CVE-2026-64296 (GCVE-0-2026-64296)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-10-19 20:38
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: exfat: bound uniname advance in exfat_find_dir_entry() In exfat_find_dir_entry(), each TYPE_EXTEND (file name) entry advances the output pointer by a fixed amount while the loop guard only tracks the accumulated name length: if (++order == 2) uniname = p_uniname->name; else uniname += EXFAT_FILE_NAME_LEN; len = exfat_extract_uni_name(ep, entry_uniname); name_len += len; unichar = *(uniname+len); *(uniname+len) = 0x0; uniname grows by EXFAT_FILE_NAME_LEN (15) per name entry, but name_len grows only by the actual extracted length, which is shorter when a name fragment contains an early NUL. The only guard is `name_len >= MAX_NAME_LENGTH`, so a crafted directory with many short name fragments lets uniname run far past the p_uniname->name[MAX_NAME_LENGTH + 3] buffer while name_len stays small, causing an out-of-bounds read and write at *(uniname+len). The sibling extractor exfat_get_uniname_from_ext_entry() already stops on a short fragment (the lockstep `len != EXFAT_FILE_NAME_LEN` guard added in commit d42334578eba ("exfat: check if filename entries exceeds max filename length")); exfat_find_dir_entry() never got the equivalent. Track the per-entry write offset as a count and reject a fragment once the offset, or the offset plus the extracted length, would exceed MAX_NAME_LENGTH, before forming the output pointer.
References
Impacted products
Vendor Product Version
Linux Linux Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
Version: ca06197382bde0a3bc20215595d1c9ce20c6e341
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    "datePublished": "2026-07-25T08:49:33.847Z",
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    "dateUpdated": "2026-10-19T20:38:22.402Z",
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"72a2589d82eb001c94b74bcfe6f9a599bd9bef60\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"cf85180b8a015029ee147694eaf4e0b3537e9432\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"727bf7783a2936ffd55c628dddfd69343e511dcf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"33c0b96d7e1672be1de0053786637ea46fb81507\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"c8e041c68c0bbb73aa62371ee63947bb6949d8b2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ca06197382bde0a3bc20215595d1c9ce20c6e341\", \"lessThan\": \"3a1230e7b043c62737b05a3e9275ca83a43ad20a\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/exfat/dir.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/exfat/dir.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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-\u003ename;\\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 \u003e= MAX_NAME_LENGTH`, so a crafted directory with many short\\nname fragments lets uniname run far past the\\np_uniname-\u003ename[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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:52:53.790Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64296\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:22.402Z\", \"dateReserved\": \"2026-07-19T15:36:31.778Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:49:33.847Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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