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CVE-2026-45974— btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found

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，该漏洞源于在btrfs_quota_enable中未找到引用键时访问无效叶子节点，可能导致无效路径访问。

AI Predicted 5.5 Difficulty: Hard EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 5223cc60b40ae525ae6c94e98824129f1a5b4ae5< 023545e272f369d487e6a986c1e321c6e04be1da affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< fd4913a53e3b54ad7e161847291439fe445d6356 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< b5b8ade9da452086e78f5d519b90d3769e354853 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< 1ee1d006c9fe4d6be5527ab1c84216b80cccbe40 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< 0761447f6f51e1c7997960d8e6559337deed6729 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< d7cf2314dd5e8661c05d076cd627eea9a7f76616 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< b2bd557b75b760e4b9d209112bda19314bd64558 affected
5223cc60b40ae525ae6c94e98824129f1a5b4ae5< ecb7c2484cfc83a93658907580035a8adf1e0a92 affected
… +12 more rows
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I. Basic Information for CVE-2026-45974

Vulnerability Information
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Vulnerability Title
btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid leaf access in btrfs_quota_enable() if ref key not found If btrfs_search_slot_for_read() returns 1, it means we did not find any key greater than or equals to the key we asked for, meaning we have reached the end of the tree and therefore the path is not valid. If this happens we need to break out of the loop and stop, instead of continuing and accessing an invalid path.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于在btrfs_quota_enable中未找到引用键时访问无效叶子节点，可能导致无效路径访问。
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 5223cc60b40ae525ae6c94e98824129f1a5b4ae5 ~ 023545e272f369d487e6a986c1e321c6e04be1da -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-45974

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III. Intelligence Information for CVE-2026-45974

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Patches & Fixes for CVE-2026-45974 (7)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45951 7.8 HIGH bpf: Fix a potential use-after-free of BTF object
CVE-2026-45931 7.8 HIGH accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
CVE-2026-45878 7.8 HIGH drm/amdkfd: Fix watch_id bounds checking in debug address watch v2
CVE-2026-46036 7.8 HIGH vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45959 7.8 HIGH crypto: ccp - Fix a crash due to incorrect cleanup usage of kfree
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45974

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