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CVE-2024-26878

Disclosure Date: April 17, 2024 •
CVE-2024-26878
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Description

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

quota: Fix potential NULL pointer dereference

Below race may cause NULL pointer dereference

P1 P2
dquot_free_inode quota_off

				  drop_dquot_ref
				   remove_dquot_ref
				   dquots = i_dquot(inode)

dquots = i_dquot(inode)
srcu_read_lock
dquots[cnt]) != NULL (1)

				     dquots[type] = NULL (2)

spin_lock(&dquots[cnt]–>dq_dqb_lock) (3)
….

If dquot_free_inode(or other routines) checks inode’s quota pointers (1)
before quota_off sets it to NULL(2) and use it (3) after that, NULL pointer
dereference will be triggered.

So let’s fix it by using a temporary pointer to avoid this issue.

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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 8514899c1a4e
Linux not down converted
Prerequisites
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Metasploit Module
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Vendors

  • Linux

Products

  • Linux
Technical Analysis