{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38393", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.011Z", "datePublished": "2025-07-25T12:53:38.104Z", "dateUpdated": "2026-08-05T12:01:32.069Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:01:32.069Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN\n\nWe found a few different systems hung up in writeback waiting on the same\npage lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in\npnfs_update_layout(), however the pnfs_layout_hdr's plh_outstanding count\nwas zero.\n\nIt seems most likely that this is another race between the waiter and waker\nsimilar to commit ed0172af5d6f (\"SUNRPC: Fix a race to wake a sync task\").\nFix it up by applying the advised barrier." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The entire waker side is driven by the remote pNFS server — CB_LAYOUTRECALL callbacks and NFS4ERR_BAD_STATEID/EXPIRED LAYOUTGET replies set NFS_LAYOUT_DRAIN, and the server controls when the LAYOUTGET reply lands and runs nfs_layoutget_end(). A hostile or compromised MDS, or an on-path attacker on a default AUTH_SYS/TCP mount, triggers the race entirely over the network.\nAC:L - The remote server can drive an unbounded stream of layout recalls and stateid-invalidating LAYOUTGET errors concurrently with the client's ongoing I/O, retrying the drain/wake cycle until the missed-wakeup window lands. The attacker controls the triggering side of the race and the retry rate, so the condition is not beyond their influence.\nPR:N - The NFS client holds no authentication requirement over the server — the client authenticates to the server, never the reverse, and under the default AUTH_SYS there is no server authentication at all. No credentials or privileges on the target system are needed.\nUI:N - Exploitation needs only normal read/writeback activity on an already-mounted pNFS filesystem (fstab, autofs, cloud NFS), which happens continuously without any victim action. No mount or file operation must be induced at exploit time.\nS:U - The lost wakeup hangs kernel tasks within the same security authority as the affected client kernel. No VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a missing memory barrier before wake_up_bit(); no memory is read out of bounds, freed, or exposed. No data is disclosed.\nI:N - No memory is corrupted and no data is modified — the task simply never wakes. There is no write primitive or control-flow influence.\nA:H - The waiter in pnfs_update_layout() sleeps indefinitely while holding the page lock, and other writeback tasks then block uninterruptibly on that same page lock, wedging writeback across the system as observed in production. This is a permanent hang producing hung-task watchdog splats and a panic when hung_task_panic is set." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/pnfs.c" ], "versions": [ { "version": "8acc3e228e1c90bd410f73597a4549e0409f22d6", "lessThan": "08287df60bac5b008b6bcdb03053988335d3d282", "status": "affected", "versionType": "git" }, { "version": "ec23a86e060cbe30b62eb2955adc97c92d80cc4c", "lessThan": "8846fd02c98da8b79e6343a20e6071be6f372180", "status": "affected", "versionType": "git" }, { "version": "880265c77ac415090090d1fe72a188fee71cb458", "lessThan": "e4b13885e7ef1e64e45268feef1e5f0707c47e72", "status": "affected", "versionType": "git" }, { "version": "880265c77ac415090090d1fe72a188fee71cb458", "lessThan": "8ca65fa71024a1767a59ffbc6a6e2278af84735e", "status": "affected", "versionType": "git" }, { "version": "880265c77ac415090090d1fe72a188fee71cb458", "lessThan": "864a54c1243ed3ca60baa4bc492dede1361f4c83", "status": "affected", "versionType": "git" }, { "version": "880265c77ac415090090d1fe72a188fee71cb458", "lessThan": "1f4da20080718f258e189a2c5f515385fa393da6", "status": "affected", "versionType": "git" }, { "version": "880265c77ac415090090d1fe72a188fee71cb458", "lessThan": "c01776287414ca43412d1319d2877cbad65444ac", "status": "affected", "versionType": "git" }, { "version": "f133819e24e78f3aaaa00e9fa2b816d5f73fd172", "status": "affected", "versionType": "git" }, { "version": "5.10.124", "lessThan": "5.10.240", "status": "affected", "versionType": "semver" }, { "version": "5.15.49", "lessThan": "5.15.187", "status": "affected", "versionType": "semver" }, { "version": "5.18.6", "lessThan": "5.19", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/nfs/pnfs.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.240", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.187", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.144", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.97", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.37", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.6", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.10.124", "versionEndExcluding": "5.10.240" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.49", "versionEndExcluding": "5.15.187" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.144" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.37" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.15.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/08287df60bac5b008b6bcdb03053988335d3d282" }, { "url": "https://git.kernel.org/stable/c/8846fd02c98da8b79e6343a20e6071be6f372180" }, { "url": "https://git.kernel.org/stable/c/e4b13885e7ef1e64e45268feef1e5f0707c47e72" }, { "url": "https://git.kernel.org/stable/c/8ca65fa71024a1767a59ffbc6a6e2278af84735e" }, { "url": "https://git.kernel.org/stable/c/864a54c1243ed3ca60baa4bc492dede1361f4c83" }, { "url": "https://git.kernel.org/stable/c/1f4da20080718f258e189a2c5f515385fa393da6" }, { "url": "https://git.kernel.org/stable/c/c01776287414ca43412d1319d2877cbad65444ac" } ], "title": "NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:37:26.857Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:41:58.708Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }