CVE-2026-93262 (GCVE-0-2026-93262)
Vulnerability from cvelistv5
Published
2026-09-24 15:52
Modified
2026-10-19 09:08
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
Version: 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5
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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": [
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          "product": "Linux",
          "programFiles": [
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          ],
          "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"
            },
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              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
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              "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"
            },
            {
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.221",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.6.157",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "7.3",
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                  "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": "2026-10-19T09:08:15.484Z",
        "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": "2026-10-19T09:08:15.484Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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