{ "cveId": "CVE-2026-90048", "url": "https://patchblox.com/security/cve/CVE-2026-90048", "summary": "CVE-2026-90048 is fixed in 58 products on 1 platform, first by DEBIAN-CVE-2026-90048, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Urgent.", "title": "fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list()", "description": "In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: fix slab-out-of-bounds write in ni_create_attr_list() ni_create_attr_list() allocates a fixed buffer of al_aligned(record_size) (== record_size) bytes and then walks every attribute of the primary MFT record, writing one ATTR_LIST_ENTRY per attribute and advancing the cursor by le_size(name_len), with no check against the end of the buffer; the total size is only computed after the loop. A minimum-size resident attribute occupies SIZEOF_RESIDENT (0x18 = 24) bytes on disk, but an unnamed attribute expands to le_size(0) (0x20 = 32) bytes in the list. Because the number of attributes in a record is not bounded (mi_enum_attr() accepts arbitrarily many equal-type, nameless minimum-size attributes), a crafted record packed with such attributes produces a list larger than record_size and overflows the heap buffer. This is reachable from a crafted, loop-mounted NTFS image: opening the file and adding an attribute (e.g. via setxattr) drives ntfs_set_ea() -\u003E ni_insert_resident() -\u003E ni_insert_attr() -\u003E ni_ins_attr_ext() -\u003E ni_create_attr_list(). BUG: KASAN: slab-out-of-bounds in ni_create_attr_list\u002B0xc48/0x1058 Write of size 4 at addr ffff000008984c00 by task setfattr/345 ni_create_attr_list\u002B0xc48/0x1058 ni_ins_attr_ext\u002B0x510/0x7c0 ni_insert_attr\u002B0x3f8/0x70c ni_insert_resident\u002B0xc8/0x3b0 ntfs_set_ea\u002B0x66c/0xd28 ntfs_setxattr\u002B0x4d8/0x5b0 __arm64_sys_setxattr\u002B0xa4/0x124 Allocated by task 345: ni_create_attr_list\u002B0x188/0x1058 The buggy address belongs to the cache kmalloc-1k of size 1024 (the write lands at object\u002B1024). Size the buffer from the actual attributes instead of assuming a single record_size is always enough.", "published": "2026-09-16T11:17:18Z", "severity": "Critical", "cvss": 9.8, "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00721, "epssPercentile": 0.542, "priority": "Urgent", "priorityTier": 2, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90048", "fixes": [ { "platform": "linux", "product": "bpftool", "release": "amzn 2023", "fixedVersion": "1:6.1.189-236.399.amzn2023", "fix": "ALAS2023-2026-3336", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3336", "released": "2026-11-07T01:06:52Z" }, { "platform": "linux", "product": "bpftool-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.1.189-236.399.amzn2023", "fix": "ALAS2023-2026-3336", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3336", "released": "2026-11-07T01:06:52Z" 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