CVE-2026-68253

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Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)"}], "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 overflow is reached through a local DRM atomic modeset ioctl on /dev/dri/cardN that sets the \"Content Protection\" connector property, driving intel_hdcp_enable() -> intel_hdcp_prepare_streams(); no network or remote path exists to the i915 display HDCP code.\nAC:L - Any DP MST topology with more connected MST connectors on one digital port than the device has pipes (a common dock/hub/daisy-chain setup, and easily arranged by anyone with access to the machine's display outputs) makes every HDCP enable request overflow the buffer deterministically, with no race or memory-layout condition to win.\nPR:L - The attacker only needs access to the DRM device node as DRM master, which an ordinary user in a local graphical session (video/render group, logind seat) has; no CAP_SYS_ADMIN or root is required to request HDCP content protection on an MST connector.\nUI:N - The attacker performs the atomic commit that requests content protection themselves; no action by another user is needed, and on a system already running a compositor with HDCP desired the overflow occurs automatically on the modeset.\nS:U - The corruption is confined to kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The out-of-bounds write corrupts adjacent objects in a small kmalloc slab, and such heap corruption is a standard primitive for pivoting to arbitrary kernel memory disclosure by overwriting neighbouring pointers or length fields.\nI:H - This is a heap out-of-bounds write past a kzalloc'd streams[] buffer sized to INTEL_NUM_PIPES, with attacker-influenced VCPI values and an attacker-controlled overflow length determined by the MST topology, giving corruption of adjacent slab objects that can be leveraged for control-flow hijack.\nA:H - Overwriting adjacent slab allocations reliably produces slab corruption, oops, or panic, and the path can be re-triggered on every HDCP enable/modeset, so the system can be crashed repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/i915/display/intel_hdcp.c"], "versions": [{"version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "336cf6d80d41457442b659e7ba7a7badc0ffe79d", "status": "affected", "versionType": "git"}, {"version": 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no network or remote path exists to the i915 display HDCP code.\nAC:L - Any DP MST topology with more connected MST connectors on one digital port than the device has pipes (a common dock/hub/daisy-chain setup, and easily arranged by anyone with access to the machine's display outputs) makes every HDCP enable request overflow the buffer deterministically, with no race or memory-layout condition to win.\nPR:L - The attacker only needs access to the DRM device node as DRM master, which an ordinary user in a local graphical session (video/render group, logind seat) has; no CAP_SYS_ADMIN or root is required to request HDCP content protection on an MST connector.\nUI:N - The attacker performs the atomic commit that requests content protection themselves; no action by another user is needed, and on a system already running a compositor with HDCP desired the overflow occurs automatically on the modeset.\nS:U - The corruption is confined to kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The out-of-bounds write corrupts adjacent objects in a small kmalloc slab, and such heap corruption is a standard primitive for pivoting to arbitrary kernel memory disclosure by overwriting neighbouring pointers or length fields.\nI:H - This is a heap out-of-bounds write past a kzalloc'd streams[] buffer sized to INTEL_NUM_PIPES, with attacker-influenced VCPI values and an attacker-controlled overflow length determined by the MST topology, giving corruption of adjacent slab objects that can be leveraged for control-flow hijack.\nA:H - Overwriting adjacent slab allocations reliably produces slab corruption, oops, or panic, and the path can be re-triggered on every HDCP enable/modeset, so the system can be crashed repeatedly."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "336cf6d80d41457442b659e7ba7a7badc0ffe79d", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "389079bf04e6f0c6f10f5b879f6d7a9cf80f0567", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "84351f12390349ba010920fc247e1a0b12e41eb3", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "2106fb490b2c6003e23ad6ff36ce823a2170e138", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "3d2ef8d389495e7889c6062d8bddc46d2a5fbdef", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "984085c5b53572e2e03fd5fc4817e86ef1effc6e", "versionType": "git"}, {"status": "affected", "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "bbb15a6b042d02e5508a02b4847e02d2579ee7bc", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/i915/display/intel_hdcp.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"status": "unaffected", "version": "0", "lessThan": "5.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.217", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.184", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/i915/display/intel_hdcp.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d"}, {"url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567"}, {"url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3"}, {"url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138"}, {"url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef"}, {"url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e"}, {"url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hdcp: check streams[] bounds before overflow\n\nThe data->streams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.217", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.184", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.151", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.103", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:11.002Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68253", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:58:58.090Z", "dateReserved": "2026-07-30T09:28:09.377Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T12:01:19.402Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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Move the overflow check before the write.\n\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\n\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)"}], "id": "CVE-2026-68253", "lastModified": "2026-10-19T21:17:59.257", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68253", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:46:10.410821Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:13.860", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/336cf6d80d41457442b659e7ba7a7badc0ffe79d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/389079bf04e6f0c6f10f5b879f6d7a9cf80f0567"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Linux kernel drm/i915/hdcp: Memory corruption due to incorrect buffer overflow check", "id": "2513192", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513192"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/i915/hdcp: check streams[] bounds before overflow\nThe data->streams[] overflow check is done after the buffer overflow has\nalready happened. Move the overflow check before the write.\nSide note, emitting a warning splat with a backtrace might be overkill\nhere, but prefer not changing the behaviour other than not doing the\noverrun.\nDiscovered using AI-assisted static analysis confirmed by Intel Product\nSecurity.\n(cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)", "A flaw was found in the Linux kernel's `drm/i915/hdcp` component, which handles display-related operations. This vulnerability arises because a check for buffer overflow is performed after the overflow has already occurred during a write operation. This improper handling of memory boundaries can lead to memory corruption, potentially allowing a local attacker to cause system instability or a denial of service."], "name": "CVE-2026-68253", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:01:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68253\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68253\nhttps://git.kernel.org/stable/c/2106fb490b2c6003e23ad6ff36ce823a2170e138\nhttps://git.kernel.org/stable/c/3d2ef8d389495e7889c6062d8bddc46d2a5fbdef\nhttps://git.kernel.org/stable/c/84351f12390349ba010920fc247e1a0b12e41eb3\nhttps://git.kernel.org/stable/c/984085c5b53572e2e03fd5fc4817e86ef1effc6e\nhttps://git.kernel.org/stable/c/bbb15a6b042d02e5508a02b4847e02d2579ee7bc"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9,84351f12390349ba010920fc247e1a0b12e41eb3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9,2106fb490b2c6003e23ad6ff36ce823a2170e138)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9,3d2ef8d389495e7889c6062d8bddc46d2a5fbdef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9,984085c5b53572e2e03fd5fc4817e86ef1effc6e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9,bbb15a6b042d02e5508a02b4847e02d2579ee7bc)"}}], "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": "5.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc2,*]"}}], "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": "2026-08-10T17:45:04.460100+00:00", "updated": "2026-08-14T00:30:03.799328+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}