CVE-2024-40948 (GCVE-0-2024-40948)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:31 – Updated: 2026-05-11 20:22
VLAI
Title
mm/page_table_check: fix crash on ZONE_DEVICE
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: fix crash on ZONE_DEVICE Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages(). When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device: kernel BUG at mm/page_table_check.c:55! While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 51897f99351fff7b57f4f141940fa93b4e90fd2b (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 84d3549d54f5ff9fa3281257be3019386f51d1a0 (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < dec2382247860d2134c8d41e103e26460c099629 (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 8bb592c2eca8fd2bc06db7d80b38da18da4a2f43 (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.96 , ≤ 6.1.* (semver)
Unaffected: 6.6.36 , ≤ 6.6.* (semver)
Unaffected: 6.9.7 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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One example is ZONE_DEVICE\\npages: they map PFNs directly, and they don\u0027t allocate page_ext at all\\neven if there\u0027s struct page around.  One may reference\\ndevm_memremap_pages().\\n\\nWhen both ZONE_DEVICE and page-table-check enabled, then try to map some\\ndax memories, one can trigger kernel bug constantly now when the kernel\\nwas trying to inject some pfn maps on the dax device:\\n\\n kernel BUG at mm/page_table_check.c:55!\\n\\nWhile it\u0027s pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page\\nfault resolutions, skip all the checks if page_ext doesn\u0027t even exist in\\npgtable checker, which applies to ZONE_DEVICE but maybe more.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.96\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.36\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.7\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:18:34.368Z\"}}}",
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      "dataType": "CVE_RECORD",
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  }
}


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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.