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CVE-2026-31704 In the Linux kernel, the following vulnerability has been resolved: ksmbd: use check_add_overflow() to prevent u16…
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use check_add_overflow() to prevent u16 DACL size overflow set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate ACE sizes in u16 variables. When a file has many POSIX ACL entries, the accumulated size can wrap past 65535, causing the pointer arithmetic (char *)pndace + *size to land within already-written ACEs. Subsequent writes then overwrite earlier entries, and pndacl->size gets a truncated value. Use check_add_overflow() at each accumulation point to detect the wrap before it corrupts the buffer, consistent with existing check_mul_overflow() usage elsewhere in smbacl.c.
Produits et versions touchés
| Produit | Versions touchées | Corrigé en |
|---|---|---|
| Linux 7.1 | premières → < 7.1 | 7.1 |
| Linux 7.0 | premières → < 7.0.2 | 7.0.2 |
| Linux 6.18 | premières → < 6.18.25 | 6.18.25 |
| Linux 6.12 | premières → < 6.12.84 | 6.12.84 |
| Linux 6.6 | premières → < 6.6.136 | 6.6.136 |
| Linux 6.1 | premières → < 6.1.175 | 6.1.175 |
| Linux | 5.15 | Pas de correctif indiqué |
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | Versions non publiées |
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