CVE-2024-53130: nilfs2: fix null-ptr-deref in block_dirty_buffer tracepoint
First published: Wed Dec 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix null-ptr-deref in block_dirty_buffer tracepoint When using the "block:block_dirty_buffer" tracepoint, mark_buffer_dirty() may cause a NULL pointer dereference, or a general protection fault when KASAN is enabled. This happens because, since the tracepoint was added in mark_buffer_dirty(), it references the dev_t member bh->b_bdev->bd_dev regardless of whether the buffer head has a pointer to a block_device structure. In the current implementation, nilfs_grab_buffer(), which grabs a buffer to read (or create) a block of metadata, including b-tree node blocks, does not set the block device, but instead does so only if the buffer is not in the "uptodate" state for each of its caller block reading functions. However, if the uptodate flag is set on a folio/page, and the buffer heads are detached from it by try_to_free_buffers(), and new buffer heads are then attached by create_empty_buffers(), the uptodate flag may be restored to each buffer without the block device being set to bh->b_bdev, and mark_buffer_dirty() may be called later in that state, resulting in the bug mentioned above. Fix this issue by making nilfs_grab_buffer() always set the block device of the super block structure to the buffer head, regardless of the state of the buffer's uptodate flag.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=3.9<6.1.119 | |
| Linux Kernel | >=6.6.0<6.6.63 | |
| Linux Kernel | >=6.11.0<6.11.10 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/7af3309c7a2ef26831a67125b11c34a7e01c1b2a
- https://git.kernel.org/stable/c/0ce59fb1c73fdd5b6028226aeb46259a0cdc0957
- https://git.kernel.org/stable/c/0a5014ad37c77ac6a2c525137c00a0e1724f6020
- https://git.kernel.org/stable/c/d904e4d845aafbcfd8a40c1df7d999f02f062be8
- https://git.kernel.org/stable/c/86b19031dbc79abc378dfae357f6ea33ebeb0c95
- https://git.kernel.org/stable/c/b0e4765740040c44039282057ecacd7435d1d2ba
- https://git.kernel.org/stable/c/ffc440a76a0f476a7e6ea838ec0dc8e9979944d1
- https://git.kernel.org/stable/c/2026559a6c4ce34db117d2db8f710fe2a9420d5a
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-53130
- https://nvd.nist.gov/vuln/detail/CVE-2024-53130
- https://launchpad.net/bugs/cve/CVE-2024-53130
- https://security-tracker.debian.org/tracker/CVE-2024-53130
- https://ubuntu.com/security/CVE-2024-53130
- https://git.kernel.org/linus/2026559a6c4ce34db117d2db8f710fe2a9420d5a
Frequently Asked Questions
What is the severity of CVE-2024-53130?
CVE-2024-53130 has a severity level classified as critical due to the potential for NULL pointer dereference leading to denial of service.
How do I fix CVE-2024-53130?
To fix CVE-2024-53130, update the Linux kernel to versions greater than 6.1.119, between 6.6.0 and 6.6.63, or between 6.11.0 and 6.11.10.
Which Linux kernel versions are affected by CVE-2024-53130?
CVE-2024-53130 affects Linux kernel versions from 3.9 up to 6.1.119, from 6.6.0 to 6.6.63, and from 6.11.0 to 6.11.10.
What components are involved in CVE-2024-53130?
CVE-2024-53130 involves the nilfs2 file system and the block_dirty_buffer tracepoint in the Linux kernel.
Is CVE-2024-53130 being actively exploited?
As of now, there is no public indication that CVE-2024-53130 is being actively exploited.
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