{"api_version":"1","generated_at":"2026-06-20T06:44:19+00:00","cve":"CVE-2026-46309","urls":{"html":"https://cve.report/CVE-2026-46309","api":"https://cve.report/api/cve/CVE-2026-46309.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46309","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46309"},"summary":{"title":"drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise\n\nAdd validation in xe_vm_madvise_ioctl() to reject PAT indices with\nXE_COH_NONE coherency mode when applied to CPU cached memory.\n\nUsing coh_none with CPU cached buffers is a security issue. When the\nkernel clears pages before reallocation, the clear operation stays in\nCPU cache (dirty). GPU with coh_none can bypass CPU caches and read\nstale sensitive data directly from DRAM, potentially leaking data from\npreviously freed pages of other processes.\n\nThis aligns with the existing validation in vm_bind path\n(xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Add fixes\n- Move one debug print to better place\n\nv3(Matthew Auld)\n- Should be drm/xe/uapi\n- More Cc\n\nv4(Shuicheng Lin)\n- Fix kmem leak issues by the way\n\nv5\n- Remove kmem leak because it has been merged by another patch\n\nv6\n- Remove the fix which is not related to current fix\n\nv7\n- No change\n\nv8\n- Rebase\n\nv9\n- Limit the restrictions to iGPU\n\nv10\n- No change\n\n(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-08 17:16:49","updated_at":"2026-06-08 17:16:49"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39","name":"https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00","name":"https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424","name":"https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46309","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46309","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ada7486c5668db542a7d361268df931aca5b726a 87f9b1528e1ffc1da3615d552c9a06aba5e20b00 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ada7486c5668db542a7d361268df931aca5b726a fea04cf6f2345bc50f15b6638906c35962b89424 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ada7486c5668db542a7d361268df931aca5b726a 4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.32 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.9 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46309","cve":"CVE-2026-46309","epss":"0.001640000","percentile":"0.059430000","score_date":"2026-06-15","updated_at":"2026-06-16 00:11:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/gpu/drm/xe/xe_vm_madvise.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"87f9b1528e1ffc1da3615d552c9a06aba5e20b00","status":"affected","version":"ada7486c5668db542a7d361268df931aca5b726a","versionType":"git"},{"lessThan":"fea04cf6f2345bc50f15b6638906c35962b89424","status":"affected","version":"ada7486c5668db542a7d361268df931aca5b726a","versionType":"git"},{"lessThan":"4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39","status":"affected","version":"ada7486c5668db542a7d361268df931aca5b726a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/gpu/drm/xe/xe_vm_madvise.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.32","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.32","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.9","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc2","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise\n\nAdd validation in xe_vm_madvise_ioctl() to reject PAT indices with\nXE_COH_NONE coherency mode when applied to CPU cached memory.\n\nUsing coh_none with CPU cached buffers is a security issue. When the\nkernel clears pages before reallocation, the clear operation stays in\nCPU cache (dirty). GPU with coh_none can bypass CPU caches and read\nstale sensitive data directly from DRAM, potentially leaking data from\npreviously freed pages of other processes.\n\nThis aligns with the existing validation in vm_bind path\n(xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Add fixes\n- Move one debug print to better place\n\nv3(Matthew Auld)\n- Should be drm/xe/uapi\n- More Cc\n\nv4(Shuicheng Lin)\n- Fix kmem leak issues by the way\n\nv5\n- Remove kmem leak because it has been merged by another patch\n\nv6\n- Remove the fix which is not related to current fix\n\nv7\n- No change\n\nv8\n- Rebase\n\nv9\n- Limit the restrictions to iGPU\n\nv10\n- No change\n\n(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)"}],"providerMetadata":{"dateUpdated":"2026-06-08T15:50:39.689Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00"},{"url":"https://git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424"},{"url":"https://git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39"}],"title":"drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46309","datePublished":"2026-06-08T15:50:39.689Z","dateReserved":"2026-05-13T15:03:33.111Z","dateUpdated":"2026-06-08T15:50:39.689Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-08 17:16:49","lastModifiedDate":"2026-06-08 17:16:49","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46309","Ordinal":"1","Title":"drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in ","CVE":"CVE-2026-46309","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46309","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise\n\nAdd validation in xe_vm_madvise_ioctl() to reject PAT indices with\nXE_COH_NONE coherency mode when applied to CPU cached memory.\n\nUsing coh_none with CPU cached buffers is a security issue. When the\nkernel clears pages before reallocation, the clear operation stays in\nCPU cache (dirty). GPU with coh_none can bypass CPU caches and read\nstale sensitive data directly from DRAM, potentially leaking data from\npreviously freed pages of other processes.\n\nThis aligns with the existing validation in vm_bind path\n(xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Add fixes\n- Move one debug print to better place\n\nv3(Matthew Auld)\n- Should be drm/xe/uapi\n- More Cc\n\nv4(Shuicheng Lin)\n- Fix kmem leak issues by the way\n\nv5\n- Remove kmem leak because it has been merged by another patch\n\nv6\n- Remove the fix which is not related to current fix\n\nv7\n- No change\n\nv8\n- Rebase\n\nv9\n- Limit the restrictions to iGPU\n\nv10\n- No change\n\n(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)","Type":"Description","Title":"drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in "}]}}}