Към съдържанието
Търсене

CVE-2026-89894: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: media: cx231xx: reject geometry changes while the VBI queue is busy vidioc_s_fmt_vid_cap() and vidioc_s_std() change the device-wide dev->width / dev->norm but only refuse the change when the *video* queue (dev->vidq) is busy. The VBI queue (dev->vbiq) shares that same geometry: cx231xx_init_vbi_isoc() latches dma_q->lines_per_field from dev->norm, the VBI videobuf2 plane is sized from dev->width / dev->norm in vbi_queue_setup() and vbi_buf_prepare(), and cx231xx_do_vbi_copy() then recomputes the destination offset from the *live* dev->width and the latched lines_per_field on every URB completion: offset = lines_completed * (dev->width << 1) + ...; if (dma_q->current_field == 2) offset += dev->width * 2 * dma_q->lines_per_field; memcpy(plane + offset, p_buffer, lencopy); Because the VBI node shares video_ioctl_ops with the video node, an application can size a small VBI plane (REQBUFS/QBUF with a small width, or with the NTSC standard), then enlarge dev->width (or switch dev->norm to PAL) through the video node while the VBI stream is running -- the change is allowed because only dev->vidq is checked -- and let the device deliver a field-2 VBI payload. cx231xx_do_vbi_copy() now computes the offset with the larger geometry and memcpy()s past the end of the smaller plane that was already allocated, a heap out-of-bounds write whose offset is attacker-chosen and whose contents come from the device. The per-field guard in cx231xx_copy_vbi_line() does not help: it bounds the copy against the latched lines_per_field, not the plane's real capacity, and vb2 does not re-run buf_prepare() for an already prepared buffer. Refuse the format/standard change when the VBI queue is busy as well, so the geometry cannot change underneath an allocated VBI buffer.

    Засегнати продукти

    • Linux Linux: 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди aa3314506deb9703bcf0e889db08959440228fbf; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди 90d50648af36a1fbf5dbc99238de6fd0e58a13e0; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди a5dd3d7fba358ff9486f3f51b2a9038348c0970a; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди 54ac6df8b8d97eddc3ae97fd2045bdedc8541b6d; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди 1d1079db8d1807e259a1d2679ed314949797aad9; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди 7087bef6510c7df5df0b19192633b8ecc0f33a6f; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди a636c72c7f522d984fa498fc0631f33a2d0be3fd; 7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab преди 627a121c15fe05a541f44d86016294b80bada75d
    • Linux Linux: 5.5; преди 5.5; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.51 до 6.18.*; 7.2.5 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89894: Linux | freedomonline.bg