{"api_version":"1","generated_at":"2026-08-13T11:11:48+00:00","cve":"CVE-2026-64296","urls":{"html":"https://cve.report/CVE-2026-64296","api":"https://cve.report/api/cve/CVE-2026-64296.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64296","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64296"},"summary":{"title":"exfat: bound uniname advance in exfat_find_dir_entry()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: bound uniname advance in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), each TYPE_EXTEND (file name) entry advances the\noutput pointer by a fixed amount while the loop guard only tracks the\naccumulated name length:\n\n\tif (++order == 2)\n\t\tuniname = p_uniname->name;\n\telse\n\t\tuniname += EXFAT_FILE_NAME_LEN;\n\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\tname_len += len;\n\tunichar = *(uniname+len);\n\t*(uniname+len) = 0x0;\n\nuniname grows by EXFAT_FILE_NAME_LEN (15) per name entry, but name_len\ngrows only by the actual extracted length, which is shorter when a name\nfragment contains an early NUL.  The only guard is\n`name_len >= MAX_NAME_LENGTH`, so a crafted directory with many short\nname fragments lets uniname run far past the\np_uniname->name[MAX_NAME_LENGTH + 3] buffer while name_len stays small,\ncausing an out-of-bounds read and write at *(uniname+len).\n\nThe sibling extractor exfat_get_uniname_from_ext_entry() already stops\non a short fragment (the lockstep `len != EXFAT_FILE_NAME_LEN` guard\nadded in commit d42334578eba (\"exfat: check if filename entries exceeds\nmax filename length\")); exfat_find_dir_entry() never got the\nequivalent.  Track the per-entry write offset as a count and reject a\nfragment once the offset, or the offset plus the extracted length, would\nexceed MAX_NAME_LENGTH, before forming the output pointer.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:10","updated_at":"2026-08-12 14:56:25"},"problem_types":["NVD-CWE-noinfo"],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4","name":"https://git.kernel.org/stable/c/fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a1230e7b043c62737b05a3e9275ca83a43ad20a","name":"https://git.kernel.org/stable/c/3a1230e7b043c62737b05a3e9275ca83a43ad20a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/727bf7783a2936ffd55c628dddfd69343e511dcf","name":"https://git.kernel.org/stable/c/727bf7783a2936ffd55c628dddfd69343e511dcf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33c0b96d7e1672be1de0053786637ea46fb81507","name":"https://git.kernel.org/stable/c/33c0b96d7e1672be1de0053786637ea46fb81507","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72a2589d82eb001c94b74bcfe6f9a599bd9bef60","name":"https://git.kernel.org/stable/c/72a2589d82eb001c94b74bcfe6f9a599bd9bef60","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0","name":"https://git.kernel.org/stable/c/ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cf85180b8a015029ee147694eaf4e0b3537e9432","name":"https://git.kernel.org/stable/c/cf85180b8a015029ee147694eaf4e0b3537e9432","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c8e041c68c0bbb73aa62371ee63947bb6949d8b2","name":"https://git.kernel.org/stable/c/c8e041c68c0bbb73aa62371ee63947bb6949d8b2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64296","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64296","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca06197382bde0a3bc20215595d1c9ce20c6e341 72a2589d82eb001c94b74bcfe6f9a599bd9bef60 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca06197382bde0a3bc20215595d1c9ce20c6e341 fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca06197382bde0a3bc20215595d1c9ce20c6e341 cf85180b8a015029ee147694eaf4e0b3537e9432 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ca06197382bde0a3bc20215595d1c9ce20c6e341 ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nexfat: bound uniname advance in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), each TYPE_EXTEND (file name) entry advances the\noutput pointer by a fixed amount while the loop guard only tracks the\naccumulated name length:\n\n\tif (++order == 2)\n\t\tuniname = p_uniname->name;\n\telse\n\t\tuniname += EXFAT_FILE_NAME_LEN;\n\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\tname_len += len;\n\tunichar = *(uniname+len);\n\t*(uniname+len) = 0x0;\n\nuniname grows by EXFAT_FILE_NAME_LEN (15) per name entry, but name_len\ngrows only by the actual extracted length, which is shorter when a name\nfragment contains an early NUL.  The only guard is\n`name_len >= MAX_NAME_LENGTH`, so a crafted directory with many short\nname fragments lets uniname run far past the\np_uniname->name[MAX_NAME_LENGTH + 3] buffer while name_len stays small,\ncausing an out-of-bounds read and write at *(uniname+len).\n\nThe sibling extractor exfat_get_uniname_from_ext_entry() already stops\non a short fragment (the lockstep `len != EXFAT_FILE_NAME_LEN` guard\nadded in commit d42334578eba (\"exfat: check if filename entries exceeds\nmax filename length\")); exfat_find_dir_entry() never got the\nequivalent.  Track the per-entry write offset as a count and reject a\nfragment once the offset, or the offset plus the extracted length, would\nexceed MAX_NAME_LENGTH, before forming the output pointer."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - A crafted exFAT image is reached through local pathname operations such as openat(), which call exfat_lookup(), exfat_find(), and exfat_find_dir_entry(); loop-backed images make physical access unnecessary.\nAC:L - The attacker controls the stream hash, declared name length, extension-entry sequence, and early NUL characters, making the out-of-bounds access deterministic without a race or uncontrollable condition.\nPR:L - Although exFAT cannot be mounted directly from a user namespace, common storage brokers allow an active unprivileged user to mount a loop-backed non-system image. Once mounted, triggering lookup requires only ordinary directory search access and no capability.\nUI:N - The unprivileged attacker can mount the crafted image through such a storage broker and issue the triggering pathname lookup without another user's action.\nS:U - The vulnerable filesystem parser and the affected kernel memory belong to the same security authority; ordinary kernel privilege escalation does not change scope.\nC:H - Crafted entries cause repeated out-of-bounds 16-bit reads across the kernel stack, and filename comparison behavior can provide an oracle over attacker-selected stack locations. Successful control-flow corruption could disclose arbitrary kernel memory.\nI:H - The function writes zero beyond the stack buffer, and the successful-match path can jump to found without restoring the overwritten value. Attacker-selected stack control data or pointers can therefore be corrupted, potentially enabling arbitrary writes or kernel code execution.\nA:H - Zero-length fragments can advance the pointer until it reaches a stack guard page or corrupts control data, causing an oops, panic, or persistent lockup."}]}],"providerMetadata":{"dateUpdated":"2026-08-05T12:40:40.483Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/72a2589d82eb001c94b74bcfe6f9a599bd9bef60"},{"url":"https://git.kernel.org/stable/c/fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4"},{"url":"https://git.kernel.org/stable/c/cf85180b8a015029ee147694eaf4e0b3537e9432"},{"url":"https://git.kernel.org/stable/c/ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0"},{"url":"https://git.kernel.org/stable/c/727bf7783a2936ffd55c628dddfd69343e511dcf"},{"url":"https://git.kernel.org/stable/c/33c0b96d7e1672be1de0053786637ea46fb81507"},{"url":"https://git.kernel.org/stable/c/c8e041c68c0bbb73aa62371ee63947bb6949d8b2"},{"url":"https://git.kernel.org/stable/c/3a1230e7b043c62737b05a3e9275ca83a43ad20a"}],"title":"exfat: bound uniname advance in exfat_find_dir_entry()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64296","datePublished":"2026-07-25T08:49:33.847Z","dateReserved":"2026-07-19T15:36:31.778Z","dateUpdated":"2026-08-05T12:40:40.483Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:10","lastModifiedDate":"2026-08-12 14:56:25","problem_types":["NVD-CWE-noinfo"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.261","matchCriteriaId":"F5BDA79D-4919-45F0-A4BC-DD6AAE3844CB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.212","matchCriteriaId":"8E99FB01-CD93-41AF-A653-3F450652B9A6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.178","matchCriteriaId":"092233C7-F4E0-40C8-BD4D-A28FE50DFE20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.145","matchCriteriaId":"7046B092-F810-4440-ACE6-60218518EECE"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.96","matchCriteriaId":"38A8100E-2B1A-462F-AEE9-8901B870FEF2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.39","matchCriteriaId":"914AE4BC-3D59-4C5A-9DB5-9CE327B429F7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.1.4","matchCriteriaId":"6228DDD6-4557-4AA3-9F43-AB995D471E42"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64296","Ordinal":"1","Title":"exfat: bound uniname advance in exfat_find_dir_entry()","CVE":"CVE-2026-64296","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64296","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nexfat: bound uniname advance in exfat_find_dir_entry()\n\nIn exfat_find_dir_entry(), each TYPE_EXTEND (file name) entry advances the\noutput pointer by a fixed amount while the loop guard only tracks the\naccumulated name length:\n\n\tif (++order == 2)\n\t\tuniname = p_uniname->name;\n\telse\n\t\tuniname += EXFAT_FILE_NAME_LEN;\n\tlen = exfat_extract_uni_name(ep, entry_uniname);\n\tname_len += len;\n\tunichar = *(uniname+len);\n\t*(uniname+len) = 0x0;\n\nuniname grows by EXFAT_FILE_NAME_LEN (15) per name entry, but name_len\ngrows only by the actual extracted length, which is shorter when a name\nfragment contains an early NUL.  The only guard is\n`name_len >= MAX_NAME_LENGTH`, so a crafted directory with many short\nname fragments lets uniname run far past the\np_uniname->name[MAX_NAME_LENGTH + 3] buffer while name_len stays small,\ncausing an out-of-bounds read and write at *(uniname+len).\n\nThe sibling extractor exfat_get_uniname_from_ext_entry() already stops\non a short fragment (the lockstep `len != EXFAT_FILE_NAME_LEN` guard\nadded in commit d42334578eba (\"exfat: check if filename entries exceeds\nmax filename length\")); exfat_find_dir_entry() never got the\nequivalent.  Track the per-entry write offset as a count and reject a\nfragment once the offset, or the offset plus the extracted length, would\nexceed MAX_NAME_LENGTH, before forming the output pointer.","Type":"Description","Title":"exfat: bound uniname advance in exfat_find_dir_entry()"}]}}}