{"id":"CVE-2026-98844","title":"kernel: netfs: clear post-EOF pagecache when extending a file via write (CVE-2026-98844)","summary":"A flaw was found in the Linux kernel's network filesystem (netfs) subsystem. When a file is extended through write operations after previous writes were performed via memory mapping, the system fails to clear stale cache data located beyon…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"vendor","cwe":"CWE-908","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","affected":["enterprise_linux 10"],"published":"2026-10-18","updated":"2026-10-23","sourceUpdated":"2026-10-23T22:09:34+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98844"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2555200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98844"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98844"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98844.mbox"},{"url":"https://git.kernel.org/stable/c/f8f7d86b3537e885ee620898a38b749fba8a8456"},{"url":"https://git.kernel.org/stable/c/98f6a4589e0f5f6cf819b8dd45605efc481c06ce"},{"url":"https://git.kernel.org/stable/c/a7036a73671fc83d299bc770710fe996d9fef9ca"},{"url":"https://git.kernel.org/stable/c/69bf14300b50631e7c2271289d347bbd1b19a06c"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00156,"epssPercentile":0.04728,"ingestedAt":"2026-10-18T16:47:32.465Z","slug":"CVE-2026-98844","body":"## Overview\n\nA flaw was found in the Linux kernel's network filesystem (netfs) subsystem. When a file is extended through write operations after previous writes were performed via memory mapping, the system fails to clear stale cache data located beyond the original end of the file. A local user could exploit this flaw to read stale data from the newly exposed file regions, leading to information disclosure and data corruption.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98844.json)\n\n**kernel: netfs: clear post-EOF pagecache when extending a file via write** — rated Low by Red Hat. Released 2026-10-18, updated 2026-10-23.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228606,"id":"CVE-2026-98844","ts":1792844811013,"field":"cvss","old":null,"new":"3.3"},{"seq":228605,"id":"CVE-2026-98844","ts":1792844811013,"field":"severity","old":"none","new":"low"}]}