{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68253", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.377Z", "datePublished": "2026-08-10T12:01:19.402Z", "dateUpdated": "2026-08-23T12:46:11.002Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:11.002Z" }, "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)" } ], "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": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "389079bf04e6f0c6f10f5b879f6d7a9cf80f0567", "status": "affected", "versionType": "git" }, { "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "84351f12390349ba010920fc247e1a0b12e41eb3", "status": "affected", "versionType": "git" }, { "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "2106fb490b2c6003e23ad6ff36ce823a2170e138", "status": "affected", "versionType": "git" }, { "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "3d2ef8d389495e7889c6062d8bddc46d2a5fbdef", "status": "affected", "versionType": "git" }, { "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "984085c5b53572e2e03fd5fc4817e86ef1effc6e", "status": "affected", "versionType": "git" }, { "version": "e03187e12cae57c09b521b6f7dd7c7f9aa2b62e9", "lessThan": "bbb15a6b042d02e5508a02b4847e02d2579ee7bc", "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/gpu/drm/i915/display/intel_hdcp.c" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.12", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.2" } ] } ] } ], "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" } ], "title": "drm/i915/hdcp: check streams[] bounds before overflow", "x_generator": { "engine": "bippy-1.2.0" } } } }