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CVE-2026-64296: Linux, грешка в паметта

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

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.

Засегнати продукти

  • Linux Linux: ca06197382bde0a3bc20215595d1c9ce20c6e341 преди 72a2589d82eb001c94b74bcfe6f9a599bd9bef60; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди fae76a94b35ee8c0e2eb6f64caca01d75c6d34e4; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди cf85180b8a015029ee147694eaf4e0b3537e9432; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди ce4736c1e6c4cfbf1ac409a8c328a0b69546c9a0; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди 727bf7783a2936ffd55c628dddfd69343e511dcf; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди 33c0b96d7e1672be1de0053786637ea46fb81507; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди c8e041c68c0bbb73aa62371ee63947bb6949d8b2; ca06197382bde0a3bc20215595d1c9ce20c6e341 преди 3a1230e7b043c62737b05a3e9275ca83a43ad20a
  • Linux Linux: 5.7; преди 5.7; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.96 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 25 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-64296: Linux, грешка в паметта | freedomonline.bg