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CVE-2026-68340— hwmon: occ: validate poll response sensor blocks

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 5.0版本存在安全漏洞，该漏洞源于OCC轮询响应解析器未正确验证传感器数据块边界，可能导致越界读取。

CVSS 7.7 · High EPSS 0.15% · P4

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux aa195fe49b033db545ad986cdb2c431c37bea557< 6e6c72c37433640514db325408bd6913ad28fe69 affected
aa195fe49b033db545ad986cdb2c431c37bea557< 1902e9572901d37901e3db1f3f6b0885f4e49a66 affected
aa195fe49b033db545ad986cdb2c431c37bea557< 112525534ab5cff482d35897ca4ca11fd3a76f46 affected
aa195fe49b033db545ad986cdb2c431c37bea557< 54cb78eceb4e286ccd5a5c01a4632157860d47f0 affected
aa195fe49b033db545ad986cdb2c431c37bea557< 538d862cc0dbd5c732fe26d5aad98eae039e6676 affected
aa195fe49b033db545ad986cdb2c431c37bea557< b042e538e98b939fccfffc464e2c34c29f0e96ef affected
aa195fe49b033db545ad986cdb2c431c37bea557< 70e76e700fc6c46afb4e17aec099a1ea089b4a22 affected
5.0 affected
… +8 more rows
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I. Basic Information for CVE-2026-68340

Vulnerability Information
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Vulnerability Title
hwmon: occ: validate poll response sensor blocks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: hwmon: occ: validate poll response sensor blocks The OCC poll response parser walks a counted list of sensor data blocks. It used the static backing-array capacity as the parse boundary, but a transport response makes only data_length bytes current and valid. A truncated response can therefore make the parser consume a block header or block extent outside the current response. Use data_length as the parent boundary, prove the fixed poll header and each current block header before reading them, and prove the complete block before advancing. Keep parsed sensor metadata local until the complete response has passed validation, then publish it. Propagate malformed-response errors before publishing the OCC as active.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
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 5.0版本存在安全漏洞，该漏洞源于OCC轮询响应解析器未正确验证传感器数据块边界，可能导致越界读取。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux aa195fe49b033db545ad986cdb2c431c37bea557 ~ 6e6c72c37433640514db325408bd6913ad28fe69 -
Linux Linux 5.0 -

II. Public POCs for CVE-2026-68340

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III. Intelligence Information for CVE-2026-68340

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Patches & Fixes for CVE-2026-68340 (7)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68340

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