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CVE-2025-37856— btrfs: harden block_group::bg_list against list_del() races

EPSS 0.05% · P16
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I. Basic Information for CVE-2025-37856

Vulnerability Information
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Vulnerability Title
btrfs: harden block_group::bg_list against list_del() races
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于btrfs块组列表操作存在竞争条件，可能导致列表操作异常。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux a9f189716cf15913c453299d72f69c51a9b0f86b ~ bf089c4d1141b27332c092b1dcca5022c415a3b6 -
LinuxLinux 6.5 -

II. Public POCs for CVE-2025-37856

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III. Intelligence Information for CVE-2025-37856

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Same Patch Batch · Linux · 2025-05-09 · 52 CVEs total

CVE-2025-37874net: ngbe: fix memory leak in ngbe_probe() error path
CVE-2025-37889ASoC: ops: Consistently treat platform_max as control value
CVE-2025-37888net/mlx5: Fix null-ptr-deref in mlx5_create_{inner_,}ttc_table()
CVE-2025-37883s390/sclp: Add check for get_zeroed_page()
CVE-2025-37886pds_core: make wait_context part of q_info
CVE-2025-37885KVM: x86: Reset IRTE to host control if *new* route isn't postable
CVE-2025-37884bpf: Fix deadlock between rcu_tasks_trace and event_mutex.
CVE-2025-37887pds_core: handle unsupported PDS_CORE_CMD_FW_CONTROL result
CVE-2025-37876netfs: Only create /proc/fs/netfs with CONFIG_PROC_FS
CVE-2025-37875igc: fix PTM cycle trigger logic
CVE-2025-37877iommu: Clear iommu-dma ops on cleanup
CVE-2025-37873eth: bnxt: fix missing ring index trim on error path
CVE-2025-37872net: txgbe: fix memory leak in txgbe_probe() error path
CVE-2025-37871nfsd: decrease sc_count directly if fail to queue dl_recall
CVE-2025-37870drm/amd/display: prevent hang on link training fail
CVE-2025-37869drm/xe: Use local fence in error path of xe_migrate_clear
CVE-2025-37868drm/xe/userptr: fix notifier vs folio deadlock
CVE-2025-37867RDMA/core: Silence oversized kvmalloc() warning
CVE-2025-37866mlxbf-bootctl: use sysfs_emit_at() in secure_boot_fuse_state_show()
CVE-2025-37865net: dsa: mv88e6xxx: fix -ENOENT when deleting VLANs and MST is unsupported

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37856

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