{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-98959-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:44:41Z", "generator": { "date": "2026-11-07T21:44:41Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-98959-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-23T13:17:00Z", "revision_history": [ { "date": "2026-10-23T13:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:44:41Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-98959", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix xattr replace when multiple xattrs are packed in the same item\n\nIf we have a btrfs_dir_item item that packs multiple xattrs and then we\nreplace the value of one of them (with the setxattr(2) family of syscalls)\nwith another value of a different size, we end up not having a fully\ninitialized btrfs_dir_item, resulting in a corruption that the tree\nchecker will detect at extent buffer writeback time.\n\nThis is because in btrfs_setxattr() when we find a btrfs_dir_item with\nmultiple xattrs (due to the crc32c hash of their name being the same)\nwe delete one of the xattr items (btrfs_dir_item) and then insert a new\none, but the deletion and insertion results in shifting existing data in\nthe leaf and therefore when the new value of a xattr has a different size,\nthe new btrfs_dir_item is placed in a leaf section that was not\ninitialized and we only copy the value's data and set the value's length\nin the new btrfs_dir_item, without setting the name, the name's length,\nthe key (which must be all zeroes for xattrs), flags (BTRFS_FT_XATTR) and\ntransaction ID.\n\nThe following script reproduces the issue:\n\n $ cat test.sh\n #!/bin/bash\n\n DEV=/dev/sdi\n MNT=/mnt/sdi\n\n mkfs.btrfs -f $DEV\n mount $DEV $MNT\n\n touch $MNT/testfile\n\n # Add two xattrs that, on btrfs, have the same hash (crc32c) for their\n # name and therefore are packed into the same btrfs_dir_item.\n setfattr -n user.foobar -v 123 $MNT/testfile\n setfattr -n user.WvG1c1Td -v qwerty $MNT/testfile\n\n # Verify the xattrs are present.\n echo \"xattrs before:\"\n getfattr --absolute-names --dump $MNT/testfile\n\n # Now replace the value of the foobar xattr with a significantly larger\n # value.\n setfattr -n user.foobar -v abcdefghijklmnopqrstuvwxyz $MNT/testfile\n\n # Check the xattrs have the expected values.\n echo \"xattrs after:\"\n getfattr --absolute-names --dump $MNT/testfile\n\n umount $MNT\n\nRunning it:\n\n $ ./test.sh\n (...)\n xattrs before:\n # file: /mnt/sdi/testfile\n user.WvG1c1Td=\"qwerty\"\n user.foobar=\"123\"\n\n xattrs after:\n # file: /mnt/sdi/testfile\n user.WvG1c1Td=\"qwerty\"\n\nSo the \"user.foobar\" xattr is missing and there was a transaction abort\nwhen unmounting the fs with the following traces in dmesg:\n\n $ dmesg\n [869800.159271] BTRFS warning (device sdi): access to eb bytenr 30474240 len 16384 out of range start 16015 len 25964\n [869800.159293] ------------[ cut here ]------------\n [869800.159296] WARNING: fs/btrfs/extent_io.c:4408 at report_eb_range+0x44/0x60 [btrfs], CPU#8: getfattr/2605179\n [869800.168961] Modules linked in: btrfs dm_thin_pool (...)\n [869800.190527] CPU: 8 UID: 0 PID: 2605179 Comm: getfattr Tainted: G W 7.3.0-rc3-btrfs-next-244+ #1 PREEMPT(full)\n [869800.193726] Tainted: [W]=WARN\n [869800.194502] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014\n [869800.197576] RIP: 0010:report_eb_range+0x44/0x60 [btrfs]\n [869800.198985] Code: 48 8b 7b 18 (...)\n [869800.203531] RSP: 0018:ffffce4541937d58 EFLAGS: 00010246\n [869800.204609] RAX: 0000000000000000 RBX: ffff8dde054b8738 RCX: 0000000000000000\n [869800.206137] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffc04c92a0\n [869800.207645] RBP: 0000000000003e8f R08: 0000000000000000 R09: 3fffffffffefffff\n [869800.226175] R10: ffffce4541937a88 R11: 0000000000000003 R12: 000000000000656c\n [869800.227594] R13: ffff8dde14be800f R14: 000000000000656c R15: 0000000000000069\n [869800.229097] FS: 00007f59023bb780(0000) GS:ffff8de5788ed000(0000) knlGS:0000000000000000\n [869800.231137] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n [869800.232321] CR2: 0000558dc45e6a78 CR3: 0000000765b16004 CR4: 0000000000370ef0\n [869800.233783] Call Trace:\n [869800.234330] \n [869800.234791] read_extent_buffer+0x4d/0x100 [btrfs]\n [869800.235898] btrfs_listxattr+0x199/0x240 [btrfs]\n [869800.236912] vfs_listxattr+0x51/0\n---truncated---", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", 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"Amazon-Linux-2:kernel-tools-devel-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-98959" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/5877d7138cc4359d26fd7b010eedfd1b3162348f", "url": "https://git.kernel.org/stable/c/5877d7138cc4359d26fd7b010eedfd1b3162348f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7a53bb4668b319fc6c8a3ce2c21635125c7d2712", "url": "https://git.kernel.org/stable/c/7a53bb4668b319fc6c8a3ce2c21635125c7d2712" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/858bee1c77857aabcc2327cd32dd8266332de332", "url": "https://git.kernel.org/stable/c/858bee1c77857aabcc2327cd32dd8266332de332" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a97114b9b00ed3d05156f3b2ddbf797296260389", "url": "https://git.kernel.org/stable/c/a97114b9b00ed3d05156f3b2ddbf797296260389" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c1803697a60f22743aa28ad522f805e92d45e3f0", "url": "https://git.kernel.org/stable/c/c1803697a60f22743aa28ad522f805e92d45e3f0" } ], "release_date": "2026-10-23T13:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-11-05T12:53:42.499096Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221" }, { "category": "none_available", "date": "2026-10-23T13:17:00Z", "details": 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