CVE-2026-93125
Açıklama (NVD)
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max check_kfunc_args() detects a kfunc argument named rdonly_buf_size or rdwr_buf_size and stores reg->var_off.value into meta->r0_size, a u64, and does not bound it. check_kfunc_call() later copies that value into the returned register's mem_size field: meta->r0_size = reg->var_off.value; ... regs[BPF_REG_0].mem_size = meta.r0_size; regs[BPF_REG_0].mem_size is u32. A constant whose upper 32 bits are set gets truncated instead of causing a load-time rejection, so the verifier records a PTR_TO_MEM register with an approximately 4 GiB mem_size for whatever allocation the kfunc returned. A later access check against that register uses the truncated, wrong bound. Reject rdonly_buf_size/rdwr_buf_size values that exceed U32_MAX at the point meta->r0_size is set.
Yayın: 17.09.2026 · Son değişiklik: 30.10.2026
CVSS 3.1 metrikleri
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Saldırı vektörü | Yerel |
| Karmaşıklık | Düşük |
| Gereken yetki | Düşük |
| Kullanıcı etkileşimi | Gerekmez |
| Kapsam | Değişmez |
| Gizlilik | Yüksek |
| Bütünlük | Yüksek |
| Erişilebilirlik | Yüksek |
Hesaplanan temel puan: 7.8. CVSS hesaplayıcıda incele
Referanslar
- https://git.kernel.org/stable/c/00bb52be60da16cd5ead4eb9f8ddc9a66d003ff2
- https://git.kernel.org/stable/c/2147065d3a4e1d5d42ae553fef165f17ec5e0e79
- https://git.kernel.org/stable/c/2aaf67f0516fde29620d0edfc29c01b9ea7ad430
- https://git.kernel.org/stable/c/56a3846830ac95a472297d0cbba75cbff29540bb
- https://git.kernel.org/stable/c/93a20b14f8627b2d3486e3ec1d3f2e7275a506ec
- https://git.kernel.org/stable/c/b6ac0b5732047d43172b9dfbe6b57b9b8de303c2