{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-89809 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-89809 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-89809 and fix it if it is affected.\n\nWhat it is: CVE-2026-89809 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-89809 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-89809/ (Markdown: https://insights.sbomify.com/CVE-2026-89809/index.md)","id":"CVE-2026-89809","markdown":"https://insights.sbomify.com/CVE-2026-89809/index.md","name":"CVE-2026-89809","record":{"aliases":["AZL-101625","DEBIAN-CVE-2026-89809","GHSA-634r-724x-3g6w","UBUNTU-CVE-2026-89809"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can cause a kernel crash by reading a debugfs file while a KFD queue is active, leading to denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix scope of mqd_mgr dereference in pqm_debugfs_mqds\n\nReading /sys/kernel/debug/kfd/mqds while a process holds an active KFD\nqueue triggers a NULL pointer dereference because the for loop that\ncalls mqd_mgr-\u003edebugfs_show_mqd() is incorrectly placed outside the\nif (pqn-\u003eq) block that initializes mqd_mgr.\n\nThe queue list can contain entries where pqn-\u003eq is NULL (kernel queues\nwhere only pqn-\u003ekq is valid). In the original code:\n\n  if (pqn-\u003eq) {\n      ...\n      mqd_mgr = q-\u003edevice-\u003edqm-\u003emqd_mgrs[mqd_type];\n      size = mqd_mgr-\u003emqd_stride(...);\n  }\n\n  for (xcc = 0; xcc \u003c num_xccs; xcc++) {  // WRONG: outside if block\n      mqd = q-\u003emqd + size * xcc;\n      r = mqd_mgr-\u003edebugfs_show_mqd(m, mqd);\n  }\n\nWhen iterating over a queue node where pqn-\u003eq is NULL:\n1. The if (pqn-\u003eq) block is skipped\n2. mqd_mgr remains uninitialized (NULL from declaration)\n3. The for loop executes anyway\n4. mqd_mgr-\u003edebugfs_show_mqd(m, mqd) dereferences NULL\n\nThe crash manifests as:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  #PF: supervisor instruction fetch in kernel mode\n  RIP: 0010:0x0\n  Call Trace:\n   pqm_debugfs_mqds+0x10c/0x1d0 [amdgpu]\n   kfd_debugfs_mqds_by_process+0x9b/0x110 [amdgpu]\n   seq_read_iter+0x132/0x4b0\n   ...\n\nFix by moving the for loop inside the if (pqn-\u003eq) block, so mqd_mgr\nand related variables are only used when properly initialized.\n\n(cherry picked from commit 8bfe29d5c798940f797aa24135d2734c3ffce9de)","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"drm/amdkfd: fix scope of mqd_mgr dereference in pqm_debugfs_mqds","id":"CVE-2026-89809","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"drm/amdkfd: Fix error path at svm_migrate_copy_to_ram","id":"CVE-2026-89810"},"packages":[],"prev":{"headline":"drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram","id":"CVE-2026-89808"},"products":["Linux"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A local attacker can cause a kernel crash by reading a debugfs file while a KFD queue is active, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-89809/"}