{ "cveId": "CVE-2026-89787", "url": "https://patchblox.com/security/cve/CVE-2026-89787", "summary": "CVE-2026-89787 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2026-89787, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "ext4: check dir entry fits before reading the hash trailer in ext4_search_dir()", "description": "In the Linux kernel, the following vulnerability has been resolved: ext4: check dir entry fits before reading the hash trailer in ext4_search_dir() For casefolded encrypted directories ext4 stores an 8-byte hash trailer after the name (EXT4_DIRENT_HASHES()), at an offset derived from de-\u003Ename_len. On the sb_no_casefold_compat_fallback() path ext4_match() reads that trailer, but ext4_search_dir()\u0027s by-hand pre-check only tests de-\u003Ename \u002B de-\u003Ename_len \u003C= dlimit, which proves the name fits, not the rounded trailer. A crafted entry whose name ends at the block boundary passes the check while EXT4_DIRENT_HASHES(de) lands past the block end, so ext4_match() reads out of bounds on an ordinary lookup. KASAN reports it as a use-after-free when the page after the directory block holds a freed object: BUG: KASAN: use-after-free in ext4_match (fs/ext4/namei.c:1435) Read of size 4 at addr ffff888010458000 by task exploit Call Trace: ext4_match (fs/ext4/namei.c:1435) ext4_search_dir (fs/ext4/namei.c:1470) __ext4_find_entry (fs/ext4/namei.c:1268 fs/ext4/namei.c:1632) ext4_lookup (fs/ext4/namei.c:1703 fs/ext4/namei.c:1769) ... filename_lookup (fs/namei.c:2842) vfs_statx (fs/stat.c:353) __do_sys_newfstatat (fs/stat.c:538) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Require, for hash-in-dirent directories, that the whole entry including the rounded trailer fits before calling ext4_match(). This is the same bound ext4_check_dir_entry() already enforces via ext4_dir_rec_len(), so no well-formed entry is rejected. The other caller, ext4_find_dest_de(), runs ext4_check_dir_entry() first and is unaffected.", "published": "2026-09-16T09:17:09Z", "severity": "Moderate", "cvss": 7.8, "epss": 0.00211, "epssPercentile": 0.11435, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89787", "fixes": [ { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.7", 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