CVE-2026-89882

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89882", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.772Z", "datePublished": "2026-09-16T10:31:47.644Z", "dateUpdated": "2026-10-19T08:54:15.482Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:15.482Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow\n\nst_ref_pic_set_prediction() computes the reference RPS index as\nst_rps_idx - (delta_idx_minus1 + 1) per HEVC spec equation 7-59.\nBoth operands are u8, so when delta_idx_minus1 + 1 exceeds the\ncurrent index the subtraction wraps and the subsequent array access\nat calculated_rps_st_sets[ref_rps_idx] reads far out of bounds.\n\nA userspace V4L2 client that can open the RKVDEC m2m decoder can\nsubmit an EXT_SPS_ST_RPS control with INTER_REF_PIC_SET_PRED set\nand delta_idx_minus1 crafted to trigger the underflow.\n\nReject the entry early when the reference index would underflow."}], "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 EXT_SPS_ST_RPS control is applied only via VIDIOC_S_EXT_CTRLS or a media request on the local rkvdec V4L2 m2m node (/dev/videoN), then consumed in rkvdec_hevc_run after QBUF/STREAMON. The HEVC RPS parser is not reachable from the network stack.\nAC:L - The attacker sets INTER_REF_PIC_SET_PRED and a delta_idx_minus1 that makes the u8 index wrap (e.g. idx=0 and delta_idx_minus1=0 yields ref_rps_idx=255). v4l2-ctrls never validates delta_idx_minus1 and try_ctrl only checks SPS, so the out-of-bounds access is deterministic with no race.\nPR:L - rkvdec_open and the ioctl path perform no capability check. An unprivileged local account that can open the decoder node is sufficient, typically via the video group or the Android/embedded media codec service that sandboxed apps can reach.\nUI:N - The attacking process itself opens the decoder, attaches a crafted EXT_SPS_ST_RPS control, queues buffers, and starts streaming. No separate victim action is required.\nS:U - The underflow corrupts kernel heap, stack, and the driver's DMA RPS table inside the same kernel security authority. This is local privilege escalation, not a VM escape, IOMMU bypass, or sandbox-boundary crossing.\nC:H - A wrapped u8 ref_rps_idx indexes calculated_rps_st_sets tens of kilobytes past the kzalloc allocation (up to 255 * sizeof(struct calculated_rps_st_set)). Those out-of-bounds bytes become loop bounds and are copied into the hardware RPS table, giving an attacker-steerable kernel memory read.\nI:H - Out-of-bounds num_delta_pocs overflows the 16-byte stack arrays use_delta_flag and used_by_curr_pic_flag, later loops write past st_rps->delta_poc_s0[16] on the heap, and assemble_hw_st_rps bit-writes rps->info with an unbounded index. That is an attacker-influenced kernel write usable for control-flow hijack.\nA:H - The far out-of-bounds pointer, stack smash, and DMA RPS-table overrun each cause a kernel oops, KASAN report, or wedged decoder, and the attacker can repeat the sequence 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/platform/rockchip/rkvdec/rkvdec-hevc-common.c"], "versions": [{"version": "c9a59dc2acc72789d5c778af080d1e65af84862c", "lessThan": "74938f83a8abbee8f502dfb5d94213b2497d1edf", "status": "affected", "versionType": "git"}, {"version": "c9a59dc2acc72789d5c778af080d1e65af84862c", "lessThan": "052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3", "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/platform/rockchip/rkvdec/rkvdec-hevc-common.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "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": "7.0", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/74938f83a8abbee8f502dfb5d94213b2497d1edf"}, {"url": "https://git.kernel.org/stable/c/052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3"}], "title": "media: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/media/platform/rockchip/rkvdec/rkvdec-hevc-common.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "74938f83a8abbee8f502dfb5d94213b2497d1edf", "status": "affected", "version": "c9a59dc2acc72789d5c778af080d1e65af84862c", "versionType": "git"}, {"lessThan": "052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3", "status": "affected", "version": "c9a59dc2acc72789d5c778af080d1e65af84862c", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/media/platform/rockchip/rkvdec/rkvdec-hevc-common.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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rkvdec: hevc: guard INTER_REF_PIC_SET_PRED index underflow\n\nst_ref_pic_set_prediction() computes the reference RPS index as\nst_rps_idx - (delta_idx_minus1 + 1) per HEVC spec equation 7-59.\nBoth operands are u8, so when delta_idx_minus1 + 1 exceeds the\ncurrent index the subtraction wraps and the subsequent array access\nat calculated_rps_st_sets[ref_rps_idx] reads far out of bounds.\n\nA userspace V4L2 client that can open the RKVDEC m2m decoder can\nsubmit an EXT_SPS_ST_RPS control with INTER_REF_PIC_SET_PRED set\nand delta_idx_minus1 crafted to trigger the underflow.\n\nReject the entry early when the reference index would underflow."}], "id": "CVE-2026-89882", "lastModified": "2026-10-19T09:18:33.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:56.647", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74938f83a8abbee8f502dfb5d94213b2497d1edf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c9a59dc2acc72789d5c778af080d1e65af84862c,74938f83a8abbee8f502dfb5d94213b2497d1edf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c9a59dc2acc72789d5c778af080d1e65af84862c,052c5ed5a1d96a6b24fd50ccda16fc6841ee7ca3)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-16T21:00:07.239931+00:00", "updated": "2026-09-18T08:30:06.688160+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}