CVE-2026-89873 (GCVE-0-2026-89873)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-ctrls: validate HEVC EXT SPS RPS counts The HEVC SPS control carries the short-term and long-term RPS counts that decoder drivers use to walk the matching EXT SPS dynamic arrays. Reject SPS values that exceed the HEVC limits of 64 short-term sets and 32 long-term references so drivers cannot later index beyond those controls. Also reject EXT SPS ST RPS entries whose negative or positive picture counts exceed the 16-entry arrays, or whose combined delta-POC count exceeds the HEVC DPB maximum.
References
Impacted products
Vendor Product Version
Linux Linux Version: c9a59dc2acc72789d5c778af080d1e65af84862c
Version: c9a59dc2acc72789d5c778af080d1e65af84862c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/v4l2-core/v4l2-ctrls-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "30f85a7c59113a8844b276efc010085a34f912e9",
              "status": "affected",
              "version": "c9a59dc2acc72789d5c778af080d1e65af84862c",
              "versionType": "git"
            },
            {
              "lessThan": "796b5c6d4f1615d59d5d8fe5a38fae6bfdfe878e",
              "status": "affected",
              "version": "c9a59dc2acc72789d5c778af080d1e65af84862c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/v4l2-core/v4l2-ctrls-core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC EXT SPS RPS counts\n\nThe HEVC SPS control carries the short-term and long-term RPS counts\nthat decoder drivers use to walk the matching EXT SPS dynamic arrays.\nReject SPS values that exceed the HEVC limits of 64 short-term sets and\n32 long-term references so drivers cannot later index beyond those\ncontrols.\n\nAlso reject EXT SPS ST RPS entries whose negative or positive picture\ncounts exceed the 16-entry arrays, or whose combined delta-POC count\nexceeds the HEVC DPB maximum."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through the local V4L2 interface on a stateless HEVC decoder node (/dev/videoN) via VIDIOC_S_EXT_CTRLS plus request-API QBUF/STREAMON. There is no remote or network-facing path into the HEVC SPS or EXT SPS RPS controls.\nAC:L - The attacker supplies num_short_term_ref_pic_sets, num_long_term_ref_pics_sps, num_negative_pics, and num_positive_pics as unconstrained u8 values; any out-of-range count deterministically drives rkvdec HEVC RPS assembly out of bounds on the next decode run. No race, timing window, or uncontrollable memory layout is involved.\nPR:L - Only an unprivileged local account with access to the video device node is required (typically the video group, or the media/codec service on Android and embedded Rockchip devices). rkvdec_open() and rkvdec_hevc_validate_sps() check neither capabilities nor the RPS counts.\nUI:N - The attacking process performs the entire sequence itself: open the decoder, set the crafted HEVC SPS and EXT SPS RPS controls, queue buffers, and start streaming. No victim action, media file, or mount is needed.\nS:U - The out-of-bounds accesses stay inside the kernel\u0027s own slab and coherent DMA memory within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - rkvdec_hevc_prepare_hw_st_rps() indexes ext_sps_st_rps[] with an attacker-chosen u8 count up to 255 against a 64-entry (or smaller dynamic) array, and st_ref_pic_set_calculate() reads delta_poc_s0_minus1[] past its 16-entry field, leaking adjacent kernel heap into the decode path.\nI:H - st_ref_pic_set_calculate() writes used_by_curr_pic_s0[]/delta_poc_s0[] with a u8 loop bound up to 255 into 16-entry arrays on a kzalloc object, and rkvdec_set_bw_field() writes RPS bitfields for set index i\u003e63 past the end of the rps DMA object into adjacent priv_tbl memory.\nA:H - The heap overflow of calculated_rps_st_sets and the DMA-table bitfield writes can walk into unmapped or poisoned memory and trip KASAN/hardening checks, producing a kernel oops, and can wedge the decoder hardware; the trigger is repeatable at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:06.310Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30f85a7c59113a8844b276efc010085a34f912e9"
        },
        {
          "url": "https://git.kernel.org/stable/c/796b5c6d4f1615d59d5d8fe5a38fae6bfdfe878e"
        }
      ],
      "title": "media: v4l2-ctrls: validate HEVC EXT SPS RPS counts",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89873",
    "datePublished": "2026-09-16T10:31:41.341Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-10-19T08:54:06.310Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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