CVE-2024-37078: nilfs2: fix potential kernel bug due to lack of writeback flag waiting
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix potential kernel bug due to lack of writeback flag waiting
Destructive writes to a block device on which nilfs2 is mounted can cause a kernel bug in the folio/page writeback start routine or writeback end routine (foliostartwriteback in the log below):
kernel BUG at mm/page-writeback.c:3070! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI ... RIP: 0010:foliostartwriteback+0xbaa/0x10e0 Code: 25 ff 0f 00 00 0f 84 18 01 00 00 e8 40 ca c6 ff e9 17 f6 ff ff e8 36 ca c6 ff 4c 89 f7 48 c7 c6 80 c0 12 84 e8 e7 b3 0f 00 90 <0f> 0b e8 1f ca c6 ff 4c 89 f7 48 c7 c6 a0 c6 12 84 e8 d0 b3 0f 00 ... Call Trace: <TASK> nilfssegctordoconstruct+0x4654/0x69d0 [nilfs2] nilfssegctorconstruct+0x181/0x6b0 [nilfs2] nilfssegctorthread+0x548/0x11c0 [nilfs2] kthread+0x2f0/0x390 retfromfork+0x4b/0x80 retfromforkasm+0x1a/0x30 </TASK>
This is because when the log writer starts a writeback for segment summary blocks or a super root block that use the backing device's page cache, it does not wait for the ongoing folio/page writeback, resulting in an inconsistent writeback state.
Fix this issue by waiting for ongoing writebacks when putting folios/pages on the backing device into writeback state.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1 - Upgrade
Upgrade
debian/linux-6.1to a version that resolves this vulnerability.Fixed in 6.1.129-1~deb11u1
Event History
Frequently Asked Questions
What is the severity of CVE-2024-37078?
CVE-2024-37078 has a moderate severity rating due to its potential impact on kernel stability.
How do I fix CVE-2024-37078?
To fix CVE-2024-37078, update your Linux kernel to one of the patched versions: 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.11-1, or 6.12.12-1.
Which versions of Linux are affected by CVE-2024-37078?
CVE-2024-37078 affects specific versions of the Linux kernel including 5.10 and 6.1 series prior to the patched versions.
What components are impacted by CVE-2024-37078?
CVE-2024-37078 impacts the nilfs2 file system in the Linux kernel, specifically during writeback operations.
Can CVE-2024-37078 be exploited remotely?
CVE-2024-37078 is not classified as a remote exploit but can be triggered by destructive writes on affected block devices.