Riskcovery

CVE-2026-89503

ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()

State
Published
Severity
7.8 High
Published
Sep 11, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

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

ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()

ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again.

However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory.

Use bpage->order for the allocation to prevent this race.

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
  • bce761d757452ba5eb77e11fecc37a04b67494e7 to before 2313ff69bd237aad264a5913907f374f958335a2Affected
  • bce761d757452ba5eb77e11fecc37a04b67494e7 to before 2dc510957fe8fd098ab3c3147ebdf34d00cd2734Affected
  • bce761d757452ba5eb77e11fecc37a04b67494e7 to before 53106e9262a310ef2c9a9321168c03705940c678Affected
  • bce761d757452ba5eb77e11fecc37a04b67494e7 to before e743527c5bfdceda1095bc0a9e596e2aebb6a9c3Affected
LinuxLinux
  • 6.8Affected
  • before 6.8Not affected
  • 6.12.112 through 6.12.*Not affected
  • 6.18.50 through 6.18.*Not affected
  • 7.2.4 through 7.2.*Not affected
  • 7.3 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.