{"id":"CVE-2026-99056","title":"strparser: make sure __strp_recv isn't running before tearing down the parser","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < a18dd388045dc7263d99a07db9de4e0f149ca8f1","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 9f3e9fe1b155e9b4572054d8d140586bc3512ecf","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < d2b5f637b9b67a79a50d42614d10653c13b4e449","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < eaa3a29004c063d7e9d5ea55636f693f67e6db0f","Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 0984ebc631792acf8fff105112ee74a6b8f1efcc","Linux 5.6"],"published":"2026-10-23","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:10:15.756Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99056","references":[{"url":"https://git.kernel.org/stable/c/a18dd388045dc7263d99a07db9de4e0f149ca8f1"},{"url":"https://git.kernel.org/stable/c/9f3e9fe1b155e9b4572054d8d140586bc3512ecf"},{"url":"https://git.kernel.org/stable/c/d2b5f637b9b67a79a50d42614d10653c13b4e449"},{"url":"https://git.kernel.org/stable/c/eaa3a29004c063d7e9d5ea55636f693f67e6db0f"},{"url":"https://git.kernel.org/stable/c/0984ebc631792acf8fff105112ee74a6b8f1efcc"}],"tags":["cve.org"],"epss":0.00209,"epssPercentile":0.10488,"ingestedAt":"2026-10-23T13:24:55.521Z","slug":"CVE-2026-99056","body":"## Overview\n\nIn 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 ->sk_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->sk (\"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].\n\n## Affected\n\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < a18dd388045dc7263d99a07db9de4e0f149ca8f1`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 9f3e9fe1b155e9b4572054d8d140586bc3512ecf`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < d2b5f637b9b67a79a50d42614d10653c13b4e449`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < eaa3a29004c063d7e9d5ea55636f693f67e6db0f`\n- `Linux >= e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 < 0984ebc631792acf8fff105112ee74a6b8f1efcc`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228832,"id":"CVE-2026-99056","ts":1792854086182,"field":"cvss","old":null,"new":"7.8"},{"seq":228831,"id":"CVE-2026-99056","ts":1792854086182,"field":"severity","old":"none","new":"high"}]}