{"id":"CVE-2026-98394","title":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.\n\nFahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait\nin unix_stream_read_ge…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.\n\nFahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait\nin unix_stream_read_ge…","severity":"medium","published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T14:17:50.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98394","references":[{"url":"https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6e5ee08eb5858d175da6768d75d163817b6a9d4a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c81c5be3826c8467945b964d0cf7f7b3d65461db","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5dd55b316ca229a4cbf11729483ba5bb57233e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98394.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98394"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2552217"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98394"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98394"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98394.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-14T15:36:13.978Z","vendor":"Linux","product":"Linux","affected":["Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 < 3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713","Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 < d5dd55b316ca229a4cbf11729483ba5bb57233e7","Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 < c81c5be3826c8467945b964d0cf7f7b3d65461db","Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 < 6e5ee08eb5858d175da6768d75d163817b6a9d4a","Linux 5.15"],"cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-835"],"epss":0.002,"epssPercentile":0.09771,"slug":"CVE-2026-98394","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.\n\nFahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait\nin unix_stream_read_generic() if recv() is blocking and the last\nskb in the queue is MSG_OOB skb.\n\nIn such a situation, TCP returns 0 immediately regardless of\nblocking or non-blocking.\n\nLet's follow the behaviour.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98394.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224105,"id":"CVE-2026-98394","ts":1792324923723,"field":"cvss","old":null,"new":"5.5"},{"seq":224104,"id":"CVE-2026-98394","ts":1792324923723,"field":"severity","old":"none","new":"medium"}]}