{"id":"CVE-2026-99056","summary":"strparser: make sure __strp_recv isn't running before tearing down the parser","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nstrparser: make sure __strp_recv isn't running before tearing down the parser\n\nThe comment above strp_done() claims that if strp is stopped,\nstrp_recv will no longer be called. That's only true if the caller has\na mechanism (eg locking) to guarantee that strp_recv() calls that\nstarted before strp_stop() have completed by the time we call\nstrp_done().\n\nThis adds a dummy lock_sock/release_sock pair to guarantee that any\nin-flight strp_recv() (which runs under either bh_lock_sock or\nlock_sock, depending if it's called from -\u003esk_data_ready or strp_work)\nhas completed.\n\nOnly espintcp can be affected by this race condition, but this patch\nmakes sure no future user of strp can have the bug.\n\nThis could crash on strp-\u003esk (\"general mode\" of strp), but this mode\nhas been here for 9 years and has never been used. It'll be gone soon,\nno point worrying about it.\n\nSwitch the stopped/paused/etc bits to u8's to avoid races between\nstrp_stop() and strp_pause/unpause().\n\nA reproducer has been published and turns the possible UAF into an\nexploit [1].","modified":"2026-11-01T02:33:46.377464334Z","published":"2026-10-23T12:22:42.234Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99056.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61cc5dac60d50dee06cf5c7b7ab246f9c825a715"},{"type":"WEB","url":"https://git.kernel.org/stable/c/933df60a465b1b82ff92dcd6870504da90ba4e9b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b09071e2f8460b35c7d355addad0fc7b31c6904d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99056.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99056"},{"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":"e27cca96cd68fa2c6814c90f9a1cfd36bb68c593"},{"fixed":"b09071e2f8460b35c7d355addad0fc7b31c6904d"},{"fixed":"933df60a465b1b82ff92dcd6870504da90ba4e9b"},{"fixed":"61cc5dac60d50dee06cf5c7b7ab246f9c825a715"},{"fixed":"a18dd388045dc7263d99a07db9de4e0f149ca8f1"},{"fixed":"9f3e9fe1b155e9b4572054d8d140586bc3512ecf"},{"fixed":"d2b5f637b9b67a79a50d42614d10653c13b4e449"},{"fixed":"eaa3a29004c063d7e9d5ea55636f693f67e6db0f"},{"fixed":"0984ebc631792acf8fff105112ee74a6b8f1efcc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99056.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.6.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-99056.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}