CVE-2026-64296 (GCVE-0-2026-64296)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59
VLAI
Title
exfat: bound uniname advance in exfat_find_dir_entry()
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 72a2589d82eb001c94b74bcfe6f9a599bd9bef60 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < cf85180b8a015029ee147694eaf4e0b3537e9432 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 727bf7783a2936ffd55c628dddfd69343e511dcf (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 33c0b96d7e1672be1de0053786637ea46fb81507 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < c8e041c68c0bbb73aa62371ee63947bb6949d8b2 (git)
Affected: ca06197382bde0a3bc20215595d1c9ce20c6e341 , < 3a1230e7b043c62737b05a3e9275ca83a43ad20a (git)
Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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        {
          "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."
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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/3a1230e7b043c62737b05a3e9275ca83a43ad20a"
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      ],
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      "title": "exfat: bound uniname advance in exfat_find_dir_entry()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64296.json",
      "version": "1"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/exfat/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/exfat/dir.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/33c0b96d7e1672be1de0053786637ea46fb81507\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3a1230e7b043c62737b05a3e9275ca83a43ad20a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/727bf7783a2936ffd55c628dddfd69343e511dcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/72a2589d82eb001c94b74bcfe6f9a599bd9bef60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8e041c68c0bbb73aa62371ee63947bb6949d8b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf85180b8a015029ee147694eaf4e0b3537e9432\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-27T07:21:57+00:00",
      "cve": "CVE-2026-64296",
      "id": "CVE-2026-64296",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: exfat: bound uniname advance in exfat_find_dir_entry()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64296.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:46:20Z",
      "cve": "CVE-2026-64296",
      "id": "CVE-2026-64296",
      "initial_release_date": "2026-07-25T16:46:20Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64296",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64296.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.