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CVE-2025-37856 The advisory has been revoked - it doesn't affect any version of package linux-virt  (opens in a new tab)

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EPSS
0.31% (24th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-LINUXVIRT-13961768
  • published14 Nov 2025
  • disclosed9 May 2025
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Introduced: 9 May 2025

CVE-2025-37856  (opens in a new tab)

Amendment

The Minimos security team deemed this advisory irrelevant for Minimos:latest.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-virt package and not the linux-virt package as distributed by Minimos.

In the Linux kernel, the following vulnerability has been resolved:

btrfs: harden block_group::bg_list against list_del() races

As far as I can tell, these calls of list_del_init() on bg_list cannot run concurrently with btrfs_mark_bg_unused() or btrfs_mark_bg_to_reclaim(), as they are in transaction error paths and situations where the block group is readonly.

However, if there is any chance at all of racing with mark_bg_unused(), or a different future user of bg_list, better to be safe than sorry.

Otherwise we risk the following interleaving (bg_list refcount in parens)

T1 (some random op) T2 (btrfs_mark_bg_unused) !list_empty(&bg->bg_list); (1) list_del_init(&bg->bg_list); (1) list_move_tail (1) btrfs_put_block_group (0) btrfs_delete_unused_bgs bg = list_first_entry list_del_init(&bg->bg_list); btrfs_put_block_group(bg); (-1)

Ultimately, this results in a broken ref count that hits zero one deref early and the real final deref underflows the refcount, resulting in a WARNING.