{"api_version":"1","generated_at":"2026-05-18T05:15:49+00:00","cve":"CVE-2026-31438","urls":{"html":"https://cve.report/CVE-2026-31438","api":"https://cve.report/api/cve/CVE-2026-31438.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31438","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31438"},"summary":{"title":"netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators\n\nWhen a process crashes and the kernel writes a core dump to a 9P\nfilesystem, __kernel_write() creates an ITER_KVEC iterator. This\niterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which\nonly handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,\nhitting the BUG() for any other type.\n\nFix this by adding netfs_limit_kvec() following the same pattern as\nnetfs_limit_bvec(), since both kvec and bvec are simple segment arrays\nwith pointer and length fields. Dispatch it from netfs_limit_iter() when\nthe iterator type is ITER_KVEC.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-22 14:16:37","updated_at":"2026-04-23 16:17:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e","name":"https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e","name":"https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d","name":"https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14","name":"https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31438","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31438","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 18c2e20b42dd21db599e42d05ddaeeb647b2bb6d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 4bc2d72c7695cedf6d4e1a558924903c2b28a78e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 00d6df7115f6972370974212de9088087820802e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected cae932d3aee55035a54415dcea8e7ecf2ec469b5 67e467a11f62ff64ad219dc6aa5459e132c79d14 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.80 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31438","cve":"CVE-2026-31438","epss":"0.000180000","percentile":"0.046200000","score_date":"2026-04-26","updated_at":"2026-04-27 00:09:42"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/netfs/iterator.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"18c2e20b42dd21db599e42d05ddaeeb647b2bb6d","status":"affected","version":"cae932d3aee55035a54415dcea8e7ecf2ec469b5","versionType":"git"},{"lessThan":"4bc2d72c7695cedf6d4e1a558924903c2b28a78e","status":"affected","version":"cae932d3aee55035a54415dcea8e7ecf2ec469b5","versionType":"git"},{"lessThan":"00d6df7115f6972370974212de9088087820802e","status":"affected","version":"cae932d3aee55035a54415dcea8e7ecf2ec469b5","versionType":"git"},{"lessThan":"67e467a11f62ff64ad219dc6aa5459e132c79d14","status":"affected","version":"cae932d3aee55035a54415dcea8e7ecf2ec469b5","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/netfs/iterator.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.80","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators\n\nWhen a process crashes and the kernel writes a core dump to a 9P\nfilesystem, __kernel_write() creates an ITER_KVEC iterator. This\niterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which\nonly handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,\nhitting the BUG() for any other type.\n\nFix this by adding netfs_limit_kvec() following the same pattern as\nnetfs_limit_bvec(), since both kvec and bvec are simple segment arrays\nwith pointer and length fields. Dispatch it from netfs_limit_iter() when\nthe iterator type is ITER_KVEC."}],"providerMetadata":{"dateUpdated":"2026-04-22T13:53:37.053Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d"},{"url":"https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e"},{"url":"https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e"},{"url":"https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14"}],"title":"netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31438","datePublished":"2026-04-22T13:53:37.053Z","dateReserved":"2026-03-09T15:48:24.090Z","dateUpdated":"2026-04-22T13:53:37.053Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-22 14:16:37","lastModifiedDate":"2026-04-23 16:17:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31438","Ordinal":"1","Title":"netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterat","CVE":"CVE-2026-31438","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31438","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators\n\nWhen a process crashes and the kernel writes a core dump to a 9P\nfilesystem, __kernel_write() creates an ITER_KVEC iterator. This\niterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which\nonly handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,\nhitting the BUG() for any other type.\n\nFix this by adding netfs_limit_kvec() following the same pattern as\nnetfs_limit_bvec(), since both kvec and bvec are simple segment arrays\nwith pointer and length fields. Dispatch it from netfs_limit_iter() when\nthe iterator type is ITER_KVEC.","Type":"Description","Title":"netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterat"}]}}}