{"id":"CVE-2026-98170","state":"PUBLISHED","title":"smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()\n\nIn move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is\ninsufficient. It allows iteration to continue even if the remaining\nsrc_size is too small to contain a complete smb2_ea_info structure.\nConsequently, reads of ea_name_length and ea_value_length can occur\nout-of-bounds.\n\nFix this by ensuring src_size >= sizeof(*src) before attempting to read\nany structure fields. Additionally, reject any next_entry_offset that is\nsmaller than sizeof(*src) or that would advance the pointer beyond the\navailable buffer.\n\nNote that for calls where the server returns a malformed EA list, the\nerror returned to userspace changes from -ENODATA (getxattr) or\n-ERANGE (listxattr) to -EIO. This correctly signals a server protocol\nerror rather than misleadingly indicating \"attribute not present\" or\n\"output buffer too small\".","publishedAt":"2026-10-06T08:44:15.138Z","updatedAt":"2026-10-30T12:37:48.952Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"22886b1b7464613373c9a7d0af2ace029c50cd97","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"9d707a278c100c26d10fbbbd03988778ffc992ce","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"90a13af4c9b1369327395bababfe87c75599cc19","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"61812323c037a94e2e7f0db7ee740c34b126bffe","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"d3546cecbf81d98bf3b472d341f981eb48c04f47","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"34a3942e787b9c59758115bd65fe1ec89d68c7a4","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c","fs/smb/client/trace.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","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/smb/client/smb2ops.c","fs/smb/client/trace.h"]}],"references":["https://git.kernel.org/stable/c/22886b1b7464613373c9a7d0af2ace029c50cd97","https://git.kernel.org/stable/c/9d707a278c100c26d10fbbbd03988778ffc992ce","https://git.kernel.org/stable/c/90a13af4c9b1369327395bababfe87c75599cc19","https://git.kernel.org/stable/c/61812323c037a94e2e7f0db7ee740c34b126bffe","https://git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47","https://git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4","https://git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca","https://git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb"],"weaknesses":[],"ingestedAt":"2026-10-30T12:56:04.490Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98170.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98170","state":"PUBLISHED","datePublished":"2026-10-06T08:44:15.138Z","dateUpdated":"2026-10-30T12:37:48.952Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.322Z"},"containers":{"cna":{"title":"smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()\n\nIn move_smb2_ea_to_cifs(), the while (src_size > 0) loop condition is\ninsufficient. It allows iteration to continue even if the remaining\nsrc_size is too small to contain a complete smb2_ea_info structure.\nConsequently, reads of ea_name_length and ea_value_length can occur\nout-of-bounds.\n\nFix this by ensuring src_size >= sizeof(*src) before attempting to read\nany structure fields. Additionally, reject any next_entry_offset that is\nsmaller than sizeof(*src) or that would advance the pointer beyond the\navailable buffer.\n\nNote that for calls where the server returns a malformed EA list, the\nerror returned to userspace changes from -ENODATA (getxattr) or\n-ERANGE (listxattr) to -EIO. This correctly signals a server protocol\nerror rather than misleadingly indicating \"attribute not present\" or\n\"output buffer too small\"."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"22886b1b7464613373c9a7d0af2ace029c50cd97","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"9d707a278c100c26d10fbbbd03988778ffc992ce","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"90a13af4c9b1369327395bababfe87c75599cc19","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"61812323c037a94e2e7f0db7ee740c34b126bffe","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"d3546cecbf81d98bf3b472d341f981eb48c04f47","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"34a3942e787b9c59758115bd65fe1ec89d68c7a4","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca","versionType":"git"},{"version":"95907fea4fd8ccc736e0a428e52159b4d42b9958","status":"affected","lessThan":"eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c","fs/smb/client/trace.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.14","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","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/smb/client/smb2ops.c","fs/smb/client/trace.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/22886b1b7464613373c9a7d0af2ace029c50cd97"},{"url":"https://git.kernel.org/stable/c/9d707a278c100c26d10fbbbd03988778ffc992ce"},{"url":"https://git.kernel.org/stable/c/90a13af4c9b1369327395bababfe87c75599cc19"},{"url":"https://git.kernel.org/stable/c/61812323c037a94e2e7f0db7ee740c34b126bffe"},{"url":"https://git.kernel.org/stable/c/d3546cecbf81d98bf3b472d341f981eb48c04f47"},{"url":"https://git.kernel.org/stable/c/34a3942e787b9c59758115bd65fe1ec89d68c7a4"},{"url":"https://git.kernel.org/stable/c/13efcd37a9b3d6ffa1579c3dda3e29c893ed9bca"},{"url":"https://git.kernel.org/stable/c/eeb5ef6083e1cefa2ef75041b5597ff228b8d7bb"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:37:48.952Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}