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CVE-2026-43117— btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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_sync_file事件中通过dentry获取超级块时未考虑overlay文件系统，可能导致崩溃。

CVSS 9.1 · Critical EPSS 0.46% · P38

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux bc074524e123ded281cde25ebc5661910f9679e3< 4a7bab35fad5251c8cb738161152578cd83b6b9c affected
bc074524e123ded281cde25ebc5661910f9679e3< 520e8b4bcf872a534a7bf61ccf880047642df296 affected
bc074524e123ded281cde25ebc5661910f9679e3< e252db8ca2a01f82d472091f35d549b313278636 affected
bc074524e123ded281cde25ebc5661910f9679e3< c09a7446aab5773f38d6abb25fce99b8e1dfbc97 affected
bc074524e123ded281cde25ebc5661910f9679e3< 32372781d664a9b03c40343e96c29d0a6139f97d affected
bc074524e123ded281cde25ebc5661910f9679e3< 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a affected
bc074524e123ded281cde25ebc5661910f9679e3< d110d7cdb045715c0b45b0dfd974525bb38f653d affected
bc074524e123ded281cde25ebc5661910f9679e3< a85b46db143fda5869e7d8df8f258ccef5fa1719 affected
… +10 more rows
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I. Basic Information for CVE-2026-43117

Vulnerability Information
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Vulnerability Title
btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file() If overlay is used on top of btrfs, dentry->d_sb translates to overlay's super block and fsid assignment will lead to a crash. Use file_inode(file)->i_sb to always get btrfs_sb.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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_sync_file事件中通过dentry获取超级块时未考虑overlay文件系统，可能导致崩溃。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux bc074524e123ded281cde25ebc5661910f9679e3 ~ 4a7bab35fad5251c8cb738161152578cd83b6b9c -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-43117

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III. Intelligence Information for CVE-2026-43117

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Patches & Fixes for CVE-2026-43117 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-43208 9.8 CRITICAL net: do not pass flow_id to set_rps_cpu()
CVE-2026-43198 9.8 CRITICAL tcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-43125 9.8 CRITICAL dlm: validate length in dlm_search_rsb_tree
CVE-2026-43185 9.8 CRITICAL ksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-43186 9.8 CRITICAL ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-43114 9.4 CRITICAL netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-43197 9.1 CRITICAL netconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-43083 9.1 CRITICAL net: ioam6: fix OOB and missing lock
CVE-2026-43172 8.8 HIGH wifi: iwlwifi: fix 22000 series SMEM parsing
CVE-2026-43283 8.8 HIGH net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-43176 8.8 HIGH wifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-43113 8.8 HIGH wifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-43112 8.8 HIGH fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-43215 8.8 HIGH cifs: Fix locking usage for tcon fields
CVE-2026-43249 8.8 HIGH 9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-43239 8.8 HIGH smb: client: prevent races in ->query_interfaces()
CVE-2026-43110 8.8 HIGH wifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-43232 8.8 HIGH net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-43187 8.8 HIGH xfs: delete attr leaf freemap entries when empty
CVE-2026-43158 8.8 HIGH xfs: fix freemap adjustments when adding xattrs to leaf blocks

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43117

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