{"id":"CVE-2026-97610","state":"PUBLISHED","title":"netfs: Fix uninitialized return value in netfs_unbuffered_write()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix uninitialized return value in netfs_unbuffered_write()\n\nIf preparation of the first subrequest fails,\nnetfs_unbuffered_write() exits its loop before ret is initialized. The\nempty-iterator check can do the same.\n\nFor synchronous writes, netfs_unbuffered_write_iter_locked() may then\nreturn an unrelated error instead of wreq->error. This is reachable\nthrough CIFS if cifs_prepare_write() fails to reopen the file or obtain\ncredits.\n\nInitialize ret to 0 so the caller returns wreq->error if no data was\nwritten, or the number of bytes already written otherwise.\n\nFound with Clang's -Wconditional-uninitialized.","publishedAt":"2026-09-25T10:22:20.228Z","updatedAt":"2026-10-19T09:10:14.001Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"72d08d2839649d1c5efbe375751f4473fa4486af","status":"affected","lessThan":"3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26","versionType":"git"},{"version":"a0b4c7a49137ed21279f354eb59f49ddae8dffc2","status":"affected","lessThan":"2e38d500471d097cda87d7d374bbc1b13493075d","versionType":"git"},{"version":"a0b4c7a49137ed21279f354eb59f49ddae8dffc2","status":"affected","lessThan":"f18e8774f4d3137fa0a5fb8ffa83d59a719666d8","versionType":"git"},{"version":"0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0","status":"affected","versionType":"git"},{"version":"6.18.17","status":"affected","lessThan":"6.18.53","versionType":"semver"},{"version":"6.19.7","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/direct_write.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/direct_write.c"]}],"references":["https://git.kernel.org/stable/c/3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26","https://git.kernel.org/stable/c/2e38d500471d097cda87d7d374bbc1b13493075d","https://git.kernel.org/stable/c/f18e8774f4d3137fa0a5fb8ffa83d59a719666d8"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97610.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97610","state":"PUBLISHED","datePublished":"2026-09-25T10:22:20.228Z","dateUpdated":"2026-10-19T09:10:14.001Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-24T16:01:01.158Z"},"containers":{"cna":{"title":"netfs: Fix uninitialized return value in netfs_unbuffered_write()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix uninitialized return value in netfs_unbuffered_write()\n\nIf preparation of the first subrequest fails,\nnetfs_unbuffered_write() exits its loop before ret is initialized. The\nempty-iterator check can do the same.\n\nFor synchronous writes, netfs_unbuffered_write_iter_locked() may then\nreturn an unrelated error instead of wreq->error. This is reachable\nthrough CIFS if cifs_prepare_write() fails to reopen the file or obtain\ncredits.\n\nInitialize ret to 0 so the caller returns wreq->error if no data was\nwritten, or the number of bytes already written otherwise.\n\nFound with Clang's -Wconditional-uninitialized."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"72d08d2839649d1c5efbe375751f4473fa4486af","status":"affected","lessThan":"3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26","versionType":"git"},{"version":"a0b4c7a49137ed21279f354eb59f49ddae8dffc2","status":"affected","lessThan":"2e38d500471d097cda87d7d374bbc1b13493075d","versionType":"git"},{"version":"a0b4c7a49137ed21279f354eb59f49ddae8dffc2","status":"affected","lessThan":"f18e8774f4d3137fa0a5fb8ffa83d59a719666d8","versionType":"git"},{"version":"0c29f6d63122a0168d67cb8ecde5b4cf7fe4acb0","status":"affected","versionType":"git"},{"version":"6.18.17","status":"affected","lessThan":"6.18.53","versionType":"semver"},{"version":"6.19.7","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/direct_write.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/direct_write.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3d038eebdbd400c3bc4b66bd8aa0dff0c2bcce26"},{"url":"https://git.kernel.org/stable/c/2e38d500471d097cda87d7d374bbc1b13493075d"},{"url":"https://git.kernel.org/stable/c/f18e8774f4d3137fa0a5fb8ffa83d59a719666d8"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:10:14.001Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.17","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.7"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}