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CVE-2025-40205— btrfs: avoid potential out-of-bounds in btrfs_encode_fh()

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，该漏洞源于文件句柄编码越界写入，可能导致内存损坏。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux be6e8dc0ba84029997075a1ec77b4ddb863cbe15< 60de2f55d2aca53e81b4ef2a67d7cc9e1eb677db affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< 742b44342204e5dfe3926433823623c1a0c581df affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< d3a9a8e1275eb9b87f006b5562a287aea3f6885f affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< d91f6626133698362bba08fbc04bd72c466806d3 affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< 0276c8582488022f057b4cec21975a5edf079f47 affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< 361d67276eb8ec6be8f27f4ad6c6090459438fee affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< 43143776b0a7604d873d1a6f3e552a00aa930224 affected
be6e8dc0ba84029997075a1ec77b4ddb863cbe15< dff4f9ff5d7f289e4545cc936362e01ed3252742 affected
… +10 more rows
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I. Basic Information for CVE-2025-40205

Vulnerability Information
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Vulnerability Title
btrfs: avoid potential out-of-bounds in btrfs_encode_fh()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: avoid potential out-of-bounds in btrfs_encode_fh() The function btrfs_encode_fh() does not properly account for the three cases it handles. Before writing to the file handle (fh), the function only returns to the user BTRFS_FID_SIZE_NON_CONNECTABLE (5 dwords, 20 bytes) or BTRFS_FID_SIZE_CONNECTABLE (8 dwords, 32 bytes). However, when a parent exists and the root ID of the parent and the inode are different, the function writes BTRFS_FID_SIZE_CONNECTABLE_ROOT (10 dwords, 40 bytes). If *max_len is not large enough, this write goes out of bounds because BTRFS_FID_SIZE_CONNECTABLE_ROOT is greater than BTRFS_FID_SIZE_CONNECTABLE originally returned. This results in an 8-byte out-of-bounds write at fid->parent_root_objectid = parent_root_id. A previous attempt to fix this issue was made but was lost. https://lore.kernel.org/all/4CADAEEC020000780001B32C@vpn.id2.novell.com/ Although this issue does not seem to be easily triggerable, it is a potential memory corruption bug that should be fixed. This patch resolves the issue by ensuring the function returns the appropriate size for all three cases and validates that *max_len is large enough before writing any data.
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
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，该漏洞源于文件句柄编码越界写入，可能导致内存损坏。
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 be6e8dc0ba84029997075a1ec77b4ddb863cbe15 ~ 60de2f55d2aca53e81b4ef2a67d7cc9e1eb677db -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2025-40205

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III. Intelligence Information for CVE-2025-40205

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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

CVE-2025-40176 9.8 CRITICAL tls: wait for pending async decryptions if tls_strp_msg_hold fails
CVE-2025-40140 8.8 HIGH net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast
CVE-2025-40204 8.1 HIGH sctp: Fix MAC comparison to be constant-time
CVE-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
CVE-2025-40186 8.1 HIGH tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
CVE-2025-40168 8.1 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().
CVE-2025-40133 8.1 HIGH mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
CVE-2025-40141 8.0 HIGH Bluetooth: ISO: Fix possible UAF on iso_conn_free
CVE-2025-40198 7.8 HIGH ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40203 7.8 HIGH listmount: don't call path_put() under namespace semaphore
CVE-2025-40201 7.8 HIGH kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
CVE-2025-40199 7.8 HIGH page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches
CVE-2025-40165 7.8 HIGH media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40166 7.8 HIGH drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs
CVE-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

Showing top 20 of 96 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40205

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