CVE-2024-56619: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()
First published: Fri Dec 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() Syzbot reported that when searching for records in a directory where the inode's i_size is corrupted and has a large value, memory access outside the folio/page range may occur, or a use-after-free bug may be detected if KASAN is enabled. This is because nilfs_last_byte(), which is called by nilfs_find_entry() and others to calculate the number of valid bytes of directory data in a page from i_size and the page index, loses the upper 32 bits of the 64-bit size information due to an inappropriate type of local variable to which the i_size value is assigned. This caused a large byte offset value due to underflow in the end address calculation in the calling nilfs_find_entry(), resulting in memory access that exceeds the folio/page size. Fix this issue by changing the type of the local variable causing the bit loss from "unsigned int" to "u64". The return value of nilfs_last_byte() is also of type "unsigned int", but it is truncated so as not to exceed PAGE_SIZE and no bit loss occurs, so no change is required.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=2.6.30<5.4.287 | |
| Linux Kernel | >=5.5<5.10.231 | |
| Linux Kernel | >=5.11<5.15.174 | |
| Linux Kernel | >=5.16<6.1.120 | |
| Linux Kernel | >=6.2<=6.6.66 | |
| Linux Kernel | >=6.7<=6.12.5 | |
| Linux Kernel | =6.13-rc1 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3
- https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0
- https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951
- https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57
- https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f
- https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e
- https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56619
- https://nvd.nist.gov/vuln/detail/CVE-2024-56619
- https://launchpad.net/bugs/cve/CVE-2024-56619
- https://security-tracker.debian.org/tracker/CVE-2024-56619
- https://ubuntu.com/security/CVE-2024-56619
- https://git.kernel.org/linus/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d
Frequently Asked Questions
What is the severity of CVE-2024-56619?
CVE-2024-56619 is classified as a high severity vulnerability due to potential out-of-bounds memory access.
How do I fix CVE-2024-56619?
To fix CVE-2024-56619, update the Linux kernel to the latest version that includes the patch addressing this vulnerability.
What are the potential impacts of CVE-2024-56619?
CVE-2024-56619 can lead to system crashes or unauthorized memory access, affecting system stability and security.
Which versions of the Linux kernel are affected by CVE-2024-56619?
CVE-2024-56619 affects various versions of the Linux kernel that utilize nilfs2 file systems.
How can I determine if my system is vulnerable to CVE-2024-56619?
Check if your current Linux kernel version is prior to the patches that resolve CVE-2024-56619 to assess vulnerability.
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