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CVE-2026-80645— rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()

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rapidio/tsi721驱动的tsi721_db_dpc()函数中found变量未在每次循环迭代开始时重置为false，导致在遍历链表时可能错误地标记doorbell，从而引发无效内存解引用。

CVSS 8.1 · High EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 48618fb4e522d9d02e217ac05f52749545c1af20< 9e775c3199903d7c09a52530042b1198eab705bd affected
48618fb4e522d9d02e217ac05f52749545c1af20< 81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43 affected
48618fb4e522d9d02e217ac05f52749545c1af20< 13092966ba5d8fb214a4efeddc87f9ed0fd2f945 affected
48618fb4e522d9d02e217ac05f52749545c1af20< acd54f42abbbd806464468838dbc04efd203d2be affected
48618fb4e522d9d02e217ac05f52749545c1af20< 3b5c66e922aa6a3331915a14520848a5b3beccc7 affected
48618fb4e522d9d02e217ac05f52749545c1af20< 070f356ea4f419e4e85e4089381f4477f41d969e affected
48618fb4e522d9d02e217ac05f52749545c1af20< dc28a14f3e4546b2b06098d24177942540581a5f affected
48618fb4e522d9d02e217ac05f52749545c1af20< fc15e3a30ddd950f009c76765331783b9af94a87 affected
… +10 more rows
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I. Basic Information for CVE-2026-80645

Vulnerability Information
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Vulnerability Title
rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc() With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory. This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found. Reset the "found" to false at the start of the iteration and move the variable inside the loop.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/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存在安全漏洞，该漏洞源于rapidio/tsi721驱动的tsi721_db_dpc()函数中found变量未在每次循环迭代开始时重置为false，导致在遍历链表时可能错误地标记doorbell，从而引发无效内存解引用。
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 48618fb4e522d9d02e217ac05f52749545c1af20 ~ 9e775c3199903d7c09a52530042b1198eab705bd -
Linux Linux 3.2 -

II. Public POCs for CVE-2026-80645

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III. Intelligence Information for CVE-2026-80645

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Patches & Fixes for CVE-2026-80645 (8)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80645

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