_range_debug() to assert that init_mm is write\nlocked, add a comment explaining why and remove some redundant code, and\neliminate the unnecessary and confusing invocation of\nwalk_kernel_page_table_range().\n\nWe can safely remove the non-NULL check for walk.mm, as the mmap lock\nasserts would NULL pointer deref if it was (and of course no callers do\nthis).\n\nThe first point at which ptdump can race kernel page table freeing is\ncommit b6bdb7517c3d (\"mm/vmalloc: add interfaces to free unmapped page\ntable\"), so we target this in the Fixes tag."
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      "version": "2"
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this after mmap write locking the mm, and nothing\\nacquires the init_mm lock first before locking an arbitrary mm, so no\\ndeadlock is possible.\\n\\nAlso update walk_page_range_debug() to assert that init_mm is write\\nlocked, add a comment explaining why and remove some redundant code, and\\neliminate the unnecessary and confusing invocation of\\nwalk_kernel_page_table_range().\\n\\nWe can safely remove the non-NULL check for walk.mm, as the mmap lock\\nasserts would NULL pointer deref if it was (and of course no callers do\\nthis).\\n\\nThe first point at which ptdump can race kernel page table freeing is\\ncommit b6bdb7517c3d (\\\"mm/vmalloc: add interfaces to free unmapped page\\ntable\\\"), so we target this in the Fixes tag.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"mm/pagewalk.c\",\"mm/ptdump.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"3c0391b9a774cc0854f3152e484a9d4835b12b40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"cbd9583bb6f70733d0022a66d3546a15c76ae744\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"76df4edf7d61ecb711bc517ff4c20a5e85c4e9f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"b9c6d048bdfaae78d7d921b454f7de7baefaa2f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"7f740664aec1f832953c2e6d9b8920cd6c8bcc0c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"4adc4c9a9a43d61fe476dfe10811f3df2e7e4106\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b6bdb7517c3d3f41f20e5c2948d6bc3f8897394e\",\"lessThan\":\"27c32e5538344b13c1505a08861e04620c125d47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"31895cfd79564111cdd5a9f48c5d491ae26a238e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9c7f7bdb1932f8c1e5f80d32c717184701afe701\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"acdb4981644c8e31ccee294bdefff475c0cf587b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0454e2fad9306961540ee7e84da47a8e345b7d22\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4.4.125\",\"lessThan\":\"4.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.9.91\",\"lessThan\":\"4.10\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.14.31\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.15.14\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"mm/pagewalk.c\",\"mm/ptdump.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/27c32e5538344b13c1505a08861e04620c125d47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c0391b9a774cc0854f3152e484a9d4835b12b40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4adc4c9a9a43d61fe476dfe10811f3df2e7e4106\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76df4edf7d61ecb711bc517ff4c20a5e85c4e9f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f740664aec1f832953c2e6d9b8920cd6c8bcc0c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9c6d048bdfaae78d7d921b454f7de7baefaa2f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cbd9583bb6f70733d0022a66d3546a15c76ae744\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T10:14:37+00:00",
      "cve": "CVE-2026-74599",
      "id": "CVE-2026-74599",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/ptdump: always stabilise against page table freeing using init_mm",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74599.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.