{"api_version":"1","generated_at":"2026-07-20T18:13:41+00:00","cve":"CVE-2026-53393","urls":{"html":"https://cve.report/CVE-2026-53393","api":"https://cve.report/api/cve/CVE-2026-53393.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53393","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53393"},"summary":{"title":"nfsd: reset write verifier on deferred writeback errors","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reset write verifier on deferred writeback errors\n\nnfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to\ndetect deferred writeback errors, but neither rotates the server's write\nverifier (nn->writeverf) when this check fails. Every other\ndurable-storage-failure path in these functions calls\ncommit_reset_write_verifier() before returning an error.\n\nThe missing rotation means clients holding UNSTABLE write data under the\ncurrent verifier will COMMIT, receive the unchanged verifier back, and\nconclude their data is durable — silently dropping data that failed\nwriteback. This violates the UNSTABLE+COMMIT durability contract\n(RFC 1813 §3.3.7, RFC 8881 §18.32).\n\nAdd commit_reset_write_verifier() calls at both filemap_check_wb_err()\nerror sites, matching the pattern used by adjacent error paths in the\nsame functions. The helper already filters -EAGAIN and -ESTALE\ninternally, so the calls are unconditionally safe.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 12:16:50","updated_at":"2026-07-19 12:16:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f","name":"https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd","name":"https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e","name":"https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7","name":"https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53393","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53393","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 4367afc119c51e17a616f6908772b7e2c2c4013f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb b027cca33c97354149fcc0ddeede4525c41093cd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 555dbf1a9aac6d3150c8b52fa35f768a692f4eeb 2090b05803faab8a9fa62fbff871007862cac1b7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f14816f2f928c560d28ba344af689f56efcd6f55 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3145fe0ebb16e1715ad541a301bc6675c8375fcd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.124 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.49 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.95 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.38 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.3 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/nfsd/vfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e","status":"affected","version":"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb","versionType":"git"},{"lessThan":"4367afc119c51e17a616f6908772b7e2c2c4013f","status":"affected","version":"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb","versionType":"git"},{"lessThan":"b027cca33c97354149fcc0ddeede4525c41093cd","status":"affected","version":"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb","versionType":"git"},{"lessThan":"2090b05803faab8a9fa62fbff871007862cac1b7","status":"affected","version":"555dbf1a9aac6d3150c8b52fa35f768a692f4eeb","versionType":"git"},{"status":"affected","version":"f14816f2f928c560d28ba344af689f56efcd6f55","versionType":"git"},{"status":"affected","version":"3145fe0ebb16e1715ad541a301bc6675c8375fcd","versionType":"git"},{"lessThan":"5.11","status":"affected","version":"5.10.124","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.49","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/nfsd/vfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.17"},{"lessThan":"5.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.38","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.38","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.3","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.124","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.49","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reset write verifier on deferred writeback errors\n\nnfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to\ndetect deferred writeback errors, but neither rotates the server's write\nverifier (nn->writeverf) when this check fails. Every other\ndurable-storage-failure path in these functions calls\ncommit_reset_write_verifier() before returning an error.\n\nThe missing rotation means clients holding UNSTABLE write data under the\ncurrent verifier will COMMIT, receive the unchanged verifier back, and\nconclude their data is durable — silently dropping data that failed\nwriteback. This violates the UNSTABLE+COMMIT durability contract\n(RFC 1813 §3.3.7, RFC 8881 §18.32).\n\nAdd commit_reset_write_verifier() calls at both filemap_check_wb_err()\nerror sites, matching the pattern used by adjacent error paths in the\nsame functions. The helper already filters -EAGAIN and -ESTALE\ninternally, so the calls are unconditionally safe."}],"providerMetadata":{"dateUpdated":"2026-07-19T12:01:56.684Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e"},{"url":"https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f"},{"url":"https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd"},{"url":"https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7"}],"title":"nfsd: reset write verifier on deferred writeback errors","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53393","datePublished":"2026-07-19T12:01:56.684Z","dateReserved":"2026-06-09T07:44:35.402Z","dateUpdated":"2026-07-19T12:01:56.684Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 12:16:50","lastModifiedDate":"2026-07-19 12:16:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53393","Ordinal":"1","Title":"nfsd: reset write verifier on deferred writeback errors","CVE":"CVE-2026-53393","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53393","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: reset write verifier on deferred writeback errors\n\nnfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to\ndetect deferred writeback errors, but neither rotates the server's write\nverifier (nn->writeverf) when this check fails. Every other\ndurable-storage-failure path in these functions calls\ncommit_reset_write_verifier() before returning an error.\n\nThe missing rotation means clients holding UNSTABLE write data under the\ncurrent verifier will COMMIT, receive the unchanged verifier back, and\nconclude their data is durable — silently dropping data that failed\nwriteback. This violates the UNSTABLE+COMMIT durability contract\n(RFC 1813 §3.3.7, RFC 8881 §18.32).\n\nAdd commit_reset_write_verifier() calls at both filemap_check_wb_err()\nerror sites, matching the pattern used by adjacent error paths in the\nsame functions. The helper already filters -EAGAIN and -ESTALE\ninternally, so the calls are unconditionally safe.","Type":"Description","Title":"nfsd: reset write verifier on deferred writeback errors"}]}}}