{"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 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