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

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 08a20776ce33a2a52d856911e447c59424f0465a (git)
Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < cd1f876d1bc2e94f271e07c606cacd85b109108a (git)
Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 96246a3200d32a43766152e56bc7ae2d93604d74 (git)
Affected: 84c14ee39dd388d73054181c70b3f42af7ddc238 , < 0c88e10d12de9ca7cbed1467bb1b52310101bff8 (git)
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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": [
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "7.1.10",
              "versionType": "semver"
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.105",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
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                  "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80531",
      "date": "2026-09-01",
      "epss": "0.00128",
      "percentile": "0.02782"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80531\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-26T15:17:07.140\",\"lastModified\":\"2026-08-27T06:17:33.500\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/xfs/scrub/tempfile.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"84c14ee39dd388d73054181c70b3f42af7ddc238\",\"lessThan\":\"08a20776ce33a2a52d856911e447c59424f0465a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84c14ee39dd388d73054181c70b3f42af7ddc238\",\"lessThan\":\"cd1f876d1bc2e94f271e07c606cacd85b109108a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84c14ee39dd388d73054181c70b3f42af7ddc238\",\"lessThan\":\"96246a3200d32a43766152e56bc7ae2d93604d74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"84c14ee39dd388d73054181c70b3f42af7ddc238\",\"lessThan\":\"0c88e10d12de9ca7cbed1467bb1b52310101bff8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/xfs/scrub/tempfile.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08a20776ce33a2a52d856911e447c59424f0465a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0c88e10d12de9ca7cbed1467bb1b52310101bff8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96246a3200d32a43766152e56bc7ae2d93604d74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cd1f876d1bc2e94f271e07c606cacd85b109108a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T17:11:22+00:00",
      "cve": "CVE-2026-80531",
      "id": "CVE-2026-80531",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfs: avoid UAF on sc-\u003etempip in xrep_tempfile_create",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80531.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.


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