Vulnerability-Lookup

GHSA-M9QC-PW52-GVJM

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

dm-pcache: validate the persisted dirty_tail chain at load

The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever.

Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93198"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:18:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate the persisted dirty_tail chain at load\n\nThe writeback worker follows the persisted dirty_tail chain, which is\ndecoded from the cache device independently of the key_tail chain that\ncache_replay() walks and bounds. A crafted image, whose on-media fields are\nauthenticated only by a crc32c with a fixed seed, can aim dirty_tail at a\nchain of last ksets that never terminates, so cache_writeback_fn() re-arms\nitself with no delay forever.\n\nWalk the dirty_tail chain once at load with the same hop cap cache_replay()\nuses and fail the table load with -EIO if it does not reach an end within\nn_segs hops.",
  "id": "GHSA-m9qc-pw52-gvjm",
  "modified": "2026-09-17T18:32:14Z",
  "published": "2026-09-17T18:32:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93198"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4822a030929e0e77aa380722dc42e3e4c9edd346"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8195cf3f4a82ef49d9b0651c507ed0784caf23fb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-93198 (GCVE-0-2026-93198)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12

Title

dm-pcache: validate the persisted dirty_tail chain at load

Summary

In the Linux kernel, the following vulnerability has been resolved: dm-pcache: validate the persisted dirty_tail chain at load The writeback worker follows the persisted dirty_tail chain, which is decoded from the cache device independently of the key_tail chain that cache_replay() walks and bounds. A crafted image, whose on-media fields are authenticated only by a crc32c with a fixed seed, can aim dirty_tail at a chain of last ksets that never terminates, so cache_writeback_fn() re-arms itself with no delay forever. Walk the dirty_tail chain once at load with the same hop cap cache_replay() uses and fail the table load with -EIO if it does not reach an end within n_segs hops.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/8195cf3f4a82ef49d…
https://git.kernel.org/stable/c/4822a030929e0e77a…
https://git.kernel.org/stable/c/58d620ee9e01d4bdb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 , < 8195cf3f4a82ef49d9b0651c507ed0784caf23fb (git) Affected: 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 , < 4822a030929e0e77aa380722dc42e3e4c9edd346 (git) Affected: 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 , < 58d620ee9e01d4bdbceaf2ae1450d307a2a9d58b (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/dm-pcache/cache.c",
            "drivers/md/dm-pcache/cache.h",
            "drivers/md/dm-pcache/cache_key.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "lessThan": "4822a030929e0e77aa380722dc42e3e4c9edd346",
              "status": "affected",
              "version": "1d57628ff95b32d5cfa8d8f50e07690c161e9cf0",
              "versionType": "git"
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              "versionType": "git"
            }
          ]
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "versions": [
            {
              "status": "affected",
              "version": "6.18"
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              "status": "unaffected",
              "version": "0",
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            },
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            },
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              "status": "unaffected",
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          "nodes": [
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                  "vulnerable": true
                },
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                },
                {
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                }
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-pcache: validate the persisted dirty_tail chain at load\n\nThe writeback worker follows the persisted dirty_tail chain, which is\ndecoded from the cache device independently of the key_tail chain that\ncache_replay() walks and bounds. A crafted image, whose on-media fields are\nauthenticated only by a crc32c with a fixed seed, can aim dirty_tail at a\nchain of last ksets that never terminates, so cache_writeback_fn() re-arms\nitself with no delay forever.\n\nWalk the dirty_tail chain once at load with the same hop cap cache_replay()\nuses and fail the table load with -EIO if it does not reach an end within\nn_segs hops."
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    "dateReserved": "2026-09-17T16:02:15.092Z",
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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