Bug 2481964 (CVE-2026-45948)

Summary: CVE-2026-45948 kernel: ext4: fix memory leak in ext4_ext_shift_extents()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's ext4 filesystem. This vulnerability occurs in the `ext4_ext_shift_extents()` function, where a memory leak can happen if the function returns prematurely without releasing a previously obtained path. A local attacker could potentially exploit this to cause a denial of service due to resource exhaustion.
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Description OSIDB Bzimport 2026-05-27 15:04:36 UTC 
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.
Comment 1 Keith Grant 2026-05-27 23:52:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052731-CVE-2026-45948-ea2b@gregkh/T