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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-17
• Weakness: CWE-401

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.

Affected products

• Linux kernel: from 3.15.1 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.14 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.14, 6.19.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/12615ab4bfb69678e5d961b28bb70040299e51b1
• https://git.kernel.org/stable/c/1bce219ee5512cf179ba40cf114945a14a16e21f
• https://git.kernel.org/stable/c/2f4b1052246ca646bb17bfe0f53df2fdf9729b58
• https://git.kernel.org/stable/c/4a79fde8db7eba7f1128d971ceba4e3c9ac84aec
• https://git.kernel.org/stable/c/7e807cb8603b7664fa630a696cd891d9a03c248d
• https://git.kernel.org/stable/c/afc5e61e1a07b2b833bd72cbee36ecce9cd901e2
• https://git.kernel.org/stable/c/bd7b52557e4a3ccd7595fdb3a585f1257de57935
• https://git.kernel.org/stable/c/ca81109d4a8f192dc1cbad4a1ee25246363c2833

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