{"id":"CVE-2026-46197","state":"PUBLISHED","title":"drm/amdkfd: validate SVM ioctl nattr against buffer size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: validate SVM ioctl nattr against buffer size\n\nValidate nattr field against the buffer size, preventing\nout-of-bounds buffer access via user-controlled attribute count.\n\n(cherry picked from commit 5eca8bfdfa456c3304ca77523718fe24254c172f)","publishedAt":"2026-05-28T09:40:13.722Z","updatedAt":"2026-10-19T19:36:54.598Z","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 Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"daa8bc5f83814b55b71d2b5b3a090d57a5219c21","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"fb07a0c9c8419164812e07274947f11b1d92dd61","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"91c6dc5a41695d02dfc6299f106ac38a6c493e52","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"ccd060b5c7cc75ae7e211c250b97c5b6272e7efc","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"db9530a9873a7c85d2266a922589ebcf427fa631","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"6abd3a4417cb73a7d0db7e25bf11fae1074bdba3","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"045e0ff208f0838a246c10204105126611b267a1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_chardev.c","drivers/gpu/drm/amd/amdkfd/kfd_priv.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.90","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.32","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.9","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_chardev.c","drivers/gpu/drm/amd/amdkfd/kfd_priv.h"]}],"references":["https://git.kernel.org/stable/c/daa8bc5f83814b55b71d2b5b3a090d57a5219c21","https://git.kernel.org/stable/c/fb07a0c9c8419164812e07274947f11b1d92dd61","https://git.kernel.org/stable/c/91c6dc5a41695d02dfc6299f106ac38a6c493e52","https://git.kernel.org/stable/c/ccd060b5c7cc75ae7e211c250b97c5b6272e7efc","https://git.kernel.org/stable/c/db9530a9873a7c85d2266a922589ebcf427fa631","https://git.kernel.org/stable/c/6abd3a4417cb73a7d0db7e25bf11fae1074bdba3","https://git.kernel.org/stable/c/045e0ff208f0838a246c10204105126611b267a1"],"weaknesses":["CWE-120"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46197.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46197","state":"PUBLISHED","datePublished":"2026-05-28T09:40:13.722Z","dateUpdated":"2026-10-19T19:36:54.598Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.104Z"},"containers":{"cna":{"title":"drm/amdkfd: validate SVM ioctl nattr against buffer size","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: validate SVM ioctl nattr against buffer size\n\nValidate nattr field against the buffer size, preventing\nout-of-bounds buffer access via user-controlled attribute count.\n\n(cherry picked from commit 5eca8bfdfa456c3304ca77523718fe24254c172f)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"daa8bc5f83814b55b71d2b5b3a090d57a5219c21","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"fb07a0c9c8419164812e07274947f11b1d92dd61","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"91c6dc5a41695d02dfc6299f106ac38a6c493e52","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"ccd060b5c7cc75ae7e211c250b97c5b6272e7efc","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"db9530a9873a7c85d2266a922589ebcf427fa631","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"6abd3a4417cb73a7d0db7e25bf11fae1074bdba3","versionType":"git"},{"version":"42de677f79999791bee4e21be318c32d90ab62c6","status":"affected","lessThan":"045e0ff208f0838a246c10204105126611b267a1","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_chardev.c","drivers/gpu/drm/amd/amdkfd/kfd_priv.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.15.209","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.175","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.90","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.32","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.9","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_chardev.c","drivers/gpu/drm/amd/amdkfd/kfd_priv.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/daa8bc5f83814b55b71d2b5b3a090d57a5219c21"},{"url":"https://git.kernel.org/stable/c/fb07a0c9c8419164812e07274947f11b1d92dd61"},{"url":"https://git.kernel.org/stable/c/91c6dc5a41695d02dfc6299f106ac38a6c493e52"},{"url":"https://git.kernel.org/stable/c/ccd060b5c7cc75ae7e211c250b97c5b6272e7efc"},{"url":"https://git.kernel.org/stable/c/db9530a9873a7c85d2266a922589ebcf427fa631"},{"url":"https://git.kernel.org/stable/c/6abd3a4417cb73a7d0db7e25bf11fae1074bdba3"},{"url":"https://git.kernel.org/stable/c/045e0ff208f0838a246c10204105126611b267a1"}],"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 vulnerability is reached through an ioctl (AMDKFD_IOC_SVM) on the /dev/kfd character device, requiring local system access; there is no network or adjacent vector.\nAC:L - The attacker fully controls both the buffer size (usize via _IOC_SIZE) and the nattr count, so the out-of-bounds access is triggered reliably with no conditions outside the attacker's control.\nPR:L - The SVM ioctl descriptor has flags=0 with no capability check, so only the ability to open /dev/kfd (a basic local user, e.g. render-group membership on compute systems) is required — no real root.\nUI:N - The attacker issues the ioctl directly; no action by another user or victim is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no IOMMU/DMA or VM boundary crossing.\nC:H - The unbounded nattr loop reads kernel heap/stack memory far past the buffer (an unbounded OOB read), and the resulting memory corruption can be leveraged for information disclosure.\nI:H - The svm_range_get_attr fill-values loop writes attrs[i].value/type out of bounds into adjacent kernel memory, an OOB write that can be leveraged for control-flow corruption or arbitrary write.\nA:H - A large nattr reliably drives the attribute loops past the allocation into unmapped memory, causing a kernel oops/panic (denial of service)."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:30:21.898Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.209"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.175"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.90"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.32"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.0.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-46197","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:20:59.237887Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","lang":"en","type":"CWE","description":"CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:36:54.598Z"}}]}}}