CVSS 7.8 · High EPSS 0,12%
Kerentanan Out-of-bounds Read pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut CNA.
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops When a BPF sock_ops program accesses ctx fields with dst_reg == src_reg, the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the destination register in the !fullsock / !locked_tcp_sock path. Both macros borrow a temporary register to check is_fullsock / is_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the ctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with a request_sock), dst_reg should be zeroed but is not, leaving the stale ctx pointer: - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer, leading to stack-out-of-bounds access in helpers like bpf_skc_to_tcp6_sock(). - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the verifier believes is a SCALAR_VALUE, leaking a kernel pointer. Fix both macros by: - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the added instruction. - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register restore in the !fullsock path, placed after the restore because dst_reg == src_reg means we need src_reg intact to read ctx->temp.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 5.4.61 hingga sebelum 5.5 |
| linux | linux kernel | Versi 5.7.18 hingga sebelum 5.8 |
| linux | linux kernel | Versi 5.8.4 hingga sebelum 5.9 |
| linux | linux kernel | Versi 5.9.1 hingga sebelum 7.0.10 |
| linux | linux kernel | Versi 5.9 |
| linux | linux kernel | Versi 5.9 rc2 |
| linux | linux kernel | Versi 5.9 rc3 |
| linux | linux kernel | Versi 5.9 rc4 |
| linux | linux kernel | Versi 5.9 rc5 |
| linux | linux kernel | Versi 5.9 rc6 |
| linux | linux kernel | Versi 5.9 rc7 |
| linux | linux kernel | Versi 5.9 rc8 |