{"id":"CVE-2026-43401","summary":"cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()\n\nThe update_cpu_qos_request() function attempts to initialize the 'freq'\nvariable by dereferencing 'cpudata' before verifying if the 'policy'\nis valid.\n\nThis issue occurs on systems booted with the \"nosmt\" parameter, where\nall_cpu_data[cpu] is NULL for the SMT sibling threads. As a result,\nany call to update_qos_requests() will result in a NULL pointer\ndereference as the code will attempt to access pstate.turbo_freq using\nthe NULL cpudata pointer.\n\nAlso, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap()\nafter initializing the 'freq' variable, so it is better to defer the\n'freq' until intel_pstate_get_hwp_cap() has been called.\n\nFix this by deferring the 'freq' assignment until after the policy and\ndriver_data have been validated.\n\n[ rjw: Added one paragraph to the changelog ]","modified":"2026-07-15T01:49:12.484286369Z","published":"2026-05-08T14:21:42.876Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43401.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/42738dffb7b0766a45882dff7989401d78f66f92"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43401.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43401"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ae1bdd23b99f64335c69d546bff99ca39b894c18"},{"fixed":"6bfda7ce56e7d14a677b7bcd6c7a5009cc29aa88"},{"fixed":"42738dffb7b0766a45882dff7989401d78f66f92"},{"fixed":"ab39cc4cb8ceecdc2b61747433e7237f1ac2b789"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43401.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43401.json"}}],"schema_version":"1.7.5"}