CVE-2026-74542: netfs: Fix folio_queue ENOMEM in writeback by adding a mempool
In the Linux kernel, the following vulnerability has been resolved:
netfs: Fix folioqueue ENOMEM in writeback by adding a mempool
Fix the handling of folioqueue allocation failure in writeback by adding a mempool and passing in gfpt flags to the rolling buffer functions that allocate memory, using the mempool if gfp != GFPKERNEL.
This is then extended upwards and the gfp to be used for a request is stored in the netfsiorequest struct and is then used for both requests and subrequests, eliminating the sleeping loops there.
The failure caused:
folio != NULL WARNING: fs/netfs/writeissue.c:603 at netfswritepages+0x883/0xa10 fs/netfs/writeissue.c:603, CPU#3: syz.0.17/5919
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-74542?
CVE-2026-74542 has a risk rating of 18, indicating a high severity level.
How do I fix CVE-2026-74542?
To fix CVE-2026-74542, update to the latest version of the Linux kernel where this vulnerability has been resolved.
What systems are affected by CVE-2026-74542?
CVE-2026-74542 affects the Linux kernel specifically in the netfs module.
What are the potential impacts of CVE-2026-74542?
CVE-2026-74542 can lead to memory allocation failures during writeback operations in the netfs module.
When was CVE-2026-74542 published?
CVE-2026-74542 was published on August 15, 2026.