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CVE-2026-89551: Linux

9.8

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 по мрежата, без особени условия, без вход и без действие от потребителя.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: xdr_buf_trim: clamp buf->len to avoid underflow xdr_buf_trim() trims `len` bytes from the tail of an xdr_buf by walking the tail, pages, and head iovecs. Each per-section step uses min_t() so it never removes more bytes than that section holds, but the final accounting at the fix_len label subtracts the total bytes actually consumed from buf->len without any clamp: fix_len: buf->len -= (len - trim); When the caller has set buf->len to a value smaller than the sum of the iov_lens, (len - trim) can exceed buf->len and the unsigned subtraction wraps to near UINT_MAX. gss_krb5_unwrap_v2() reaches xdr_buf_trim() in exactly that state: buf->head[0].iov_len -= GSS_KRB5_TOK_HDR_LEN + headskip; buf->len = len - (GSS_KRB5_TOK_HDR_LEN + headskip); xdr_buf_trim(buf, ec + GSS_KRB5_TOK_HDR_LEN + tailskip); buf->len is a small wire-derived value while the iov_lens are at page scale, so the per-section loops legitimately consume far more bytes than buf->len records. The wrapped buf->len then propagates as the authoritative stream bound into every downstream XDR decoder. Fix by clamping the decrement so buf->len bottoms out at zero: buf->len -= min_t(unsigned int, buf->len, len - trim); On the normal path where the iov_lens sum to buf->len, (len - trim) is always <= buf->len and the result is identical to before. No callers change behavior outside the underflow case.

Засегнати продукти

  • Linux Linux: 4c190e2f913f038c9c91ee63b59cd037260ba353 преди a3d77bcd974b8625d16bddf448cb3a1b5e37049c; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди fa16bbe987b47e771e52eeb1b4540f18d92496ac; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди a924ac4c78afab71bf82641afa3b62e0c4a8b55e; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди 4bf59cb0ea5b0ddfbc46a1dc2fa78fc8b9986ce4; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди e6267cccd7b05cc514e57f2160aa8db85f5c2701; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди ad0cce80d4af2f74674e8b635d97aa3880e83da8; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди 85e9602650e9df07190abe817cee3b4d9bc3df17; 4c190e2f913f038c9c91ee63b59cd037260ba353 преди 3f491306dcb673ff5e78e1044ba450c58978774e
  • Linux Linux: 3.9; преди 3.9; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

  • 11 септември 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-89551: Linux | freedomonline.bg