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CVE-2026-98960

Linux: btrfs: don't stash io_uring encoded data across -EAGAIN

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83eAlso 51562a8cb11628d3a5e105b4c347ec5473e5745fCVE List
Published23 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83eLinuxCVE List
  • 51562a8cb11628d3a5e105b4c347ec5473e5745fLinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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

btrfs: don't stash io_uring encoded data across -EAGAIN

Returning -EAGAIN while leaving btrfs_uring_encoded_data in the cmd PDU leaks if the request is cancelled or the ring exits before reissue. io_uring does not free driver PDU allocations on cleanup.

Write: io_queue_sqe() always issues with IO_URING_F_NONBLOCK first, so return -EAGAIN before allocating and free data on every exit.

Read: free on nowait -EAGAIN too; only -EIOCBQUEUED keeps the allocation for btrfs_uring_read_finished().

Text from CVE List

Affected versions 6

  • Linuxaffected: 34310c442e175f286b4c06ab5caa4e0b267ea31c before 4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83eCVE List
  • Linuxaffected: 34310c442e175f286b4c06ab5caa4e0b267ea31c before 51562a8cb11628d3a5e105b4c347ec5473e5745fCVE List
  • Linuxaffected: 6.13CVE List
  • Linuxunaffected: all versions before 6.13CVE List
  • Linuxunaffected: 7.2.11 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 2