CVE-2026-89486— ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
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，修复了以下漏洞： ipmi: 修复 中 的释放后使用（use-after-free）问题 提交 9e91f8a6c868（"ipmi:msghandler: 从 ipmi_interfaces 列表中移除 srcu"）在将命令接收器（command receivers）从 中解链和释放它们之间，移除了 调用，仅更新了说明该屏障必要性的注释。 列表仍是在普通 RCU（read-copy update）保护下被遍历的： 在 内部遍历该列表，而 则在同一个读取侧代码段内通过该查找借用 。由于缺少宽
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 9e91f8a6c8688e27f4ccce7db457da87d6458836< 3088e41292fecf132f85f79af5ee4d620b9ff1b4 |
affected |
9e91f8a6c8688e27f4ccce7db457da87d6458836< 5dc0b2a9af95a97861c1bffaf1687a3173e395c5 |
affected | ||
9e91f8a6c8688e27f4ccce7db457da87d6458836< 05ec76cfbce653e07cec19b9b8b20e33449d5d87 |
affected | ||
6.16 |
affected | ||
< 6.16 |
unaffected | ||
6.18.50≤ 6.18.* |
unaffected | ||
7.2.4≤ 7.2.* |
unaffected | ||
7.3-rc1≤ * |
unaffected |
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I. Basic Information for CVE-2026-89486
Vulnerability Information
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Vulnerability Title
ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
Commit 9e91f8a6c868 ("ipmi:msghandler: Remove srcu for the
ipmi_interfaces list") dropped the synchronize_rcu() between unlinking
the command receivers from intf->cmd_rcvrs and freeing them, updating
only the comment that explains why the barrier is needed.
The cmd_rcvrs list is still traversed under plain RCU: find_cmd_rcvr()
walks it inside rcu_read_lock(), and handle_ipmb_get_msg_cmd() borrows
rcvr->user from that lookup within the same read-side section. Without
the grace period, _ipmi_destroy_user() can kfree() a cmd_rcvr while a
reader still holds a pointer to it, causing a use-after-free.
The rework only made srcu unnecessary for the interfaces list; the
cmd_rcvrs list still relies on plain RCU. Restore the synchronize_rcu()
before freeing the receivers.
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-2026-89486
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-89486 (3)
Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total
| CVE-2026-89490 | ocfs2: fix readdir position truncation on 32-bit kernels | |
| 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-2026-89487 | 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-2026-89491 | ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin() | |
| CVE-2026-89501 | ring-buffer: Hold cpu_buffer::lock when resizing a subbuf | |
| 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-2026-89500 | 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-2026-89502 | 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-2026-89486
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