{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97575", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.156Z", "datePublished": "2026-09-25T10:21:58.700Z", "dateUpdated": "2026-10-19T09:09:37.843Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:09:37.843Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate AV1 tile counts\n\nThe stateless AV1 decoders use tile_info.tile_cols and tile_rows as loop\nbounds and as indices into the mi_*_starts[] and *_in_sbs_minus_1[]\narrays, as the divisor for context_update_tile_id, and their product\nbounds the per-tile descriptor buffers, but std_validate_compound() does\nnot bound these u8 fields. Reject a V4L2_CTRL_TYPE_AV1_FRAME whose\ntile_cols or tile_rows exceeds V4L2_AV1_MAX_TILE_COLS / _ROWS, or whose\nproduct exceeds V4L2_AV1_MAX_TILE_COUNT. A zero tile count is left to the\nconsuming driver so the zero-initialised control that existing userspace\nsubmits is still accepted." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The attacker-controlled tile_info.tile_cols/tile_rows u8s enter the kernel in V4L2_CID_STATELESS_AV1_FRAME via VIDIOC_S_EXT_CTRLS (or the request-fd path through try_set_ext_ctrls_request) on a local /dev/videoN AV1 decoder; validate_av1_frame() in std_validate_compound() is that ioctl's check. No network protocol carries those fields.\nAC:L - The attacker sets tile_cols and tile_rows to any u8 (e.g. 255) in that AV1_FRAME control and queues STREAMON/MEDIA_REQUEST_IOC_QUEUE; vdec_av1_slice_setup_tile() and rockchip_vpu981_av1_dec_set_tile_info() then loop and index on those values deterministically, with no race or victim-side state.\nPR:L - hantro_open() and fops_vcodec_open() have no capable() check; v4l2_prio_check() only compares V4L2 file-handle priority among openers. An unprivileged local user who can open the decoder node (video group, udev uaccess, or Android media-codec UID) is sufficient.\nUI:N - The attacking process itself opens the stateless AV1 decoder, submits the crafted AV1_FRAME control, queues buffers, and starts streaming. No victim action such as mounting media or opening a file is required.\nS:U - The overflows stay inside the kernel's kzalloc'd vdec_av1_slice_pfc (lat_buf->private_data) and the hantro tile_info coherent DMA buffer in the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - rockchip_vpu981_av1_dec_set_tile_info() reads group_entry[tile1*tile_cols+tile0] with a product up to 255*255 past the V4L2_AV1_MAX_TILE_COUNT TILE_GROUP_ENTRY array, and indexes height_in_sbs_minus_1[tile1] past its 64-entry field, pulling adjacent kernel heap into the decode path.\nI:H - vdec_av1_slice_setup_tile() writes tile_cols+1 entries into mi_col_starts[V4L2_AV1_MAX_TILE_COLS+1] on the kzalloc'd pfc before the later product check; rockchip_vpu981_av1_dec_set_tile_info() writes 16 bytes per tile into a 128-slot (AV1_TILE_INFO_SIZE) DMA buffer for up to 255*255 tiles, an attacker-controlled kernel write.\nA:H - Those heap and DMA-buffer overruns walk into unmapped or poisoned memory and produce a kernel oops or KASAN report, and the attacker can repeat the AV1_FRAME request at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/v4l2-core/v4l2-ctrls-core.c" ], "versions": [ { "version": "9de30f579980b498606a9c2440b73ae3b670771b", "lessThan": "1afaf85c4990fb1e3168d0d6e99246a65e526f1b", "status": "affected", "versionType": "git" }, { "version": "9de30f579980b498606a9c2440b73ae3b670771b", "lessThan": "85df9fc79b07f1cc7c953f930ae7e675d0c1e820", "status": "affected", "versionType": "git" }, { "version": "9de30f579980b498606a9c2440b73ae3b670771b", "lessThan": "c8891da0186fe4c04bccbbd7d84b01a3c941ac7a", "status": "affected", "versionType": "git" }, { "version": "9de30f579980b498606a9c2440b73ae3b670771b", "lessThan": "c4c88b5ba85685043d171e0e9c9d00a8cf6a89e8", "status": "affected", "versionType": "git" }, { "version": "9de30f579980b498606a9c2440b73ae3b670771b", "lessThan": "439058ced617fbb3febc017b9e93bb7387f309e0", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/v4l2-core/v4l2-ctrls-core.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1afaf85c4990fb1e3168d0d6e99246a65e526f1b" }, { "url": "https://git.kernel.org/stable/c/85df9fc79b07f1cc7c953f930ae7e675d0c1e820" }, { "url": "https://git.kernel.org/stable/c/c8891da0186fe4c04bccbbd7d84b01a3c941ac7a" }, { "url": "https://git.kernel.org/stable/c/c4c88b5ba85685043d171e0e9c9d00a8cf6a89e8" }, { "url": "https://git.kernel.org/stable/c/439058ced617fbb3febc017b9e93bb7387f309e0" } ], "title": "media: v4l2-ctrls: validate AV1 tile counts", "x_generator": { "engine": "bippy-1.2.0" } } } }