{"id":"CVE-2026-89683","state":"PUBLISHED","title":"nfsd: fix dentry ref leak on V4ROOT export filehandle lookup","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp->fh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export's fsid\ntriggers the leak on every request.","publishedAt":"2026-09-11T19:46:05.635Z","updatedAt":"2026-10-19T08:50:56.607Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"d493cf57f4c4dae5396cd6ad41e5c209d0615a81","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"c1ae0f973bcba5730871e35976a0ab6878fdac34","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfsfh.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/nfsd/nfsfh.c"]}],"references":["https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81","https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34","https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca","https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89683.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89683","state":"PUBLISHED","datePublished":"2026-09-11T19:46:05.635Z","dateUpdated":"2026-10-19T08:50:56.607Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.748Z"},"containers":{"cna":{"title":"nfsd: fix dentry ref leak on V4ROOT export filehandle lookup","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix dentry ref leak on V4ROOT export filehandle lookup\n\nnfsd_set_fh_dentry() leaks the dentry reference from\nexportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE\nswitch cases detect NFSEXP_V4ROOT and goto out. The out: label\ncalls exp_put() but never dput(dentry), and fhp->fh_dentry was\nnever assigned so fh_put() cannot compensate.\n\nA crafted NFSv3 filehandle targeting a V4ROOT export's fsid\ntriggers the leak on every request."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"d493cf57f4c4dae5396cd6ad41e5c209d0615a81","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"c1ae0f973bcba5730871e35976a0ab6878fdac34","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca","versionType":"git"},{"version":"ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444","status":"affected","lessThan":"6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nfsd/nfsfh.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/nfsd/nfsfh.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81"},{"url":"https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34"},{"url":"https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca"},{"url":"https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:50:56.607Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}