media: cx231xx: reject geometry changes while the VBI queue is busy
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
CVE-2026-89894
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89894
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "aa3314506deb9703bcf0e889db08959440228fbf",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "90d50648af36a1fbf5dbc99238de6fd0e58a13e0",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "a5dd3d7fba358ff9486f3f51b2a9038348c0970a",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "54ac6df8b8d97eddc3ae97fd2045bdedc8541b6d",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "1d1079db8d1807e259a1d2679ed314949797aad9",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "7087bef6510c7df5df0b19192633b8ecc0f33a6f",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "a636c72c7f522d984fa498fc0631f33a2d0be3fd",
"versionType": "git"
},
{
"status": "affected",
"version": "7c617138b8254a6bb60bfb5b8fc53eb8b3d6c3ab",
"lessThan": "627a121c15fe05a541f44d86016294b80bada75d",
"versionType": "git"
}
],
"programFiles": [
"drivers/media/usb/cx231xx/cx231xx-video.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/media/usb/cx231xx/cx231xx-video.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89894
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36343 · Revision 1
- Added to Heist Feed
- Publisher date