CVE-2026-31662

Katalog CVE

CVSS 7.5 · High EPSS 0,39%

Kerentanan Integer Underflow (Wrap or Wraparound) pada linux kernel. Skor CVSS 3.1 7.5 (High) menurut CNA.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG The GRP_ACK_MSG handler in tipc_group_proto_rcv() currently decrements bc_ackers on every inbound group ACK, even when the same member has already acknowledged the current broadcast round. Because bc_ackers is a u16, a duplicate ACK received after the last legitimate ACK wraps the counter to 65535. Once wrapped, tipc_group_bc_cong() keeps reporting congestion and later group broadcasts on the affected socket stay blocked until the group is recreated. Fix this by ignoring duplicate or stale ACKs before touching bc_acked or bc_ackers. This makes repeated GRP_ACK_MSG handling idempotent and prevents the underflow path.

Rincian

Terbit di NVD

24 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

7.5 (High), sumber CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-191: Integer Underflow (Wrap or Wraparound)

EPSS (30 hari)

0,39% peluang dieksploitasi; lebih tinggi dari 31,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://git.kernel.org/stable/c/1b6f13f626665cac67ba5a012765427680518711 patch
• https://git.kernel.org/stable/c/36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412 patch
• https://git.kernel.org/stable/c/3bcf7aca63f0bcd679ae28e9b99823c608e59ce3 patch
• https://git.kernel.org/stable/c/48a5fe38772b6f039522469ee6131a67838221a8 patch
• https://git.kernel.org/stable/c/575faea557f1a184a5f09661bd47ebd3ef3769f8 patch
• https://git.kernel.org/stable/c/a2ea1ef0167d7a84730638d05c20ccdc421b14b6 patch
• https://git.kernel.org/stable/c/a7db57ccca21f5801609065473c89a38229ecb92 patch
• https://git.kernel.org/stable/c/e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682 patch