{"id":"CVE-2026-43206","state":"PUBLISHED","title":"drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()\n\nThe kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8\nbytes via memset without checking the buffer size parameter. This allows\nunprivileged userspace to trigger an out-of bounds kernel memory write\nby passing a small buffer, leading to  potential privilege\nescalation.","publishedAt":"2026-05-06T11:28:10.937Z","updatedAt":"2026-10-19T19:16:24.115Z","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":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"3e04bc310d80b46eaf481f1fefcbcb37a187412d","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"b4034442cb090e4a980bdcc1540948606cbc951b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"4857c37c7ba9aa38b9a4c694e8bd8d0091c87940","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"75fb57efdd7863fffbc39db23e9cad7aafda26ed","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"4e72f419e4ed44cb3b60506752d8688c20a60a9b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"8a70a26c9f34baea6c3199a9862ddaff4554a96d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_events.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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_events.c"]}],"references":["https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d","https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f","https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b","https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940","https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed","https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b","https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b","https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43206.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43206","state":"PUBLISHED","datePublished":"2026-05-06T11:28:10.937Z","dateUpdated":"2026-10-19T19:16:24.115Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.993Z"},"containers":{"cna":{"title":"drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix out-of-bounds write in kfd_event_page_set()\n\nThe kfd_event_page_set() function writes KFD_SIGNAL_EVENT_LIMIT * 8\nbytes via memset without checking the buffer size parameter. This allows\nunprivileged userspace to trigger an out-of bounds kernel memory write\nby passing a small buffer, leading to  potential privilege\nescalation."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"3e04bc310d80b46eaf481f1fefcbcb37a187412d","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"b4034442cb090e4a980bdcc1540948606cbc951b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"4857c37c7ba9aa38b9a4c694e8bd8d0091c87940","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"75fb57efdd7863fffbc39db23e9cad7aafda26ed","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"4e72f419e4ed44cb3b60506752d8688c20a60a9b","versionType":"git"},{"version":"0fc8011f89feb8b2c3008583b777d097e1974660","status":"affected","lessThan":"8a70a26c9f34baea6c3199a9862ddaff4554a96d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdkfd/kfd_events.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.252","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.202","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.165","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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_events.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3e04bc310d80b46eaf481f1fefcbcb37a187412d"},{"url":"https://git.kernel.org/stable/c/de8d7a25cd2eb5875b1d8d4fbc7fe4b4138b781f"},{"url":"https://git.kernel.org/stable/c/b4034442cb090e4a980bdcc1540948606cbc951b"},{"url":"https://git.kernel.org/stable/c/4857c37c7ba9aa38b9a4c694e8bd8d0091c87940"},{"url":"https://git.kernel.org/stable/c/75fb57efdd7863fffbc39db23e9cad7aafda26ed"},{"url":"https://git.kernel.org/stable/c/bfcd6b53e1f4feb182952f4ff9a137c36ceaf20b"},{"url":"https://git.kernel.org/stable/c/4e72f419e4ed44cb3b60506752d8688c20a60a9b"},{"url":"https://git.kernel.org/stable/c/8a70a26c9f34baea6c3199a9862ddaff4554a96d"}],"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 vulnerable path is reached through local `/dev/kfd` ioctls, specifically allocating a KFD GPU memory object and passing its handle as `event_page_offset` to `AMDKFD_IOC_CREATE_EVENT`. There is no network, adjacent, or physical packet/device-input path.\nAC:L - The attacker controls the supplied event-page handle and can allocate a buffer smaller than `KFD_SIGNAL_EVENT_LIMIT * 8`, making the fixed-size `memset` out-of-bounds deterministic. No race or external condition is required.\nPR:L - The path is available to unprivileged userspace with access to KFD/AMDGPU device nodes, and the relevant ioctls have no capability flag or `capable()` gate. This is low privilege, not real administrator privilege.\nUI:N - Once a local attacker can execute code and open the device, exploitation only requires issuing ioctls. No victim user action is needed.\nS:U - The corruption occurs inside the kernel driver and impacts the same kernel security authority. This is standard local kernel compromise/DoS, not a cross-scope escape such as guest-to-host or IOMMU boundary bypass.\nC:H - The bug is an out-of-bounds kernel write into memory adjacent to a kernel-mapped GPU buffer, and kernel memory corruption can reasonably be leveraged to disclose sensitive kernel memory. Following the higher-severity rule for memory corruption, confidentiality impact is High.\nI:H - The vulnerable `memset` writes attacker-triggered data beyond the allocated object, giving a kernel memory corruption primitive. Out-of-bounds writes are scored as High integrity impact because they can plausibly be developed into privilege escalation or control-flow/data corruption.\nA:H - The out-of-bounds kernel write can corrupt adjacent kernel memory and readily crash or destabilize the kernel even without full exploitation. Kernel oops, panic, or persistent GPU/kernel failure is a High availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:26:33.242Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.10.252"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.15.202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.1.165"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43206","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:15:43.887589Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","type":"CWE","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:16:24.115Z"}}]}}}