GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

FKIE_CVE-2026-72212

Vulnerability from fkie_nvd - Published: 2026-08-15 06:21 - Updated: 2026-08-17 06:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/memory_hotplug: fix incorrect altmap passing in error path In create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds with memmap_on_memory enabled, the vmemmap pages are allocated from params.altmap. If create_memory_block_devices() subsequently fails, the error path calls arch_remove_memory() with a NULL altmap instead of params.altmap. This is a bug that could lead to memory corruption. Since altmap is NULL, vmemmap_free() falls back to freeing the vmemmap pages into the system buddy allocator via free_pages() instead of the altmap. arch_remove_memory() then immediately destroys the physical linear mapping for this memory. This injects unowned pages into the buddy allocator, causing machine checks or memory corruption if the system later attempts to allocate and use those freed pages. Fix this by passing params.altmap to arch_remove_memory() in the error path.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f9e3ec17c3d2093c664c00a027588a446c39894
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2fac4afa0e2e68841334c78c1821e49f74fbc66a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3833e6abdbbfb59ec8203a84a84206cb7ffb41ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/722e6c54bde6391fb95f0357f555aca887c7b18c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/memory_hotplug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3833e6abdbbfb59ec8203a84a84206cb7ffb41ac",
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "versionType": "git"
            },
            {
              "lessThan": "722e6c54bde6391fb95f0357f555aca887c7b18c",
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "versionType": "git"
            },
            {
              "lessThan": "2f9e3ec17c3d2093c664c00a027588a446c39894",
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "versionType": "git"
            },
            {
              "lessThan": "2fac4afa0e2e68841334c78c1821e49f74fbc66a",
              "status": "affected",
              "version": "6b8f0798b85aa529011570369db985a788f3003f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/memory_hotplug.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/memory_hotplug: fix incorrect altmap passing in error path\n\nIn create_altmaps_and_memory_blocks(), when arch_add_memory() succeeds\nwith memmap_on_memory enabled, the vmemmap pages are allocated from\nparams.altmap.  If create_memory_block_devices() subsequently fails, the\nerror path calls arch_remove_memory() with a NULL altmap instead of\nparams.altmap.\n\nThis is a bug that could lead to memory corruption.  Since altmap is NULL,\nvmemmap_free() falls back to freeing the vmemmap pages into the system\nbuddy allocator via free_pages() instead of the altmap. \narch_remove_memory() then immediately destroys the physical linear mapping\nfor this memory.  This injects unowned pages into the buddy allocator,\ncausing machine checks or memory corruption if the system later attempts\nto allocate and use those freed pages.\n\nFix this by passing params.altmap to arch_remove_memory() in the error\npath."
    }
  ],
  "id": "CVE-2026-72212",
  "lastModified": "2026-08-17T06:18:22.150",
  "metrics": {},
  "published": "2026-08-15T06:21:39.913",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2f9e3ec17c3d2093c664c00a027588a446c39894"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2fac4afa0e2e68841334c78c1821e49f74fbc66a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3833e6abdbbfb59ec8203a84a84206cb7ffb41ac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/722e6c54bde6391fb95f0357f555aca887c7b18c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



Log in or create an account to share your comment.




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.