{"id":"CVE-2026-43370","state":"PUBLISHED","title":"drm/amdgpu: Fix use-after-free race in VM acquire","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix use-after-free race in VM acquire\n\nReplace non-atomic vm->process_info assignment with cmpxchg()\nto prevent race when parent/child processes sharing a drm_file\nboth try to acquire the same VM after fork().\n\n(cherry picked from commit c7c573275ec20db05be769288a3e3bb2250ec618)","publishedAt":"2026-05-08T14:21:21.926Z","updatedAt":"2026-10-19T19:16:27.897Z","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":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"ae87aea330c24f462fc7058ed543ba8bc6798447","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"46d309996bd9251792d7dafdbaf615cf202b4447","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"e61e355cbe49e585097eee28c15b862bfb1c0668","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"c658c1c85ec235b7ecfbf8dbfee385b1332088f4","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"904025fa8bba1d028adade33346372b4ac1a9249","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"7885eb335d8f9e9942925d57e300a85e3f82ded4","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"94b7782d0c8024f5b88454241c8d4777076c3786","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"2c1030f2e84885cc58bffef6af67d5b9d2e7098f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","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/amdgpu/amdgpu_amdkfd_gpuvm.c"]}],"references":["https://git.kernel.org/stable/c/ae87aea330c24f462fc7058ed543ba8bc6798447","https://git.kernel.org/stable/c/46d309996bd9251792d7dafdbaf615cf202b4447","https://git.kernel.org/stable/c/e61e355cbe49e585097eee28c15b862bfb1c0668","https://git.kernel.org/stable/c/c658c1c85ec235b7ecfbf8dbfee385b1332088f4","https://git.kernel.org/stable/c/904025fa8bba1d028adade33346372b4ac1a9249","https://git.kernel.org/stable/c/7885eb335d8f9e9942925d57e300a85e3f82ded4","https://git.kernel.org/stable/c/94b7782d0c8024f5b88454241c8d4777076c3786","https://git.kernel.org/stable/c/2c1030f2e84885cc58bffef6af67d5b9d2e7098f"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43370.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43370","state":"PUBLISHED","datePublished":"2026-05-08T14:21:21.926Z","dateUpdated":"2026-10-19T19:16:27.897Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:56.006Z"},"containers":{"cna":{"title":"drm/amdgpu: Fix use-after-free race in VM acquire","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix use-after-free race in VM acquire\n\nReplace non-atomic vm->process_info assignment with cmpxchg()\nto prevent race when parent/child processes sharing a drm_file\nboth try to acquire the same VM after fork().\n\n(cherry picked from commit c7c573275ec20db05be769288a3e3bb2250ec618)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"ae87aea330c24f462fc7058ed543ba8bc6798447","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"46d309996bd9251792d7dafdbaf615cf202b4447","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"e61e355cbe49e585097eee28c15b862bfb1c0668","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"c658c1c85ec235b7ecfbf8dbfee385b1332088f4","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"904025fa8bba1d028adade33346372b4ac1a9249","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"7885eb335d8f9e9942925d57e300a85e3f82ded4","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"94b7782d0c8024f5b88454241c8d4777076c3786","versionType":"git"},{"version":"ede0dd86f45adf2b7083bb161f6bc81da5fe2bad","status":"affected","lessThan":"2c1030f2e84885cc58bffef6af67d5b9d2e7098f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","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/amdgpu/amdgpu_amdkfd_gpuvm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ae87aea330c24f462fc7058ed543ba8bc6798447"},{"url":"https://git.kernel.org/stable/c/46d309996bd9251792d7dafdbaf615cf202b4447"},{"url":"https://git.kernel.org/stable/c/e61e355cbe49e585097eee28c15b862bfb1c0668"},{"url":"https://git.kernel.org/stable/c/c658c1c85ec235b7ecfbf8dbfee385b1332088f4"},{"url":"https://git.kernel.org/stable/c/904025fa8bba1d028adade33346372b4ac1a9249"},{"url":"https://git.kernel.org/stable/c/7885eb335d8f9e9942925d57e300a85e3f82ded4"},{"url":"https://git.kernel.org/stable/c/94b7782d0c8024f5b88454241c8d4777076c3786"},{"url":"https://git.kernel.org/stable/c/2c1030f2e84885cc58bffef6af67d5b9d2e7098f"}],"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 AMD KFD/amdgpu device ioctls, especially acquiring an amdgpu render-node VM through /dev/kfd. No network or physical-device packet path reaches this code.\nAC:L - The race is between attacker-controlled processes sharing the same drm_file after fork and issuing concurrent VM-acquire operations. Because the attacker controls both sides of the race, this is low complexity.\nPR:L - An unprivileged local user with access to /dev/kfd and the amdgpu render node can issue the relevant ioctls; no real root or init-namespace capability check is required. This is basic local user access rather than administrative privilege.\nUI:N - Exploitation does not require a victim user action after the attacker has local execution and device access. The attacker can open the device files, fork, and invoke the ioctls directly.\nS:U - The bug corrupts kernel driver state within the same kernel security authority. It is a standard local kernel memory-corruption/privilege-escalation scenario, not a VM escape or other scope change.\nC:H - The non-atomic VM ownership assignment can leave stale amdkfd_process_info references and cause a kernel use-after-free. Following kernel UAF scoring guidance, this can be leveraged for high-impact information disclosure.\nI:H - The freed process_info object contains list, mutex, fence, and process state used later by KFD/GPUVM paths, making this kernel memory corruption. A defensible worst case is arbitrary kernel memory modification or control-flow influence.\nA:H - Even without full exploitation, the UAF and associated list/lifetime corruption can crash or hang the kernel. Kernel oops/panic-level denial of service is high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:27:32.528Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.19.9"},{"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-2026-43370","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:16:53.007366Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:16:27.897Z"}}]}}}