{ "cveId": "CVE-2026-89490", "url": "https://patchblox.com/security/cve/CVE-2026-89490", "summary": "CVE-2026-89490 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-89490, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix readdir position truncation on 32-bit...", "description": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix readdir position truncation on 32-bit kernels In ocfs2_dir_foreach_blk_el(), the directory cookie position is rebuilt with \tctx-\u003Epos = (ctx-\u003Epos \u0026 ~(sb-\u003Es_blocksize - 1)) | offset; \u0060ctx-\u003Epos\u0060 is loff_t (signed 64-bit), while \u0060sb-\u003Es_blocksize\u0060 is unsigned long. On 32-bit kernels unsigned long is 32-bit, so the mask \t~(sb-\u003Es_blocksize - 1) is computed as a 32-bit unsigned value (e.g. 0xfffff000 for a 4 KiB block size). In the AND expression with the 64-bit \u0060ctx-\u003Epos\u0060, that unsigned operand is zero-extended to 64 bits per the usual arithmetic conversions, yielding 0x00000000fffff000. The high 32 bits of \u0060ctx-\u003Epos\u0060 are silently cleared, even though directory size is allowed to exceed 4 GiB. When readdir() crosses the 4 GiB boundary on a 32-bit kernel the position is reset back into the first 4 GiB block, making the re-validation path re-enumerate already-returned dirents indefinitely. This is ocfs2_dir_foreach_blk_el(), the extent-list readdir path taken for all non-inline directories, so a directory large enough to cross 4 GiB reaches it. This is the same class of bug that commit 3dce5bb82c97 (\u0022exfat: Fix bitwise operation having different size\u0022) fixed in exfat, and the fix mirrors the equivalent ext4 fix in this series. Cast the operand to loff_t so the mask is 64-bit before the AND: \tctx-\u003Epos = (ctx-\u003Epos \u0026 ~((loff_t)sb-\u003Es_blocksize - 1)) | offset; 64-bit kernels are unaffected.", "published": "2026-09-11T20:19:30Z", "severity": "IMPORTANT", "cvss": 3.6, "epss": 0.00177, "epssPercentile": 0.07257, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", "fixedVersion": "0:6.12.0-207.111.5.1.el9uek", "fix": "ELSA-2026-500374", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500374", "released": "2026-10-07T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek-core", "release": "ol 10", 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