{"id":"CVE-2026-68192","summary":"wifi: brcmfmac: make release_scratchbuffers idempotent","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: make release_scratchbuffers idempotent\n\nbrcmf_pcie_release_scratchbuffers() frees the shared.scratch and\nshared.ringupd DMA buffers with dma_free_coherent() but does not clear\nthe pointers afterwards, unlike the sibling release_ringbuffers() which\nNULLs commonrings/flowrings/idxbuf on release.\n\nBoth the bus_reset .reset callback (brcmf_pcie_reset) and\nbrcmf_pcie_remove() call release_scratchbuffers.  When reset teardown\nhas run before removal, remove's own teardown would call\ndma_free_coherent() a second time on the already-freed DMA allocation.\n\nNULL the pointers after free, matching release_ringbuffers(), so a later\nrelease observes that the allocation has already been released.  This\npatch makes repeated sequential release safe; the reset-work lifetime is\nhandled separately by the following patch.\n\nThis issue was found by an in-house static analysis tool.","modified":"2026-08-21T03:30:30.171594996Z","published":"2026-08-10T12:00:10.041Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68192.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22"},{"type":"WEB","url":"https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68192.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68192"},{"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":"4684997d9eea29380000e062755aa6d368d789a3"},{"fixed":"81c58a206d1deee01f4c29236d4154c0872f2a38"},{"fixed":"382ee00b2d1e31869ae576a60d3fbe7a2153512f"},{"fixed":"739b686aecdb14a6065300ea53401f043e51fd22"},{"fixed":"b7d1d8cb1bdca56aecebacd2896615da0acc126a"},{"fixed":"5a045c2f0fbf029873d2295178fa0785ade35af0"},{"fixed":"044fca8f45ba9ab6ca526163155234cf88287ff5"},{"fixed":"0ca80328df23f851c86866720d4977783c919ee6"},{"fixed":"538c51e9d124cf656f2dd0c0394a8545efc7102d"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68192.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.2.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68192.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}