CVE-2026-89500— ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
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：将 改为 在并发执行环形缓冲区调整大小（resize）之后，释放缓存的读端（reader）页时， 调用会使用新的全局 。由于缓存页是在旧尺寸下分配的，这种顺序不匹配可能导致内核崩溃或内存泄漏。 修复方式： 将与页地址一同保存实际的 顺序（order），以确保始终引用正确的值，而不依赖可能已经过期的 值。最简单的实现是将 替换为 ，该结构体恰好包含我们所需的两个字段：页地址和页顺序（page order）。
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 8e7b58c27b3c567316a51079b375b846f9223bba< a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 |
affected |
8e7b58c27b3c567316a51079b375b846f9223bba< d787d509bdf6c88c85e095247daf7456cb7fb772 |
affected | ||
8e7b58c27b3c567316a51079b375b846f9223bba< 7a1fb95de5404134f8758c1295ce88986bdf117c |
affected | ||
6.8 |
affected | ||
< 6.8 |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
7.2.4≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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I. Basic Information for CVE-2026-89500
Vulnerability Information
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Vulnerability Title
ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
Discarding a cached reader page after a concurrent ring buffer resize
uses the new global subbuf_order for the free_pages() call. This
mismatched order may crashes the kernel or leaks memory because the cached
page was allocated under the old size.
Save the actual free_page order alongside the page address to ensure we
always refer to the correct value and do not rely on the potentially
stalled cpu_buffer->subbuf_order value. The simplest is to make
free_page a buffer_data_read_page which already covers exactly what we
need: a page address and a page order.
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
II. Public POCs for CVE-2026-89500
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-89500 (3)
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-2026-89501 | ring-buffer: Hold cpu_buffer::lock when resizing a subbuf | |
| 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-2026-89502 | ring-buffer: Free cpu_buffer::free_page with subbuf_order |
Showing top 20 of 431 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
Same vendor: Linux
-
CVE-2026-89773
drm/amd/display: Skip Update HDCP Config In Transition State -
CVE-2026-89772
btrfs: write-protect folios during data writeback -
CVE-2026-89771
ring-buffer: Fix subbuf resize race with ring buffer readers -
CVE-2026-89770
iomap: don't free integrity payload that doesn't exist -
CVE-2026-89769
clocksource/drivers/nxp-pit: Fix IRQ leak on cpuhp_setup_sta
V. Comments for CVE-2026-89500
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