{"id":"CVE-2026-53204","summary":"firmware: stratix10-rsu: Fix NULL deref on rsu_send_msg() timeout in probe","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: stratix10-rsu: Fix NULL deref on rsu_send_msg() timeout in probe\n\nrsu_send_msg() can return -ETIMEDOUT when\nwait_for_completion_interruptible_timeout() fires while the SMC call is still\npending. In stratix10_rsu_probe(), the error paths for COMMAND_RSU_DCMF_VERSION,\nCOMMAND_RSU_DCMF_STATUS, COMMAND_RSU_MAX_RETRY and COMMAND_RSU_GET_SPT_TABLE\ncall stratix10_svc_free_channel() - which sets chan-\u003escl to NULL - but then\nfall through and queue the next request on the same channel. The next svc\nkthread that runs will dereference pdata-\u003echan-\u003escl in its receive callback\npath, triggering a NULL pointer dereference identical to the one fixed by\ncommit c45f7263100c (\"firmware: stratix10-rsu: Fix NULL pointer dereference\nwhen RSU is disabled\") for the COMMAND_RSU_STATUS path.\n\nApply the same cleanup pattern to the remaining failure paths: remove the\nasync client, free the channel, and return early so no further messages are\nqueued on a channel whose scl has been cleared.\n\nWhile at it, clean up stratix10_rsu_probe() in two ways without changing\nbehavior:\n\n- Drop redundant zero-initialization of fields already cleared by\n  devm_kzalloc(): client.receive_cb, status.* and spt0/1_address\n  (INVALID_SPT_ADDRESS is 0x0).\n\n- Replace five identical 3-line error-cleanup blocks\n  (stratix10_svc_remove_async_client() + stratix10_svc_free_channel() +\n  return ret) with goto labels (remove_async_client, free_channel),\n  matching the standard kernel resource-unwinding pattern and making it\n  easier to extend the probe sequence without forgetting matching\n  cleanup.\n\nAlso move init_completion() next to mutex_init() so sync-primitive\ninitialization is grouped before anything that could trigger a\ncallback.\n\n---\nv2: Add a minor clean-up of the function stratix10_rsu_probe() to have a\n    centralize exit for all the rsu_send_async_msg() and rsu_send_msg().","modified":"2026-07-08T08:07:24.436176547Z","published":"2026-06-25T08:39:11.618Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53204.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6bc249d324241c64118a3018124798c28e2950f7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bfd2eb9bba548a8f63c3339bb1fb9a2031a42d86"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53204.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53204"},{"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":"15847537b623f844d9a08da99ff4568315e1d4f8"},{"fixed":"6bc249d324241c64118a3018124798c28e2950f7"},{"fixed":"bfd2eb9bba548a8f63c3339bb1fb9a2031a42d86"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53204.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53204.json"}}],"schema_version":"1.7.5"}