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CVE-2024-27058
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MITRE ATT&CK
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Defense Evasion
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Exfiltration
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Lateral Movement
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Privilege Escalation
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Description
In the Linux kernel, the following vulnerability has been resolved:
tmpfs: fix race on handling dquot rbtree
A syzkaller reproducer found a race while attempting to remove dquot
information from the rb tree.
Fetching the rb_tree root node must also be protected by the
dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot()
will trigger a warning because it couldn’t find a node in the tree, when
the real reason was the root node changing before the search starts:
Thread 1 Thread 2
shmem_releasedquot() – shmem{acquire,release}_dquot()
fetch ROOT – Fetch ROOT
- acquire dqio_semwait dqio_sem
- do something, triger a tree rebalance - release dqio_semacquire dqio_sem
start searching for the node, but
from the wrong location, missing
the node, and triggering a warning.
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- Linux
Products
- Linux
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