The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - btrfs: fix xattr replace when multiple xattrs are packed in the same item If we have a btrfs_dir_item item     that packs multiple xattrs and then we replace the value of one of them (with the setxattr(2) family of     syscalls) with another value of a different size, we end up not having a fully initialized btrfs_dir_item,     resulting in a corruption that the tree checker will detect at extent buffer writeback time. This is     because in btrfs_setxattr() when we find a btrfs_dir_item with multiple xattrs (due to the crc32c hash of     their name being the same) we delete one of the xattr items (btrfs_dir_item) and then insert a new one,     but the deletion and insertion results in shifting existing data in the leaf and therefore when the new     value of a xattr has a different size, the new btrfs_dir_item is placed in a leaf section that was not     initialized and we only copy the value's data and set the value's length in the new btrfs_dir_item,     without setting the name, the name's length, the key (which must be all zeroes for xattrs), flags     (BTRFS_FT_XATTR) and transaction ID. The following script reproduces the issue: $ cat test.sh #!/bin/bash     DEV=/dev/sdi MNT=/mnt/sdi mkfs.btrfs -f $DEV mount $DEV $MNT touch $MNT/testfile # Add two xattrs that, on     btrfs, have the same hash (crc32c) for their # name and therefore are packed into the same btrfs_dir_item.
    setfattr -n user.foobar -v 123 $MNT/testfile setfattr -n user.WvG1c1Td -v qwerty $MNT/testfile # Verify     the xattrs are present. echo xattrs before: getfattr --absolute-names --dump $MNT/testfile # Now replace     the value of the foobar xattr with a significantly larger # value. setfattr -n user.foobar -v     abcdefghijklmnopqrstuvwxyz $MNT/testfile # Check the xattrs have the expected values. echo xattrs after:
    getfattr --absolute-names --dump $MNT/testfile umount $MNT Running it: $ ./test.sh (...) xattrs before: #     file: /mnt/sdi/testfile user.WvG1c1Td=qwerty user.foobar=123 xattrs after: # file: /mnt/sdi/testfile     user.WvG1c1Td=qwerty So the user.foobar xattr is missing and there was a transaction abort when     unmounting the fs with the following traces in dmesg: $ dmesg [869800.159271] BTRFS warning (device sdi):
    access to eb bytenr 30474240 len 16384 out of range start 16015 len 25964 [869800.159293] ------------[     cut here ]------------ [869800.159296] WARNING: fs/btrfs/extent_io.c:4408 at report_eb_range+0x44/0x60     [btrfs], CPU#8: getfattr/2605179 [869800.168961] Modules linked in: btrfs dm_thin_pool (...)     [869800.190527] CPU: 8 UID: 0 PID: 2605179 Comm: getfattr Tainted: G W 7.3.0-rc3-btrfs-next-244+ #1     PREEMPT(full) [869800.193726] Tainted: [W]=WARN [869800.194502] Hardware name: QEMU Standard PC (i440FX +     PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014 [869800.197576] RIP:
    0010:report_eb_range+0x44/0x60 [btrfs] [869800.198985] Code: 48 8b 7b 18 (...) [869800.203531] RSP:
    0018:ffffce4541937d58 EFLAGS: 00010246 [869800.204609] RAX: 0000000000000000 RBX: ffff8dde054b8738 RCX:
    0000000000000000 [869800.206137] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffffc04c92a0     [869800.207645] RBP: 0000000000003e8f R08: 0000000000000000 R09: 3fffffffffefffff [869800.226175] R10:
    ffffce4541937a88 R11: 0000000000000003 R12: 000000000000656c [869800.227594] R13: ffff8dde14be800f R14:
    000000000000656c R15: 0000000000000069 [869800.229097] FS: 00007f59023bb780(0000)     GS:ffff8de5788ed000(0000) knlGS:0000000000000000 [869800.231137] CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033 [869800.232321] CR2: 0000558dc45e6a78 CR3: 0000000765b16004 CR4: 0000000000370ef0     [869800.233783] Call Trace: [869800.234330] <TASK> [869800.234791] read_extent_buffer+0x4d/0x100 [btrfs]     [869800.235898] btrfs_listxattr+0x199/0x240 [btrfs] [869800.236912] vfs_listxattr+0x51/0 ---truncated---     (CVE-2026-98959)

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Linux Distros Unpatched Vulnerability : CVE-2026-98959

critical Nessus Plugin ID 371464

Version 1.11