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CVE-2026-89721— phy: rockchip-samsung-dcphy: fix out-of-range max_register

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： phy: rockchip-samsung-dcphy: 修复 max_register 越界问题 PHY 寄存器块的大小为 64KB，寄存器步长为 4，因此最后一个可访问的寄存器位于偏移 0xfffc 处。然而， 被定义为 0x10000，超出了映射范围的最后一个寄存器。通过 regmap 的 debugfs 接口转储寄存器时，读取操作会越过 ioremapped 区域，导致在未映射的页上发生内核崩溃（oops）。由于崩溃发生在持有 regmap 锁的情况下，后续对

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b< 14afe18655c0951f4f85898f761bf92264e65ccd affected
b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b< c1a62f9dcf531d56c56da2e4435386b6d264c69f affected
b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b< 4486e75ba647bd8b98fc1f053101b40caceeed4b affected
6.15 affected
< 6.15 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-2026-89721

Vulnerability Information
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Vulnerability Title
phy: rockchip-samsung-dcphy: fix out-of-range max_register
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: phy: rockchip-samsung-dcphy: fix out-of-range max_register The PHY register block is 64KB, so with a register stride of 4 the last accessible register sits at offset 0xfffc. max_register names 0x10000, one register past the end of the mapping: dumping the registers through the regmap debugfs interface reads beyond the ioremapped region and oopses on the unmapped page. The oops fires with the regmap lock held, so later PHY operations deadlock.
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 b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b ~ 14afe18655c0951f4f85898f761bf92264e65ccd -
Linux Linux 6.15 -

II. Public POCs for CVE-2026-89721

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III. Intelligence Information for CVE-2026-89721

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Patches & Fixes for CVE-2026-89721 (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-2026-89500 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

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