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CVE-2026-45948— ext4: fix memory leak in ext4_ext_shift_extents()

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ext4_ext_shift_extents()函数在while循环中遇到空extent时未释放路径，可能导致内存泄漏。

AI Predicted 5.5 Difficulty: Easy EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a18ed359bdddcded4f97ff5e2f07793ff9336913< 7e807cb8603b7664fa630a696cd891d9a03c248d affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< afc5e61e1a07b2b833bd72cbee36ecce9cd901e2 affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< 1bce219ee5512cf179ba40cf114945a14a16e21f affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< 4a79fde8db7eba7f1128d971ceba4e3c9ac84aec affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< 2f4b1052246ca646bb17bfe0f53df2fdf9729b58 affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< 12615ab4bfb69678e5d961b28bb70040299e51b1 affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< bd7b52557e4a3ccd7595fdb3a585f1257de57935 affected
a18ed359bdddcded4f97ff5e2f07793ff9336913< ca81109d4a8f192dc1cbad4a1ee25246363c2833 affected
… +10 more rows
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I. Basic Information for CVE-2026-45948

Vulnerability Information
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Vulnerability Title
ext4: fix memory leak in ext4_ext_shift_extents()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leak in ext4_ext_shift_extents() In ext4_ext_shift_extents(), if the extent is NULL in the while loop, the function returns immediately without releasing the path obtained via ext4_find_extent(), leading to a memory leak. Fix this by jumping to the out label to ensure the path is properly released.
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ext4_ext_shift_extents()函数在while循环中遇到空extent时未释放路径，可能导致内存泄漏。
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 a18ed359bdddcded4f97ff5e2f07793ff9336913 ~ 7e807cb8603b7664fa630a696cd891d9a03c248d -
Linux Linux 3.15 -

II. Public POCs for CVE-2026-45948

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III. Intelligence Information for CVE-2026-45948

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Patches & Fixes for CVE-2026-45948 (8)

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

CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
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-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
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-2026-46037 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-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
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-2026-45931 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-2026-46065 7.8 HIGH fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info
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-2026-45909 7.8 HIGH clk: mediatek: Drop __initconst from gates

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-2026-45948

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