CVE-2026-68274

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On platforms with compute-only DSS bits, the\nloop writes past the allocated buffer, corrupting adjacent slab objects.\n\nThis manifests as list_del corruption and SLUB redzone overwrites during\ndrm_managed_release on device unbind, since the overflow corrupts the\ndrmres list_head of neighboring allocations.\n\nFix by computing the allocation size using the union of both DSS masks,\nmatching the iteration pattern of for_each_dss_steering().\n\n--\nv2:\n- use bitmap_weighted_or() (Zhanjun)\n\n(cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)"}], "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 flaw is in the drm/xe GPU driver's GuC ADS/capture-list setup, reached only through local kernel device probe/GuC upload on the machine's own hardware; there is no network or remote-peer input anywhere on the path.\nAC:L - On any affected platform (one whose compute DSS mask contains bits outside the geometry DSS mask) the undersized allocation and the for_each_dss_steering() fill loop mismatch is fully deterministic, so the out-of-bounds write occurs reliably on every driver load without needing a race or a lucky memory layout.\nPR:L - The overflow happens in the xe driver's GuC initialization path, so an attacker needs only ordinary local access to a system with the affected Intel GPU present; no capability check or elevated privilege gates the corrupted code path itself.\nUI:N - No victim action is needed; the buffer overflow occurs automatically during xe_guc_ads_populate() at device probe, with no file to open, filesystem to mount, or user gesture involved.\nS:U - The out-of-bounds write corrupts kernel slab objects belonging to the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The overflow overwrites adjacent slab objects including drmres list_head pointers, and such heap metadata corruption can be leveraged to make subsequent list operations dereference attacker-influenceable heap contents, so an information-disclosure primitive cannot be ruled out.\nI:H - This is a heap out-of-bounds write past the end of the drmm_kzalloc'd extarray, overwriting neighboring allocations' contents and list linkage, which is exactly the class of corruption that yields arbitrary-write and control-flow-hijack primitives.\nA:H - The corruption is confirmed to produce list_del corruption and SLUB redzone overwrites, causing kernel oops/panic during drm_managed_release on device unbind and unpredictable slab corruption beforehand."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/xe/xe_guc_capture.c"], "versions": [{"version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "b485bfb45555163bfa5f565d6a3415fcb3035b02", "status": "affected", "versionType": "git"}, {"version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "a9a020f3c11eba6573b699f9cf9245a51b025ade", "status": "affected", "versionType": "git"}, {"version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0", "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/xe/xe_guc_capture.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "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": "6.13", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02"}, {"url": "https://git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade"}, {"url": "https://git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0"}], "title": "drm/xe/guc: Fix buffer overflow in steered register list allocation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68274", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:46:31.440786Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:58:59.226Z"}}]}}

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there is no network or remote-peer input anywhere on the path.\nAC:L - On any affected platform (one whose compute DSS mask contains bits outside the geometry DSS mask) the undersized allocation and the for_each_dss_steering() fill loop mismatch is fully deterministic, so the out-of-bounds write occurs reliably on every driver load without needing a race or a lucky memory layout.\nPR:L - The overflow happens in the xe driver's GuC initialization path, so an attacker needs only ordinary local access to a system with the affected Intel GPU present; no capability check or elevated privilege gates the corrupted code path itself.\nUI:N - No victim action is needed; the buffer overflow occurs automatically during xe_guc_ads_populate() at device probe, with no file to open, filesystem to mount, or user gesture involved.\nS:U - The out-of-bounds write corrupts kernel slab objects belonging to the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The overflow overwrites adjacent slab objects including drmres list_head pointers, and such heap metadata corruption can be leveraged to make subsequent list operations dereference attacker-influenceable heap contents, so an information-disclosure primitive cannot be ruled out.\nI:H - This is a heap out-of-bounds write past the end of the drmm_kzalloc'd extarray, overwriting neighboring allocations' contents and list linkage, which is exactly the class of corruption that yields arbitrary-write and control-flow-hijack primitives.\nA:H - The corruption is confirmed to produce list_del corruption and SLUB redzone overwrites, causing kernel oops/panic during drm_managed_release on device unbind and unpredictable slab corruption beforehand."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "b485bfb45555163bfa5f565d6a3415fcb3035b02", "versionType": "git"}, {"status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "a9a020f3c11eba6573b699f9cf9245a51b025ade", "versionType": "git"}, {"status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "lessThan": "632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/xe/xe_guc_capture.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"status": "unaffected", "version": "0", "lessThan": "6.13", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.44", "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/xe/xe_guc_capture.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02"}, {"url": "https://git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade"}, {"url": "https://git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/guc: Fix buffer overflow in steered register list allocation\n\nThe size calculation for the steered register extarray uses only the\ngeometry DSS mask (g_dss_mask) to determine the number of entries to\nallocate:\n\n total = bitmap_weight(gt->fuse_topo.g_dss_mask, ...) * steer_reg_num;\n\nHowever, the filling loop uses for_each_dss_steering(), which iterates\nover for_each_dss(), defined as the union of g_dss_mask and c_dss_mask\n(geometry + compute DSS). On platforms with compute-only DSS bits, the\nloop writes past the allocated buffer, corrupting adjacent slab objects.\n\nThis manifests as list_del corruption and SLUB redzone overwrites during\ndrm_managed_release on device unbind, since the overflow corrupts the\ndrmres list_head of neighboring allocations.\n\nFix by computing the allocation size using the union of both DSS masks,\nmatching the iteration pattern of for_each_dss_steering().\n\n--\nv2:\n- use bitmap_weighted_or() (Zhanjun)\n\n(cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.44", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "6.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:02:07.998Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68274", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:58:59.226Z", "dateReserved": "2026-07-30T09:28:09.379Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T12:01:49.762Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/gpu/drm/xe/xe_guc_capture.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b485bfb45555163bfa5f565d6a3415fcb3035b02", "status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "versionType": "git"}, {"lessThan": "a9a020f3c11eba6573b699f9cf9245a51b025ade", "status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "versionType": "git"}, {"lessThan": "632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0", "status": "affected", "version": "b170d696c1e2226713471d810c63b1162335079f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/gpu/drm/xe/xe_guc_capture.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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/xe/guc: Fix buffer overflow in steered register list allocation\n\nThe size calculation for the steered register extarray uses only the\ngeometry DSS mask (g_dss_mask) to determine the number of entries to\nallocate:\n\n total = bitmap_weight(gt->fuse_topo.g_dss_mask, ...) * steer_reg_num;\n\nHowever, the filling loop uses for_each_dss_steering(), which iterates\nover for_each_dss(), defined as the union of g_dss_mask and c_dss_mask\n(geometry + compute DSS). On platforms with compute-only DSS bits, the\nloop writes past the allocated buffer, corrupting adjacent slab objects.\n\nThis manifests as list_del corruption and SLUB redzone overwrites during\ndrm_managed_release on device unbind, since the overflow corrupts the\ndrmres list_head of neighboring allocations.\n\nFix by computing the allocation size using the union of both DSS masks,\nmatching the iteration pattern of for_each_dss_steering().\n\n--\nv2:\n- use bitmap_weighted_or() (Zhanjun)\n\n(cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)"}], "id": "CVE-2026-68274", "lastModified": "2026-10-19T21:18:00.577", "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-2026-68274", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:46:31.440786Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:16.467", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02"}], "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: Buffer overflow in drm/xe/guc can lead to denial of service.", "id": "2513329", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513329"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/xe/guc: Fix buffer overflow in steered register list allocation\nThe size calculation for the steered register extarray uses only the\ngeometry DSS mask (g_dss_mask) to determine the number of entries to\nallocate:\ntotal = bitmap_weight(gt->fuse_topo.g_dss_mask, ...) * steer_reg_num;\nHowever, the filling loop uses for_each_dss_steering(), which iterates\nover for_each_dss(), defined as the union of g_dss_mask and c_dss_mask\n(geometry + compute DSS). On platforms with compute-only DSS bits, the\nloop writes past the allocated buffer, corrupting adjacent slab objects.\nThis manifests as list_del corruption and SLUB redzone overwrites during\ndrm_managed_release on device unbind, since the overflow corrupts the\ndrmres list_head of neighboring allocations.\nFix by computing the allocation size using the union of both DSS masks,\nmatching the iteration pattern of for_each_dss_steering().\n--\nv2:\n- use bitmap_weighted_or() (Zhanjun)\n(cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)", "A flaw was found in the Linux kernel's `drm/xe/guc` component. An incorrect calculation of the steered register list allocation size can lead to a buffer overflow. This allows an attacker to write past the allocated buffer, corrupting adjacent memory objects. This memory corruption can result in system instability and a denial of service."], "name": "CVE-2026-68274", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "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": "2026-08-10T12:01:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68274\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68274\nhttps://git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0\nhttps://git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade\nhttps://git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b170d696c1e2226713471d810c63b1162335079f,b485bfb45555163bfa5f565d6a3415fcb3035b02)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b170d696c1e2226713471d810c63b1162335079f,a9a020f3c11eba6573b699f9cf9245a51b025ade)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b170d696c1e2226713471d810c63b1162335079f,632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0)"}}], "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": "6.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.44,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.6,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-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": "2026-08-10T15:30:05.873824+00:00", "updated": "2026-08-14T00:30:03.790895+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}