CVE-2022-49699 filemap: Handle sibling entries in filemap_get_read_batch()

What is CVE-2022-49699?

CVE-2022-49699 is a medium-severity vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

filemap: Handle sibling entries in filemap_get_read_batch()

If a read races with an invalidation followed by another read, it is possible for a folio to be replaced with a higher-order folio. If that happens, we'll see a sibling entry for the new folio in the next iteration of the loop. This manifests as a NULL pointer dereference while holding the RCU read lock.

Handle this by simply returning. The next call will find the new folio and handle it correctly. The other ways of handling this rare race are more complex and it's just not worth it.

Weakness: CWE-476

Which versions are affected by CVE-2022-49699?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-49699?

Apply the vendor's patch.

Is CVE-2022-49699 being exploited?

There is no known exploitation of CVE-2022-49699 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-68802, DEBIAN-CVE-2022-49699, GHSA-rqcf-mx7p-prjx, ROOT-OS-UBUNTU-2204-CVE-2022-49699, UBUNTU-CVE-2022-49699.