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CVE-2026-97415— btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF

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.

在 Linux 内核中，已修复以下漏洞： btrfs：tree-checker：验证 ROOT_REF 和 ROOT_BACKREF 中的名称字段 ROOT_REF 和 ROOT_BACKREF 项包含一个 结构体，其后跟随子卷名称。多个读取器假设这种内存布局本身是有效的，并直接使用磁盘上存储的名称长度（ ）。因此，损坏的项可能导致这些读取器访问超出项边界之外的字节，并使得 ioctl 向固定的用户空间应用程序接口（UAPI）名称缓冲区复制过多字节。 在进行任何读取操作之前，先在 tree-checker 中对 R

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux b64ec075bded2b30bcd90af5aa5256d2237c885d< 1370badf6b823ce3cde39a65f46f9e5dc7b4bf43 affected
b64ec075bded2b30bcd90af5aa5256d2237c885d< ba6c4fc662853f6662e4db060cf88ee994053e21 affected
b64ec075bded2b30bcd90af5aa5256d2237c885d< 9154542070ca7eadb3c764a882f39a127677854b affected
b64ec075bded2b30bcd90af5aa5256d2237c885d< 74f577c722c99248d804eca18e7de7c5e47549d7 affected
b64ec075bded2b30bcd90af5aa5256d2237c885d< 0af37c217edf15fa21dac1c40822086df356c6bb affected
4.18 affected
< 4.18 unaffected
6.1.189≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-97415

Vulnerability Information
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Vulnerability Title
btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: tree-checker: validate names in ROOT_REF and ROOT_BACKREF ROOT_REF and ROOT_BACKREF items contain a struct btrfs_root_ref followed by the subvolume name. Several readers assume that this layout is already valid and then use the on-disk name length directly. A corrupted item can therefore make those readers address bytes outside the item, and BTRFS_IOC_GET_SUBVOL_INFO can copy too many bytes into its fixed-size UAPI name buffer. Validate ROOT_REF and ROOT_BACKREF items in tree-checker before any reader uses them. Reject records that do not contain a non-empty name, whose name_len does not exactly describe the remaining item payload, or whose name exceeds BTRFS_NAME_LEN. For BTRFS_IOC_GET_SUBVOL_INFO, copy only the validated on-disk name_len instead of deriving the copy length from the item size. The ioctl result is zeroed when allocated. That leaves the existing trailing zero byte untouched.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b64ec075bded2b30bcd90af5aa5256d2237c885d ~ 1370badf6b823ce3cde39a65f46f9e5dc7b4bf43 -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-97415

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III. Intelligence Information for CVE-2026-97415

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Patches & Fixes for CVE-2026-97415 (5)

Same Patch Batch · Linux · 2026-09-24 · 234 CVEs total

CVE-2026-93207 9.8 CRITICAL SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
CVE-2026-97413 9.8 CRITICAL RDMA/rtrs-srv: Fix integer underflow in process_read and process_write
CVE-2026-93228 9.1 CRITICAL svcrdma: Reject Write/Reply chunks with segcount 0
CVE-2026-93799 8.8 HIGH wifi: iwlwifi: mvm: validate sta_id in BA window status notif
CVE-2026-97442 8.8 HIGH wifi: ath11k: fix invalid data access in ath11k_dp_rx_h_undecap_nwifi
CVE-2026-97409 8.8 HIGH nvme-fc: Do not cancel requests in io target before it is initialized
CVE-2026-93806 8.8 HIGH wifi: cfg80211: validate assoc response length before status and IE access
CVE-2026-93793 8.8 HIGH wifi: iwlwifi: mvm: validate TX_CMD response layout
CVE-2026-93790 8.8 HIGH wifi: iwlwifi: mvm: fix out-of-bounds tid_data access in BA notif
CVE-2026-93284 8.8 HIGH drm/pagemap: dma-unmap pages before handling migration errors
CVE-2026-93280 8.8 HIGH greybus: audio: bound the topology section sizes against the fetched size
CVE-2026-97509 8.8 HIGH thunderbolt: Keep XDomain reference during the lifetime of a service
CVE-2026-93827 8.4 HIGH virtio-fs: avoid double-free on failed queue setup
CVE-2026-97452 8.4 HIGH ACPICA: Prevent adding invalid references
CVE-2026-97451 8.4 HIGH ACPICA: Fix integer overflow in acpi_ex_opcode_3A_1T_1R() (mid_op)
CVE-2026-97450 8.4 HIGH ACPICA: validate handler object type in two places
CVE-2026-97455 8.4 HIGH ACPICA: Fix use-after-free in acpi_ds_terminate_control_method()
CVE-2026-97433 8.2 HIGH nvme: validate FDP configuration descriptor sizes
CVE-2026-93787 8.1 HIGH smb: client: bound dirent name against end of SMB response in cifs_filldir
CVE-2026-93786 8.1 HIGH ksmbd: preserve VFS inherited POSIX ACL mask

Showing top 20 of 234 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97415

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