Vulnerability-Lookup

GHSA-238F-5WX4-VRGF

Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-25 06:30

Details

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

md/raid5-ppl: fix use-after-free in ppl_do_flush()

The loop in ppl_do_flush() continues iterating after calling ppl_io_unit_finished(), touching io->pending_flushes and leading to a use-after-free.

Add a break statement to stop the loop once io is freed.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-93262"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-24T16:17:22Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5-ppl: fix use-after-free in ppl_do_flush()\n\nThe loop in ppl_do_flush() continues iterating after calling\nppl_io_unit_finished(), touching io-\u003epending_flushes and leading to a\nuse-after-free.\n\nAdd a break statement to stop the loop once io is freed.",
  "id": "GHSA-238f-5wx4-vrgf",
  "modified": "2026-09-25T06:30:28Z",
  "published": "2026-09-24T18:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93262"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/371f7a1b392edc8b7cf449cc7713179b588f2d0e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/455b56209f9615c3902dcc398dd867abb5ade3ab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8914c3d40870f16429a326e97e4016bedc6ede4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5123bf667ac29ddd8106f9ca7cc01316513ae66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf01f9413565e86673baf927291a088b6975692b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7505842f1329ece90cb9ea0db87772aeca44052"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e77c80670f2c2bf491da9b173931e1da4677c23a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcf21df7d3c50c8ebeb0757df5d21b02dcae4218"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-93262 (GCVE-0-2026-93262)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:52 – Updated: 2026-09-25 05:09

Title

md/raid5-ppl: fix use-after-free in ppl_do_flush()

Summary

In the Linux kernel, the following vulnerability has been resolved: md/raid5-ppl: fix use-after-free in ppl_do_flush() The loop in ppl_do_flush() continues iterating after calling ppl_io_unit_finished(), touching io->pending_flushes and leading to a use-after-free. Add a break statement to stop the loop once io is freed.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/cf01f9413565e8667…
https://git.kernel.org/stable/c/e7505842f1329ece9…
https://git.kernel.org/stable/c/b5123bf667ac29ddd…
https://git.kernel.org/stable/c/e77c80670f2c2bf49…
https://git.kernel.org/stable/c/8914c3d40870f1642…
https://git.kernel.org/stable/c/455b56209f9615c39…
https://git.kernel.org/stable/c/fcf21df7d3c50c8eb…
https://git.kernel.org/stable/c/371f7a1b392edc8b7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < cf01f9413565e86673baf927291a088b6975692b (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < e7505842f1329ece90cb9ea0db87772aeca44052 (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < b5123bf667ac29ddd8106f9ca7cc01316513ae66 (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < e77c80670f2c2bf491da9b173931e1da4677c23a (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < 8914c3d40870f16429a326e97e4016bedc6ede4c (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < 455b56209f9615c3902dcc398dd867abb5ade3ab (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < fcf21df7d3c50c8ebeb0757df5d21b02dcae4218 (git) Affected: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 , < 371f7a1b392edc8b7cf449cc7713179b588f2d0e (git)
Linux	Linux	Affected: 4.16 Unaffected: 0 , < 4.16 (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: 6.18.52 , ≤ 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/raid5-ppl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cf01f9413565e86673baf927291a088b6975692b",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "e7505842f1329ece90cb9ea0db87772aeca44052",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "b5123bf667ac29ddd8106f9ca7cc01316513ae66",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "e77c80670f2c2bf491da9b173931e1da4677c23a",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "8914c3d40870f16429a326e97e4016bedc6ede4c",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "455b56209f9615c3902dcc398dd867abb5ade3ab",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
            {
              "lessThan": "fcf21df7d3c50c8ebeb0757df5d21b02dcae4218",
              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "1532d9e87e8b2377f12929f9e40724d5fbe6ecc5",
              "versionType": "git"
            }
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/md/raid5-ppl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "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": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "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": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5-ppl: fix use-after-free in ppl_do_flush()\n\nThe loop in ppl_do_flush() continues iterating after calling\nppl_io_unit_finished(), touching io-\u003epending_flushes and leading to a\nuse-after-free.\n\nAdd a break statement to stop the loop once io is freed."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The patched ppl_do_flush() runs from ppl_stripe_write_finished() after RAID5 stripe data+parity I/O completes. Those writes enter via md_submit_bio() -\u003e raid5_make_request() from local write(2) to a filesystem or /dev/md*; ppl_submit_iounit() only sets disk_flush_bitmap from local stripe R5_Wantwrite/wb_cache_on state, not from a network protocol message.\nAC:L - Writes the attacker issues are logged by ppl_write_stripe()/ppl_log_stripe() and ppl_submit_iounit() sets disk_flush_bitmap for child_logs[i].wb_cache_on members. When pending_stripes hits 0, ppl_stripe_write_finished() calls ppl_do_flush(); the remainder loop\u0027s missing break after ppl_io_unit_finished() is a logic bug on that path, not a second-actor race or a disk-fault precondition.\nPR:L - md_submit_bio() and raid5_make_request() have no capability check; md_ioctl()\u0027s capable(CAP_SYS_ADMIN) applies only to array-management ioctls, not I/O. An unprivileged user who can write a filesystem on the RAID5+PPL array (or /dev/md* with disk-group write access) reaches ppl_do_flush() without init-namespace root.\nUI:N - The attacker triggers ppl_do_flush() through their own writes: raid5 handle_stripe()/handle_stripe_clean_event() calls ppl_stripe_write_finished() on I/O they submitted. No victim action such as mounting an image or plugging a device is required.\nS:U - ppl_io_unit_finished() mempool_free()s the ppl_io_unit from ppl_conf-\u003eio_pool in the host md/raid5 kernel. The later dangling atomic_dec_and_test(\u0026io-\u003epending_flushes) in ppl_do_flush() stays in that kernel\u0027s authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - ppl_io_unit_finished() returns the ppl_io_unit to io_pool via mempool_free(); ppl_do_flush()\u0027s remainder loop then does atomic_dec_and_test(\u0026io-\u003epending_flushes) on that freed kmem_cache object. A UAF of the recycled io_unit header is a kernel read primitive against adjacent/reconstituted pool memory.\nI:H - The same dangling io is a writeable ppl_io_unit: atomic_dec_and_test() mutates pending_flushes on a recycled object, and another true dec_and_test would call ppl_io_unit_finished() again (list_del/mempool_free of a live unit). That is a kernel write/double-free primitive on the PPL io_unit cache.\nA:H - Use-after-free of the mempool ppl_io_unit in ppl_do_flush() after ppl_io_unit_finished() can oops on the stale pending_flushes access or corrupt list_del() pointers in a second finish, panicking the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T05:09:54.351Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cf01f9413565e86673baf927291a088b6975692b"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7505842f1329ece90cb9ea0db87772aeca44052"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5123bf667ac29ddd8106f9ca7cc01316513ae66"
        },
        {
          "url": "https://git.kernel.org/stable/c/e77c80670f2c2bf491da9b173931e1da4677c23a"
        },
        {
          "url": "https://git.kernel.org/stable/c/8914c3d40870f16429a326e97e4016bedc6ede4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/455b56209f9615c3902dcc398dd867abb5ade3ab"
        },
        {
          "url": "https://git.kernel.org/stable/c/fcf21df7d3c50c8ebeb0757df5d21b02dcae4218"
        },
        {
          "url": "https://git.kernel.org/stable/c/371f7a1b392edc8b7cf449cc7713179b588f2d0e"
        }
      ],
      "title": "md/raid5-ppl: fix use-after-free in ppl_do_flush()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93262",
    "datePublished": "2026-09-24T15:52:01.886Z",
    "dateReserved": "2026-09-17T16:02:15.097Z",
    "dateUpdated": "2026-09-25T05:09:54.351Z",
    "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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GHSA-238F-5WX4-VRGF

CVE-2026-93262 (GCVE-0-2026-93262)

Tags

Sightings

Nomenclature

Related by attack behaviour