Vulnerability-Lookup

FKIE_CVE-2026-89953

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 11:17

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: mtd: mtdoops: free page bitmap when the backing MTD is removed mtdoops_notify_add() allocates oops_page_used when the configured MTD device is registered. mtdoops_notify_remove() detaches from that device but leaves the bitmap allocated. If the same MTD device is later registered again, the add path allocates a new bitmap and overwrites the old pointer, leaking one vmalloc allocation per remove/add cycle. This is only visible when the backing MTD device can disappear and be registered again while mtdoops remains loaded, so the usual static MTD case does not expose it. Free the bitmap after unregistering the dumper and flushing the pending workers, then clear the pointer and page count before a later attach can allocate fresh state. Clearing the pointer also keeps the module exit path from freeing the same bitmap a second time after a remove event.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1e5cd8bc902331ff801df88cbb299029ae062753
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/477d61d54e097e90f748aa18d013805abd56bcbd
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/698944132083d143ef965c0090ee14ba1d9e1a5f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8414f0e9f707226de20b48c7048179fd86d352fc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/956e7da12c114f13c63d126ab1d79c3b6a819060
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a91ac71e67c3e01ed9afd9841435bebb930293f8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d06f91a52af11630c9f7e487f6daf242ac310cb8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f25c804947e0a28c15e73da8e2e0db959cbed716

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdoops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "477d61d54e097e90f748aa18d013805abd56bcbd",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "a91ac71e67c3e01ed9afd9841435bebb930293f8",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "698944132083d143ef965c0090ee14ba1d9e1a5f",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "f25c804947e0a28c15e73da8e2e0db959cbed716",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "8414f0e9f707226de20b48c7048179fd86d352fc",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "d06f91a52af11630c9f7e487f6daf242ac310cb8",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "1e5cd8bc902331ff801df88cbb299029ae062753",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "956e7da12c114f13c63d126ab1d79c3b6a819060",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdoops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "lessThan": "2.6.33",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nmtd: mtdoops: free page bitmap when the backing MTD is removed\n\nmtdoops_notify_add() allocates oops_page_used when the configured MTD\ndevice is registered.  mtdoops_notify_remove() detaches from that device\nbut leaves the bitmap allocated.  If the same MTD device is later\nregistered again, the add path allocates a new bitmap and overwrites the\nold pointer, leaking one vmalloc allocation per remove/add cycle.\n\nThis is only visible when the backing MTD device can disappear and be\nregistered again while mtdoops remains loaded, so the usual static MTD\ncase does not expose it.\n\nFree the bitmap after unregistering the dumper and flushing the pending\nworkers, then clear the pointer and page count before a later attach can\nallocate fresh state.  Clearing the pointer also keeps the module exit\npath from freeing the same bitmap a second time after a remove event."
    }
  ],
  "id": "CVE-2026-89953",
  "lastModified": "2026-09-16T11:17:05.530",
  "metrics": {},
  "published": "2026-09-16T11:17:05.530",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1e5cd8bc902331ff801df88cbb299029ae062753"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/477d61d54e097e90f748aa18d013805abd56bcbd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/698944132083d143ef965c0090ee14ba1d9e1a5f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8414f0e9f707226de20b48c7048179fd86d352fc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/956e7da12c114f13c63d126ab1d79c3b6a819060"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a91ac71e67c3e01ed9afd9841435bebb930293f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d06f91a52af11630c9f7e487f6daf242ac310cb8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f25c804947e0a28c15e73da8e2e0db959cbed716"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-89953 (GCVE-0-2026-89953)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32

Title

mtd: mtdoops: free page bitmap when the backing MTD is removed

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/477d61d54e097e90f…
https://git.kernel.org/stable/c/a91ac71e67c3e01ed…
https://git.kernel.org/stable/c/698944132083d143e…
https://git.kernel.org/stable/c/f25c804947e0a28c1…
https://git.kernel.org/stable/c/8414f0e9f707226de…
https://git.kernel.org/stable/c/d06f91a52af11630c…
https://git.kernel.org/stable/c/1e5cd8bc902331ff8…
https://git.kernel.org/stable/c/956e7da12c114f13c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < 477d61d54e097e90f748aa18d013805abd56bcbd (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < a91ac71e67c3e01ed9afd9841435bebb930293f8 (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < 698944132083d143ef965c0090ee14ba1d9e1a5f (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < f25c804947e0a28c15e73da8e2e0db959cbed716 (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < 8414f0e9f707226de20b48c7048179fd86d352fc (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < d06f91a52af11630c9f7e487f6daf242ac310cb8 (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < 1e5cd8bc902331ff801df88cbb299029ae062753 (git) Affected: be95745f01677245a061a8f51473ef5ec8ad008e , < 956e7da12c114f13c63d126ab1d79c3b6a819060 (git)
Linux	Linux	Affected: 2.6.33 Unaffected: 0 , < 2.6.33 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdoops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "477d61d54e097e90f748aa18d013805abd56bcbd",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "a91ac71e67c3e01ed9afd9841435bebb930293f8",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "698944132083d143ef965c0090ee14ba1d9e1a5f",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "f25c804947e0a28c15e73da8e2e0db959cbed716",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "8414f0e9f707226de20b48c7048179fd86d352fc",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "d06f91a52af11630c9f7e487f6daf242ac310cb8",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "1e5cd8bc902331ff801df88cbb299029ae062753",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            },
            {
              "lessThan": "956e7da12c114f13c63d126ab1d79c3b6a819060",
              "status": "affected",
              "version": "be95745f01677245a061a8f51473ef5ec8ad008e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdoops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "lessThan": "2.6.33",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "2.6.33",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mtdoops: free page bitmap when the backing MTD is removed\n\nmtdoops_notify_add() allocates oops_page_used when the configured MTD\ndevice is registered.  mtdoops_notify_remove() detaches from that device\nbut leaves the bitmap allocated.  If the same MTD device is later\nregistered again, the add path allocates a new bitmap and overwrites the\nold pointer, leaking one vmalloc allocation per remove/add cycle.\n\nThis is only visible when the backing MTD device can disappear and be\nregistered again while mtdoops remains loaded, so the usual static MTD\ncase does not expose it.\n\nFree the bitmap after unregistering the dumper and flushing the pending\nworkers, then clear the pointer and page count before a later attach can\nallocate fresh state.  Clearing the pointer also keeps the module exit\npath from freeing the same bitmap a second time after a remove event."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T10:32:37.676Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/477d61d54e097e90f748aa18d013805abd56bcbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/a91ac71e67c3e01ed9afd9841435bebb930293f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/698944132083d143ef965c0090ee14ba1d9e1a5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f25c804947e0a28c15e73da8e2e0db959cbed716"
        },
        {
          "url": "https://git.kernel.org/stable/c/8414f0e9f707226de20b48c7048179fd86d352fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/d06f91a52af11630c9f7e487f6daf242ac310cb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e5cd8bc902331ff801df88cbb299029ae062753"
        },
        {
          "url": "https://git.kernel.org/stable/c/956e7da12c114f13c63d126ab1d79c3b6a819060"
        }
      ],
      "title": "mtd: mtdoops: free page bitmap when the backing MTD is removed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89953",
    "datePublished": "2026-09-16T10:32:37.676Z",
    "dateReserved": "2026-09-11T19:38:34.777Z",
    "dateUpdated": "2026-09-16T10:32:37.676Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-89953

CVE-2026-89953 (GCVE-0-2026-89953)

Tags

Sightings

Nomenclature

Related by attack behaviour