{"id":"CVE-2026-53319","summary":"blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()\n\nwbt_init_enable_default() uses WARN_ON_ONCE to check for failures from\nwbt_alloc() and wbt_init(). However, both are expected failure paths:\n\n- wbt_alloc() can return NULL under memory pressure (-ENOMEM)\n- wbt_init() can fail with -EBUSY if wbt is already registered\n\nsyzbot triggers this by injecting memory allocation failures during MTD\npartition creation via ioctl(BLKPG), causing a spurious warning.\n\nwbt_init_enable_default() is a best-effort initialization called from\nblk_register_queue() with a void return type. Failure simply means the\ndisk operates without writeback throttling, which is harmless.\n\nReplace WARN_ON_ONCE with plain if-checks, consistent with how\nwbt_set_lat() in the same file already handles these failures. Add a\npr_warn() for the wbt_init() failure to retain diagnostic information\nwithout triggering a full stack trace.","modified":"2026-07-08T08:13:45.541687676Z","published":"2026-06-26T19:41:11.269Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53319.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/e9b004ff83067cdf96774b45aea4b239ace99a2f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd7a982657077469802594a5165bc30b9a55af70"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53319.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53319"},{"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":"41afaeeda5099d9cd07eaa7dc6c3d20c6f1dd9e9"},{"fixed":"fd7a982657077469802594a5165bc30b9a55af70"},{"fixed":"e9b004ff83067cdf96774b45aea4b239ace99a2f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53319.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53319.json"}}],"schema_version":"1.7.5"}