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CVE-2026-89502— ring-buffer: Free cpu_buffer::free_page with subbuf_order

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： 环形缓冲区：使用 subbuf_order 释放 cpu_buffer::free_page 当子缓冲区使用的页序数（order）大于 0 时， 是以 分配的。修复方式是使用正确的页序数来分配 。

AI Predicted 7.8 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux f9b94daa542a8d2532f0930f01cd9aec2d19621b< 77275ccea06eaf297e8e6ac3fc830cb72086379a affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 8c1ecdcdea738efe0494af908f12c0ae3a97fffa affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e affected
f9b94daa542a8d2532f0930f01cd9aec2d19621b< 234b1a72e9706fe20c08c96f4374ec8e83b934cb affected
6.8 affected
< 6.8 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89502

Vulnerability Information
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Vulnerability Title
ring-buffer: Free cpu_buffer::free_page with subbuf_order
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Free cpu_buffer::free_page with subbuf_order When sub-buffers use an order greater than 0, cpu_buffer->free_page is allocated with subbuf_order. Use the correct order for cpu_buffer->free_page.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f9b94daa542a8d2532f0930f01cd9aec2d19621b ~ 77275ccea06eaf297e8e6ac3fc830cb72086379a -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-89502

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III. Intelligence Information for CVE-2026-89502

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Patches & Fixes for CVE-2026-89502 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-89502

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