CVE-2026-89818

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89818", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.768Z", "datePublished": "2026-09-16T10:30:50.946Z", "dateUpdated": "2026-10-19T08:53:12.347Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:53:12.347Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting\nthe parser loop far past the end of the message BO. Triggering it\nadditionally requires a ~4GiB mapping so that msg[1] survives the\nearlier \"header does not fit in BO\" check.\n\nRewrite the test in division form, which is overflow-free by\nconstruction. Also update the message to reflect that msg is invalid."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via the local DRM_IOCTL_AMDGPU_CS ioctl on /dev/dri/renderD* (amdgpu_cs_ioctl \u2192 amdgpu_cs_patch_jobs \u2192 amdgpu_cs_patch_ibs \u2192 vcn_v3/v4_0_ring_patch_cs_in_place \u2192 vcn_*_dec_msg). There is no network or physical path to the VCN decode-message parser.\nAC:L - The attacker fully controls the decode-message GEM BO. Setting num_buffers to 0x3FFFFFFF with a ~4GiB mapping makes 6+num_buffers*4 wrap to 2 so the uint32 bounds check passes deterministically; allocating that mapping is attacker-controlled on typical GPU workstations and cloud GPU hosts.\nPR:L - AMDGPU_CS is registered with DRM_AUTH|DRM_RENDER_ALLOW, so any unprivileged local user who can open the AMDGPU render node (typical render/video group on desktops, handhelds, Android, and GPU cloud instances) can submit VCN command buffers without root.\nUI:N - The attacker submits the crafted VCN command buffer through their own DRM context; no separate victim action such as opening a file or mounting a filesystem is required.\nS:U - The out-of-bounds read is performed by the CPU in the kernel kmap of the message BO and stays within the kernel security authority; it is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - Bypassing the buffer-count check lets the parser loop about 0x3FFFFFFF times, each step reading 16 bytes past the kmapped BO, an unbounded kernel out-of-bounds read well beyond a few bytes.\nI:N - The loop only reads message dwords and, when a CREATE record is seen, still bounds-checks offset/size against the BO before any further access; no out-of-bounds write or control-flow hijack primitive is produced.\nA:H - The unbounded walk past the kmapped BO into unmapped kernel or MMIO address space causes a page fault/oops, and the billion-iteration loop can also soft-lock the CS path before faulting."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c", "drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c"], "versions": [{"version": "88411caee8f576d6b5abf6531232fcc0ce756dc5", "lessThan": "c2340281be4ddacb8c203e2bce59b126d1d6c4c8", "status": "affected", "versionType": "git"}, {"version": "c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e", "lessThan": "6dceaeceaa7c8396339f3ea34b0110cb912ca61b", "status": "affected", "versionType": "git"}, {"version": "7688143ca62edeecacb3ba0a2cea129dbd262a18", "lessThan": "47799e1f893d47d8af231710a61065e3ec8a13e8", "status": "affected", "versionType": "git"}, {"version": "63b51e8a9d54317d31cc3856c1e12407070d5fc2", "lessThan": "7e28853c78c20bb8ba4c1dba702430cd05e09f76", "status": "affected", "versionType": "git"}, {"version": "b193019860d61e92da395eae2011f2f6716b182f", "lessThan": "9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3", "status": "affected", "versionType": "git"}, {"version": "b193019860d61e92da395eae2011f2f6716b182f", "lessThan": "4d7390530853eb7befda9cc786e4c86e8ad7ac9e", "status": "affected", "versionType": "git"}, {"version": "f55552adb100eb54a6e6dabff4fbdc8679bd3fa0", "status": "affected", "versionType": "git"}, {"version": "82c535eff05490c71153af57de9fe85502fcb5d5", "status": "affected", "versionType": "git"}, {"version": "638d3e0b9eb77aa53fdd60e2b928761d16ba76fa", "status": "affected", "versionType": "git"}, {"version": "870c8738c3774336baedddd0240951d078a703b8", "status": "affected", "versionType": "git"}, {"version": "638e48ee39d0f2af9336f917a6f5d6692dd64d93", "status": "affected", "versionType": "git"}, {"version": "e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7", "status": "affected", "versionType": "git"}, {"version": "3c817a60b09eaab926e475088e750936efcc95ae", "status": "affected", "versionType": "git"}, {"version": "6.1.175", "lessThan": "6.1.188", "status": "affected", "versionType": "semver"}, {"version": "6.6.140", "lessThan": "6.6.157", "status": "affected", "versionType": "semver"}, {"version": "6.12.90", "lessThan": "6.12.110", "status": "affected", "versionType": "semver"}, {"version": "6.18.32", "lessThan": "6.18.51", "status": "affected", "versionType": "semver"}, {"version": "5.15.209", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "7.0.9", "lessThan": "7.1", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c", "drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.51", "lessThanOrEqual": "6.18.*", "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": "6.1.175", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.140", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.90", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.32", "versionEndExcluding": "6.18.51"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8"}, {"url": "https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b"}, {"url": "https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8"}, {"url": "https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76"}, {"url": "https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3"}, {"url": "https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e"}], "title": "drm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c", "drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c2340281be4ddacb8c203e2bce59b126d1d6c4c8", "status": "affected", "version": "88411caee8f576d6b5abf6531232fcc0ce756dc5", "versionType": "git"}, {"lessThan": "6dceaeceaa7c8396339f3ea34b0110cb912ca61b", "status": "affected", "version": "c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e", "versionType": "git"}, {"lessThan": "47799e1f893d47d8af231710a61065e3ec8a13e8", "status": "affected", "version": "7688143ca62edeecacb3ba0a2cea129dbd262a18", "versionType": "git"}, {"lessThan": "7e28853c78c20bb8ba4c1dba702430cd05e09f76", "status": "affected", "version": "63b51e8a9d54317d31cc3856c1e12407070d5fc2", "versionType": "git"}, {"lessThan": "9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3", "status": "affected", "version": "b193019860d61e92da395eae2011f2f6716b182f", "versionType": "git"}, {"lessThan": "4d7390530853eb7befda9cc786e4c86e8ad7ac9e", "status": "affected", "version": "b193019860d61e92da395eae2011f2f6716b182f", "versionType": "git"}, {"status": "affected", "version": "f55552adb100eb54a6e6dabff4fbdc8679bd3fa0", "versionType": "git"}, {"status": "affected", "version": "82c535eff05490c71153af57de9fe85502fcb5d5", "versionType": "git"}, {"status": "affected", "version": "638d3e0b9eb77aa53fdd60e2b928761d16ba76fa", "versionType": "git"}, {"status": "affected", "version": "870c8738c3774336baedddd0240951d078a703b8", "versionType": "git"}, {"status": "affected", "version": "638e48ee39d0f2af9336f917a6f5d6692dd64d93", "versionType": "git"}, {"status": "affected", "version": "e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7", "versionType": "git"}, {"status": "affected", "version": "3c817a60b09eaab926e475088e750936efcc95ae", "versionType": "git"}, {"lessThan": "6.1.188", "status": "affected", "version": "6.1.175", "versionType": "semver"}, {"lessThan": "6.6.157", "status": "affected", "version": "6.6.140", "versionType": "semver"}, {"lessThan": "6.12.110", "status": "affected", "version": "6.12.90", "versionType": "semver"}, {"lessThan": "6.18.51", "status": "affected", "version": "6.18.32", "versionType": "semver"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.209", "versionType": "semver"}, {"lessThan": "7.1", "status": "affected", "version": "7.0.9", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c", "drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "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\ndrm/amdgpu/vcn: fix integer overflow in dec_msg buffer count check\n\nIf the supplied msg[2] (num_buffers) is 0x3FFFFFFF, the expression\n6 + num_buffers * 4 wraps to 2 and the bounds check passes, letting\nthe parser loop far past the end of the message BO. Triggering it\nadditionally requires a ~4GiB mapping so that msg[1] survives the\nearlier \"header does not fit in BO\" check.\n\nRewrite the test in division form, which is overflow-free by\nconstruction. Also update the message to reflect that msg is invalid."}], "id": "CVE-2026-89818", "lastModified": "2026-10-19T09:18:25.673", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:47.113", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47799e1f893d47d8af231710a61065e3ec8a13e8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4d7390530853eb7befda9cc786e4c86e8ad7ac9e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6dceaeceaa7c8396339f3ea34b0110cb912ca61b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e28853c78c20bb8ba4c1dba702430cd05e09f76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c2340281be4ddacb8c203e2bce59b126d1d6c4c8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[88411caee8f576d6b5abf6531232fcc0ce756dc5,c2340281be4ddacb8c203e2bce59b126d1d6c4c8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c72a8b4dc6d598e3831ef3abd9c6527dfbf4810e,6dceaeceaa7c8396339f3ea34b0110cb912ca61b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[7688143ca62edeecacb3ba0a2cea129dbd262a18,47799e1f893d47d8af231710a61065e3ec8a13e8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63b51e8a9d54317d31cc3856c1e12407070d5fc2,7e28853c78c20bb8ba4c1dba702430cd05e09f76)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b193019860d61e92da395eae2011f2f6716b182f,9ae19bd60891bea0a7b7504cc8dbfe74570ac3b3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b193019860d61e92da395eae2011f2f6716b182f,4d7390530853eb7befda9cc786e4c86e8ad7ac9e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f55552adb100eb54a6e6dabff4fbdc8679bd3fa0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "82c535eff05490c71153af57de9fe85502fcb5d5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "638d3e0b9eb77aa53fdd60e2b928761d16ba76fa"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "870c8738c3774336baedddd0240951d078a703b8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "638e48ee39d0f2af9336f917a6f5d6692dd64d93"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "e382e0b81a3e7bd21504fee1d01ae8b08f84d3a7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "3c817a60b09eaab926e475088e750936efcc95ae"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.175,6.1.188)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.140,6.6.157)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.90,6.12.110)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.32,6.18.51)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.9,7.1)"}}], "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": "semver", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.188,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.157,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.110,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.51,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.5,7.2.*]"}}, {"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": "2026-09-18T09:45:06.368838+00:00", "updated": "2026-09-20T06:00:13.773506+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-680", "CWE-119"]}