{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80531", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.764Z", "datePublished": "2026-08-26T14:37:08.594Z", "dateUpdated": "2026-08-27T05:01:25.229Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T05:01:25.229Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: avoid UAF on sc->tempip in xrep_tempfile_create\n\nLOLLM noticed a potential UAF if the tempfile creation code fails after\nit set sc->tempip. Fix that." } ], "metrics": [ { "cvssV3_1": { "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" }, "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 -> xfs_ioc_scrub_metadata -> xfs_scrub_metadata -> xrep_setup_* -> 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->tempip (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->tempip 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—a use-after-free enabling arbitrary kernel read.\nI:H - The stale sc->tempip 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->tempip 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/xfs/scrub/tempfile.c" ], "versions": [ { "version": "84c14ee39dd388d73054181c70b3f42af7ddc238", "lessThan": "08a20776ce33a2a52d856911e447c59424f0465a", "status": "affected", "versionType": "git" }, { "version": "84c14ee39dd388d73054181c70b3f42af7ddc238", "lessThan": "cd1f876d1bc2e94f271e07c606cacd85b109108a", "status": "affected", "versionType": "git" }, { "version": "84c14ee39dd388d73054181c70b3f42af7ddc238", "lessThan": "96246a3200d32a43766152e56bc7ae2d93604d74", "status": "affected", "versionType": "git" }, { "version": "84c14ee39dd388d73054181c70b3f42af7ddc238", "lessThan": "0c88e10d12de9ca7cbed1467bb1b52310101bff8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/xfs/scrub/tempfile.c" ], "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.105", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2" } ] } ] } ], "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->tempip in xrep_tempfile_create", "x_generator": { "engine": "bippy-1.2.0" } } } }