{"id":"CVE-2026-53356","state":"PUBLISHED","title":"drm/i915/gem: Fix phys BO pread/pwrite with offset","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gem: Fix phys BO pread/pwrite with offset\n\nsg_page() returns struct page pointer not (void *) so the scaling\nof pread/pwrite is wrong for phys BO and wrong parts of BO would be\naccessed if non-zero offset is used.\n\nLast impacted platform with overlay or cursor planes using phys\nmapping was Gen3/945G/Lakeport.\n\n(cherry picked from commit 3e49a2f85070b2fb672c1e0fdba281a4ea3aebe6)","publishedAt":"2026-07-01T13:32:31.428Z","updatedAt":"2026-10-19T20:07:43.886Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux 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Fix phys BO pread/pwrite with offset","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gem: Fix phys BO pread/pwrite with offset\n\nsg_page() returns struct page pointer not (void *) so the scaling\nof pread/pwrite is wrong for phys BO and wrong parts of BO would be\naccessed if non-zero offset is used.\n\nLast impacted platform with overlay or cursor planes using phys\nmapping was Gen3/945G/Lakeport.\n\n(cherry picked from commit 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- The vulnerable path is reached through local DRM/i915 ioctls, specifically GEM pread/pwrite on a phys-backed buffer object. It is not reachable from network, adjacent, or physical device input.\nAC:L - Once on an affected legacy i915 platform with a phys-backed cursor/overlay BO, a nonzero offset reliably triggers the bad scaled pointer arithmetic. There is no race or attacker-external timing condition.\nPR:L - The attacker needs local access to the DRM device and enough ordinary DRM/KMS access to create and pin a framebuffer-backed GEM object, but not real root or CAP_SYS_ADMIN. The pread/pwrite ioctls themselves are render-allowed.\nUI:N - No victim action is required after the attacker has local DRM access. The attacker can issue the needed ioctls directly.\nS:U - The vulnerability is a kernel memory access bug reachable from a kernel driver ioctl path. It does not cross a separate security authority such as a VM host boundary.\nC:H - The faulty phys BO pread path can copy out-of-bounds kernel memory back to userspace. This is a high confidentiality impact because it can disclose kernel memory beyond the intended buffer.\nI:H - The faulty phys BO pwrite path can copy attacker-controlled data out of bounds into kernel memory relative to the coherent allocation. This is kernel memory corruption and can plausibly be leveraged for privilege escalation.\nA:H - The out-of-bounds read/write can corrupt or access invalid kernel memory and cause an oops, panic, or hang. Repeated triggering is possible through local ioctls on the affected object."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:35:05.605Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.143"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:23:21.482Z"},"x_adpType":"supplier"},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-53356","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:28:39.314714Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1164","lang":"en","type":"CWE","description":"CWE-1164 Irrelevant Code"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:07:43.886Z"}}]}}}