CVE-2026-63960: linux kernel

csirt@kutim:~/threat-intel/cve/CVE-2026-63960

CVSS 5.5 · Medium EPSS 0,16%

Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.

Deskripsi (NVD)

In the Linux kernel, the following vulnerability has been resolved: usb: typec: wcove: don't write past struct pd_message in wcove_read_rx_buffer() wcove_read_rx_buffer() copies the PD RX FIFO into the caller's struct pd_message with for (i = 0; i < USBC_RXINFO_RXBYTES(info); i++) regmap_read(wcove->regmap, USBC_RX_DATA + i, msg + i); which has two problems: USBC_RXINFO_RXBYTES() is a 5-bit field (max 31) while struct pd_message is 30 bytes (__le16 header + __le32 payload[PD_MAX_PAYLOAD], packed). The byte count latched in RXINFO is the number of bytes the port partner put on the wire, so a malicious partner that transmits a 31-byte frame can drive the loop one byte past the destination if the WCOVE BMC receiver does not enforce the PD object-count limit in hardware. The existing FIXME flagged this as unverified. Independently, regmap_read() takes an unsigned int * and stores a full unsigned int at the destination. Passing the byte pointer msg + i means each iteration writes four bytes; the high three are zero (val_bits is 8) and are normally overwritten by the next iteration, but the final iteration's high bytes are not. With RXBYTES == 30 the i == 29 iteration already writes three zero bytes past msg, which sits on the IRQ thread's stack in wcove_typec_irq(). Clamp the loop to sizeof(struct pd_message) and read each register into a local before storing only its low byte, so the copy can never exceed the destination regardless of what RXINFO reports.

Rincian

Terbit di NVD: 19 Juli 2026
Terakhir diubah: 30 Oktober 2026
Status NVD: Analyzed
CVSS 3.1: 5.5 (Medium), sumber NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator
EPSS (30 hari): 0,16% peluang dieksploitasi; lebih tinggi dari 4,7% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
linux	linux kernel	Versi 4.15 hingga sebelum 5.10.259
linux	linux kernel	Versi 5.11 hingga sebelum 5.15.210
linux	linux kernel	Versi 5.16 hingga sebelum 6.1.176
linux	linux kernel	Versi 6.2 hingga sebelum 6.6.143
linux	linux kernel	Versi 6.7 hingga sebelum 6.12.93
linux	linux kernel	Versi 6.13 hingga sebelum 6.18.35
linux	linux kernel	Versi 6.19 hingga sebelum 7.0.12
linux	linux kernel	Versi 7.1 rc1
linux	linux kernel	Versi 7.1 rc2
linux	linux kernel	Versi 7.1 rc3
linux	linux kernel	Versi 7.1 rc4
linux	linux kernel	Versi 7.1 rc5

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 31 Okt 2026, 06:25 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.