CVE-2026-89628— HID: picolcd: clamp eeprom debugfs read to bytes actually received
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.
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于picolcd_debug_eeprom_read()函数信任设备REPORT_EE_DATA回复中提供的长度字节，而未校验实际接收的数据长度resp->raw_size，可能导致复制数据时越界读取相邻slab内存并将信息返回给用户空间。
Affected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 1a02056c2bf7ef9b5fd05ee6913aeeadb703c443 |
affected |
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 65daa322f1021d8206f8032c4cd4c0cb2d26c7c3 |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 8dc662af019158690c470edd2e2857657f700abb |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 4daf432c94a42e7be6aa10b012b33af5ed9bc118 |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< a3e6e8d7198a9f3861861520a38b673684a1062b |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 471f4a939c66d1d44aece2321807abf609fc9098 |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< 699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84 |
affected | ||
9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba< e9c667395ac1f8024f623250b32bae4c7af9caa0 |
affected | ||
| … +10 more rows | |||
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-89628
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
HID: picolcd: clamp eeprom debugfs read to bytes actually received
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
HID: picolcd: clamp eeprom debugfs read to bytes actually received
picolcd_debug_eeprom_read() trusts resp->raw_data[2] -- a length byte
supplied by the device in its REPORT_EE_DATA reply -- clamped only to
the caller's read() count:
ret = resp->raw_data[2];
if (ret > s)
ret = s;
if (copy_to_user(u, resp->raw_data+3, ret))
It never checks resp->raw_size, the number of bytes picolcd_raw_event()
actually copied into the 64-byte raw_data[] of the kmalloc'd struct
picolcd_pending. A device (or a spoofed picoLCD) returning a length byte
of 0xff, read with a count >= 255, makes copy_to_user() read past
raw_data[] into adjacent slab memory and return it to userspace through
the debugfs "eeprom" file:
BUG: KASAN: slab-out-of-bounds in _copy_to_user
Read of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd]
The debug-dump path in the same file already validates the device length
byte against the received size before trusting it; this read does not.
The file is created S_IRUSR (root-only) and a crafted device is needed,
so it is neither unprivileged- nor remotely-triggerable.
Clamp the copy length to resp->raw_size - 3 (the payload actually
received, minus the 3-byte header), floored at 0 for short replies.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于picolcd_debug_eeprom_read()函数信任设备REPORT_EE_DATA回复中提供的长度字节，而未校验实际接收的数据长度resp->raw_size，可能导致复制数据时越界读取相邻slab内存并将信息返回给用户空间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-89628
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-89628
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-89628 (8)
Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total
| CVE-2026-89688 | 9.8 CRITICAL | nfsd: drop the stateid, not the stateowner, on seqid_op replay retry |
| CVE-2026-89656 | 9.8 CRITICAL | libceph: reject buckets with mismatched CRUSH ids |
| CVE-2026-89655 | 9.8 CRITICAL | ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock |
| CVE-2026-89658 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup |
| CVE-2026-89660 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during admin state revocation |
| CVE-2026-89659 | 9.8 CRITICAL | NFSD: Prevent client use-after-free during delegation revoke |
| CVE-2026-89662 | 9.8 CRITICAL | NFSD: Prevent lock owner use-after-free during client teardown |
| CVE-2026-89669 | 9.8 CRITICAL | nfsd: initialize copy-notify stateid before publishing it |
| CVE-2026-89674 | 9.8 CRITICAL | nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget |
| CVE-2026-89675 | 9.8 CRITICAL | nfsd: fix UAF in async copy cancel and shutdown |
| CVE-2026-89676 | 9.8 CRITICAL | nfsd: fix stale s2s_cp_stateids IDR entry for async COPY |
| CVE-2026-89677 | 9.8 CRITICAL | nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file() |
| CVE-2026-89681 | 9.8 CRITICAL | nfsd: fix layout fence worker double-reference race |
| CVE-2026-89686 | 9.8 CRITICAL | nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke |
| CVE-2026-89703 | 9.8 CRITICAL | nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations |
| CVE-2026-89479 | 9.8 CRITICAL | sctp: stop processing a packet once its association is deleted |
| CVE-2026-89478 | 9.8 CRITICAL | sctp: drop a chunk if its transport was removed |
| CVE-2026-89702 | 9.8 CRITICAL | nfsd: size fh_verify server sockaddr slot by xpt_locallen |
| CVE-2026-89482 | 9.8 CRITICAL | nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone |
| CVE-2026-89708 | 9.8 CRITICAL | nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown |
Showing top 20 of 431 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize
Same vendor: Linux
-
CVE-2026-98385
sched/cache: Decouple sched_cache_group from mm to fix UAF -
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize
V. Comments for CVE-2026-89628
No comments yet