Riskcovery

CVE-2026-74634

ring-buffer: Prevent subbuf order change when resizing is disabled

State
Published
Severity
7.8 High
Published
Aug 22, 2026
Updated
Aug 25, 2026
Reserved
Aug 15, 2026

Read the record on cve.org

Description

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

ring-buffer: Prevent subbuf order change when resizing is disabled

Because ring_buffer_subbuf_order_set() frees buffer pages, we can't allow it when resizing is disabled. A non-consuming reader is at risk of use-after-free (rb_advance_iter()).

Return -EBUSY on resize_disabled, matching ring_buffer_resize() behaviour.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • f9b94daa542a8d2532f0930f01cd9aec2d19621b to before b45b91db41379ee5fb36c187d6d7c37b725cbe8eAffected
  • f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 62978cf6347972c04130e4e841ba404504d92b32Affected
  • f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 7568e9e717e7540bd05bcc007f5d76fcaff3cdffAffected
  • f9b94daa542a8d2532f0930f01cd9aec2d19621b to before bf98d7b0d5a99991e47e66cee4eb1d3fa514be97Affected
LinuxLinux
  • 6.8Affected
  • before 6.8Not affected
  • 6.12.104 through 6.12.*Not affected
  • 6.18.45 through 6.18.*Not affected
  • 7.1.9 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.