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CVE-2023-52566

Disclosure Date: March 02, 2024 •
CVE-2023-52566
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Description

In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix potential use after free in nilfs_gccache_submit_read_data()

In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the
reference count of bh when the call to nilfs_dat_translate() fails. If
the reference count hits 0 and its owner page gets unlocked, bh may be
freed. However, bh->b_page is dereferenced to put the page after that,
which may result in a use-after-free bug. This patch moves the release
operation after unlocking and putting the page.

NOTE: The function in question is only called in GC, and in combination
with current userland tools, address translation using DAT does not occur
in that function, so the code path that causes this issue will not be
executed. However, it is possible to run that code path by intentionally
modifying the userland GC library or by calling the GC ioctl directly.

[konishi.ryusuke@gmail.com: NOTE added to the commit log]

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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Utility Class
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Ports
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OS
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Vulnerable Versions
Linux fb1084e63ee5
Linux not down converted
Prerequisites
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Discovered By
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis