CVE-2026-64244 (GCVE-0-2026-64244)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:29 – Updated: 2026-07-24 15:29
VLAI
Title
drivers/base/memory: set mem->altmap after successful device registration
Summary
In the Linux kernel, the following vulnerability has been resolved: drivers/base/memory: set mem->altmap after successful device registration If __add_memory_block() fails at xa_store() (under memory pressure for example), device_unregister() is called, which eventually triggers memory_block_release() with mem->altmap still set, causing a WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver. Fix this by delaying the assignment of mem->altmap until after __add_memory_block() has succeeded.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < 802e113cf120df7208e4c7e604950a85e87120a8 (git)
Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < 22dc0d042f02ce82aa61422ea5f232628bfd9e9c (git)
Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < 6c25bf4e44a2b6a14332f952bba0974521f5b72d (git)
Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < bc3dd82a0ffd488bb902f4c69c3d28fd4088d973 (git)
Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < 059ac6252a63edf1cea79bf30bd860a8c264b62c (git)
Affected: 1a8c64e110435e44e71bcd50a75663174b575f22 , < a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.37 , ≤ 6.18.* (semver)
Unaffected: 7.0.14 , ≤ 7.0.* (semver)
Unaffected: 7.1.2 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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      "cve": "CVE-2026-64244",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: drivers/base/memory: set mem-\u003ealtmap after successful device registration",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64244.json",
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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

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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.


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