Vulnerability-Lookup

GHSA-4W7V-GF5R-FHPH

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

md/raid10: reset read_slot when reusing r10bio for discard

put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio.

Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74376"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:39Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio-\u003eread_slot \u003c 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly.",
  "id": "GHSA-4w7v-gf5r-fhph",
  "modified": "2026-08-17T06:33:41Z",
  "published": "2026-08-15T06:32:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74376"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74376 (GCVE-0-2026-74376)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46

Title

md/raid10: reset read_slot when reusing r10bio for discard

Summary

In the Linux kernel, the following vulnerability has been resolved: md/raid10: reset read_slot when reusing r10bio for discard put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio. Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.

Severity

9.8 (Critical)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/3cb2a606ce4902ece…
https://git.kernel.org/stable/c/561c9711e4f545d64…
https://git.kernel.org/stable/c/ce3030e92f1436288…
https://git.kernel.org/stable/c/742e4afd247d9c972…
https://git.kernel.org/stable/c/b7313f23ea5a79b19…
https://git.kernel.org/stable/c/eb04e3e9c14ed1591…
https://git.kernel.org/stable/c/6b8a26af065ddc93d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < 3cb2a606ce4902eceabe68338df0653312f861f8 (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < 561c9711e4f545d6464a023168bdee03b00fa945 (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < ce3030e92f14362880055de5fe3c258971118853 (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < 742e4afd247d9c972695227716b03d432a7e1d26 (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < b7313f23ea5a79b199a007bfad64a866cc2c22e7 (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < eb04e3e9c14ed15914f5fd2eae8b6435f54f095f (git) Affected: d30588b2731fb01e1616cf16c3fe79a1443e29aa , < 6b8a26af065ddc93de2aa5c9f0df98dce9723442 (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/raid10.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3cb2a606ce4902eceabe68338df0653312f861f8",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "561c9711e4f545d6464a023168bdee03b00fa945",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "ce3030e92f14362880055de5fe3c258971118853",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "742e4afd247d9c972695227716b03d432a7e1d26",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "b7313f23ea5a79b199a007bfad64a866cc2c22e7",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "eb04e3e9c14ed15914f5fd2eae8b6435f54f095f",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            },
            {
              "lessThan": "6b8a26af065ddc93de2aa5c9f0df98dce9723442",
              "status": "affected",
              "version": "d30588b2731fb01e1616cf16c3fe79a1443e29aa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/raid10.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio-\u003eread_slot \u003c 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - iSCSI/NVMe-oF targets and appliances commonly expose RAID10-backed LUNs; remote SCSI UNMAP maps through target_core iblock_execute_unmap()/blkdev_issue_discard() to md_handle_request() and raid10_handle_discard without local access.\nAC:L - The attacker controls both pool poisoning reads and triggering discards; mempool-reused r10bios retain a non-negative read_slot from prior reads, so each qualifying discard reliably skips repl_bio bio_put() when replacement mirrors exist.\nPR:N - Network UNMAP from an iSCSI/NVMe-oF client needs no Linux UID or capabilities on the target; local exploitation only needs O_RDWR on the md device or FITRIM (CAP_SYS_ADMIN, obtainable in user namespaces), both below High.\nUI:N - No interactive victim action\u2014exploitation uses normal block-layer discard requests (fstrim cron, UNMAP, BLKDISCARD) issued or scripted by the attacker without cooperation.\nS:U - The bug corrupts/leaks kernel bio objects within the same host kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - Stale read_slot misclassifies repl_bio as rdev in the r10dev union during put_all_bios(), leaking live bios holding kernel pointers and enabling heap-grooming read primitives; scored High when uncertain per memory-corruption guidance.\nI:H - The read_slot/repl_bio union type confusion skips bio_put() on attacker-submitted replacement discard clones, enabling slab manipulation for arbitrary kernel writes; type confusion maps to High integrity impact per kernel CVSS guidance.\nA:H - Repeated read-then-discard cycles leak bios on every hit; on busy RAID10 storage servers this exhausts kmem and can trigger OOM killer or panic, so Availability is High rather than Low per the conservative rule."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:28.657Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"
        },
        {
          "url": "https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"
        }
      ],
      "title": "md/raid10: reset read_slot when reusing r10bio for discard",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74376",
    "datePublished": "2026-08-15T05:58:55.023Z",
    "dateReserved": "2026-08-15T05:44:03.889Z",
    "dateUpdated": "2026-08-17T05:46:28.657Z",
    "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.

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.

Action not permitted

GHSA-4W7V-GF5R-FHPH

CVE-2026-74376 (GCVE-0-2026-74376)

Tags

Sightings

Nomenclature