{"cve":"CVE-2024-40979","nvd":{"published":"2024-07-12T13:15:19.477","modified":"2026-10-03T11:17:29.970","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix kernel crash during resume\n\nCurrently during resume, QMI target memory is not properly handled, resulting\nin kernel crash in case DMA remap is not supported:\n\nBUG: Bad page state in process kworker/u16:54  pfn:36e80\npage: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36e80\npage dumped because: nonzero _refcount\nCall Trace:\n bad_page\n free_page_is_bad_report\n __free_pages_ok\n __free_pages\n dma_direct_free\n dma_free_attrs\n ath12k_qmi_free_target_mem_chunk\n ath12k_qmi_msg_mem_request_cb\n\nThe reason is:\nOnce ath12k module is loaded, firmware sends memory request to host. In case\nDMA remap not supported, ath12k refuses the first request due to failure in\nallocating with large segment size:\n\nath12k_pci 0000:04:00.0: qmi firmware request memory request\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 7077888\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 8454144\nath12k_pci 0000:04:00.0: qmi dma allocation failed (7077888 B type 1), will try later with small size\nath12k_pci 0000:04:00.0: qmi delays mem_request 2\nath12k_pci 0000:04:00.0: qmi firmware request memory request\n\nLater firmware comes back with more but small segments and allocation\nsucceeds:\n\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 262144\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 524288\nath12k_pci 0000:04:00.0: qmi mem seg type 4 size 65536\nath12k_pci 0000:04:00.0: qmi mem seg type 1 size 524288\n\nNow ath12k is working. If suspend is triggered, firmware will be reloaded\nduring resume. As same as before, firmware requests two large segments at\nfirst. In ath12k_qmi_msg_mem_request_cb() segment count and size are\nassigned:\n\n\tab->qmi.mem_seg_count == 2\n\tab->qmi.target_mem[0].size == 7077888\n\tab->qmi.target_mem[1].size == 8454144\n\nThen allocation failed like before and ath12k_qmi_free_target_mem_chunk()\nis called to free all allocated segments. Note the first segment is skipped\nbecause its v.addr is cleared due to allocation failure:\n\n\tchunk->v.addr = dma_alloc_coherent()\n\nAlso note that this leaks that segment because it has not been freed.\n\nWhile freeing the second segment, a size of 8454144 is passed to\ndma_free_coherent(). However remember that this segment is allocated at\nthe first time firmware is loaded, before suspend. So its real size is\n524288, much smaller than 8454144. As a result kernel found we are freeing\nsome memory which is in use and thus cras\n---truncated---","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-401","CWE-763"],"references":["https://git.kernel.org/stable/c/303c017821d88ebad887814114d4e5966d320b28","https://git.kernel.org/stable/c/7e323cb55705398123ae087d4870c44e0424e7c0","https://git.kernel.org/stable/c/bb50a4e711ff95348ad53641acb1306d89eb4c3a","https://git.kernel.org/stable/c/303c017821d88ebad887814114d4e5966d320b28","https://git.kernel.org/stable/c/bb50a4e711ff95348ad53641acb1306d89eb4c3a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2024-40979","score":0.00302,"percentile":0.2274,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}