Vulnerability-Lookup

GHSA-2JF4-529G-MPWH

Vulnerability from github – Published: 2026-08-27 06:31 – Updated: 2026-08-27 06:31

Details

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

xfs: avoid UAF on sc->tempip in xrep_tempfile_create

LOLLM noticed a potential UAF if the tempfile creation code fails after it set sc->tempip. Fix that.

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-2026-80531"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T15:17:07Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: avoid UAF on sc-\u003etempip in xrep_tempfile_create\n\nLOLLM noticed a potential UAF if the tempfile creation code fails after\nit set sc-\u003etempip.  Fix that.",
  "id": "GHSA-2jf4-529g-mpwh",
  "modified": "2026-08-27T06:31:31Z",
  "published": "2026-08-27T06:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80531"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08a20776ce33a2a52d856911e447c59424f0465a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c88e10d12de9ca7cbed1467bb1b52310101bff8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96246a3200d32a43766152e56bc7ae2d93604d74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd1f876d1bc2e94f271e07c606cacd85b109108a"
    }
  ],
  "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-2026-80531 (GCVE-0-2026-80531)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01

Title

xfs: avoid UAF on sc->tempip in xrep_tempfile_create

Summary

In the Linux kernel, the following vulnerability has been resolved: xfs: avoid UAF on sc->tempip in xrep_tempfile_create LOLLM noticed a potential UAF if the tempfile creation code fails after it set sc->tempip. Fix that.

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

4 references

URL	Tags
https://git.kernel.org/stable/c/08a20776ce33a2a52…
https://git.kernel.org/stable/c/cd1f876d1bc2e94f2…
https://git.kernel.org/stable/c/96246a3200d32a437…
https://git.kernel.org/stable/c/0c88e10d12de9ca7c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 08a20776ce33a2a52d856911e447c59424f0465a (git) Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < cd1f876d1bc2e94f271e07c606cacd85b109108a (git) Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 96246a3200d32a43766152e56bc7ae2d93604d74 (git) Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 0c88e10d12de9ca7cbed1467bb1b52310101bff8 (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.12.105 , ≤ 6.12.* (semver) Unaffected: 6.18.46 , ≤ 6.18.* (semver) Unaffected: 7.1.10 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/tempfile.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "08a20776ce33a2a52d856911e447c59424f0465a",
              "status": "affected",
              "version": "84c14ee39dd388d73054181c70b3f42af7ddc238",
              "versionType": "git"
            },
            {
              "lessThan": "cd1f876d1bc2e94f271e07c606cacd85b109108a",
              "status": "affected",
              "version": "84c14ee39dd388d73054181c70b3f42af7ddc238",
              "versionType": "git"
            },
            {
              "lessThan": "96246a3200d32a43766152e56bc7ae2d93604d74",
              "status": "affected",
              "version": "84c14ee39dd388d73054181c70b3f42af7ddc238",
              "versionType": "git"
            },
            {
              "lessThan": "0c88e10d12de9ca7cbed1467bb1b52310101bff8",
              "status": "affected",
              "version": "84c14ee39dd388d73054181c70b3f42af7ddc238",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/xfs/scrub/tempfile.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "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": "6.12.105",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.46",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.10",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: avoid UAF on sc-\u003etempip in xrep_tempfile_create\n\nLOLLM noticed a potential UAF if the tempfile creation code fails after\nit set sc-\u003etempip.  Fix that."
        }
      ],
      "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 bug is only reachable via XFS_IOC_SCRUB_METADATA or XFS_IOC_SCRUBV_METADATA ioctl on an open XFS file descriptor (xfs_file_ioctl -\u003e xfs_ioc_scrub_metadata -\u003e xfs_scrub_metadata -\u003e xrep_setup_* -\u003e xrep_tempfile_create); it is not exposed through NFS, SMB, or other network-facing kernel services.\nAC:L - An attacker with ioctl access can deterministically hit the error path by invoking online repair (XFS_SCRUB_IFLAG_REPAIR) and forcing tempfile creation to fail after xfs_icreate sets sc-\u003etempip (e.g., ENOSPC from filling the filesystem or EIO), without races or uncontrollable victim state.\nPR:L - Both scrub ioctl handlers enforce capable(CAP_SYS_ADMIN), which is obtainable by unprivileged users who map root in a user namespace and mount their own XFS filesystem to run online scrub/repair, consistent with other XFS scrub CVE scoring.\nUI:N - Exploitation requires no victim interaction; the attacker issues the scrub/repair ioctl themselves once they have the required privileges and can induce the tempfile-creation failure.\nS:U - Impact is kernel memory corruption and crash within the same kernel security domain during XFS online repair teardown; this does not cross VM, container, or IOMMU security boundaries.\nC:H - On failure after sc-\u003etempip is set, xrep_tempfile_create releases the inode but left a dangling pointer; xchk_teardown then calls xrep_tempfile_rele which performs xfs_is_metadir_inode, xfs_iunlock, and xchk_irele on freed xfs_inode memory\u2014a use-after-free enabling arbitrary kernel read.\nI:H - The stale sc-\u003etempip is dereferenced in xrep_tempfile_rele for locking, metadir cleanup, and inode release on freed memory; UAF on xfs_inode structures can corrupt heap metadata and be leveraged for arbitrary kernel write or control-flow hijacking.\nA:H - Use-after-free on sc-\u003etempip during xchk_teardown provokes double-free, invalid inode lock operations, or kernel oops/panic when online repair setup fails after partial tempfile creation, causing complete host denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T05:01:25.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/08a20776ce33a2a52d856911e447c59424f0465a"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd1f876d1bc2e94f271e07c606cacd85b109108a"
        },
        {
          "url": "https://git.kernel.org/stable/c/96246a3200d32a43766152e56bc7ae2d93604d74"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c88e10d12de9ca7cbed1467bb1b52310101bff8"
        }
      ],
      "title": "xfs: avoid UAF on sc-\u003etempip in xrep_tempfile_create",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80531",
    "datePublished": "2026-08-26T14:37:08.594Z",
    "dateReserved": "2026-08-26T14:34:25.764Z",
    "dateUpdated": "2026-08-27T05:01:25.229Z",
    "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-2JF4-529G-MPWH

CVE-2026-80531 (GCVE-0-2026-80531)

Tags

Sightings

Nomenclature