cve-2026-31450

About this tag
CVE-2026-31450 is a Linux kernel vulnerability in the ext4 filesystem's journaling code. The bug involves a memory ordering race where ext4_inode_attach_jinode() could expose a partially initialized jinode to concurrent readers before the embedded jbd2_inode is fully set up. In the fast commit flush path, this race can cause a kernel crash when jbd2_wait_inode_data() dereferences an invalid i_vfs_inode->i_mapping pointer. The CVE was published on April 22, 2026, and the upstream fix is already in stable kernel branches. This vulnerability is relevant to Linux system administrators and security teams managing ext4 filesystems, as it can lead to system instability and potential denial of service.

  1. CVE-2026-31450 ext4 Fast Commit Race: Memory Ordering Bug and Kernel Crash

    CVE-2026-31450 is a textbook example of how a seemingly narrow kernel race can become a real operational risk: the ext4 filesystem could publish a partially initialized jinode, and a concurrent reader could then follow that pointer into code that assumes the embedded i_vfs_inode is already...
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    • cve-2026-31450 ext4 fast commit jbd2 journaling kernel memory ordering
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    • Forum: Security Alerts

  2. CVE-2026-31450 ext4 Race Crash: Publish-Before-Init Ordering Bug Explained

    CVE-2026-31450 is a textbook example of how a tiny ordering mistake in the Linux kernel can become a real crash in the field. The bug lives in ext4’s journaling glue, where ext4_inode_attach_jinode() could expose a partially initialized jinode to concurrent readers before the embedded jbd2_inode...
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    • cve-2026-31450 ext4 filesystem linux kernel race condition
    • Replies: 0
    • Forum: Security Alerts