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

  - btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol() If during relocation we fail     in insert_dirty_subvol() because btrfs_update_reloc_root() returned an error, we will leave a root's     reloc_root field pointing to a reloc root that was freed instead of NULL, resulting later in a use-after-     free, or double free attempt during unmount. The sequence of steps is this: 1) During relocation the call     to btrfs_update_reloc_root() in insert_dirty_subvol() fails, so insert_dirty_subvol() returns the error to     merge_reloc_root() without adding the root to the list rc->dirty_subvol_roots; 2) Then merge_reloc_root()     aborts the current transaction because insert_dirty_subvol() returned an error; 3) Up the call chain,     merge_reloc_roots() gets the error, adds the reloc root for root X to the local reloc_roots list and jumps     to the 'out' label, where it calls free_reloc_roots() to free all the reloc roots in the local reloc_roots     list. This frees the reloc root for root X; 4) We go up the call chain to relocate_block_group() which     calls clean_dirty_subvols() to go over dirty roots and set their ->reloc_root field to NULL, but root X is     not in the dirty_subvol_roots list, so its ->reloc_root still points to a reloc root; 5) Relocation     finishes, with an error and a transaction abort, but the ->reloc_root field for root X still points to the     reloc root that was freed in step 3; 6) When unmounting the fs we end up calling: btrfs_free_fs_roots()     btrfs_drop_and_free_fs_root() --> calls btrfs_put_root() against root X's ->reloc_root which is not NULL     and points to the already freed reloc root in step 4 above Resulting in a use-after-free to a double free     attempt. Syzbot reported this with the following dmesg/syslog: [ 106.004389][ T5339] BTRFS error (device     loop0 state A): Transaction aborted (error -5) [ 106.014266][ T5339] BTRFS: error (device loop0 state A)     in merge_reloc_root:1655: errno=-5 IO failure [ 106.021891][ T1061] BTRFS error (device loop0 state A):
    error while writing out transaction: -5 [ 106.026964][ T1061] BTRFS warning (device loop0 state A):
    Skipping commit of aborted transaction. [ 106.033807][ T5340] BTRFS error (device loop0 state A): bdev     /dev/loop0 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0 [ 106.039265][ T1061] BTRFS: error (device loop0     state A) in cleanup_transaction:2067: errno=-5 IO failure [ 106.044382][ T5339] BTRFS info (device loop0     state EA): forced readonly [ 106.074329][ T5339] BTRFS: error (device loop0 state EA) in     merge_reloc_roots:1887: errno=-5 IO failure [ 106.081004][ T5356] BTRFS info (device loop0 state EA):
    scrub: started on devid 1 [ 106.085611][ T5339] BTRFS info (device loop0 state EA): balance: ended with     status: -30 [ 106.089517][ T5356] BTRFS info (device loop0 state EA): scrub: not finished on devid 1 with     status: -30 [ 106.662365][ T5338] BTRFS info (device loop0 state EA): last unmount of filesystem     3a375e4e-b156-4d76-a2ad-16e198ce1409 [ 106.682946][ T5338]     ================================================================== [ 106.686574][ T5338] BUG: KASAN: slab-     use-after-free in btrfs_put_root+0x2f/0x250 [ 106.690090][ T5338] Write of size 4 at addr ffff88803f978630     by task syz.0.0/5338 [ 106.693173][ T5338] [ 106.694279][ T5338] CPU: 0 UID: 0 PID: 5338 Comm: syz.0.0 Not     tainted syzkaller #0 PREEMPT(full) [ 106.694293][ T5338] Hardware name: QEMU Standard PC (Q35 + ICH9,     2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 106.694300][ T5338] Call Trace: [ 106.694308][ T5338]     <TASK> [ 106.694314][ T5338] dump_stack_lvl+0xe8/0x150 [ 106.694331][ T5338]     print_address_description+0x55/0x1e0 [ 106.694343][ T5338] ? btrfs_put_root+0x2f/0x250 [ 106.694358][     T5338] print_report+0x58/0x70 [ 106. ---truncated--- (CVE-2026-93800)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
351155	Debian dsa-6528 : ata-modules-6.12.111+deb13-armmp-di - security update	Nessus	Debian Local Security Checks	9/29/2026	9/29/2026	high
362907	Debian dla-4817 : ata-modules-6.12.107+deb12-armmp-di - security update	Nessus	Debian Local Security Checks	10/4/2026	10/4/2026	high
349802	Linux Distros Unpatched Vulnerability : CVE-2026-93800	Nessus	Misc.	9/24/2026	10/12/2026	high
364137	Oracle Linux 10 / 9 : Unbreakable Enterprise kernel (ELSA-2026-500374)	Nessus	Oracle Linux Local Security Checks	10/8/2026	10/8/2026	high
365209	Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-3193)	Nessus	Amazon Linux Local Security Checks	10/12/2026	10/12/2026	medium

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