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CVE-2026-80691— scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE

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 6.5版本存在安全漏洞，该漏洞源于iblock_execute_pr_out()函数中PRO_PREEMPT、PRO_PREEMPT_AND_ABORT和PRO_RELEASE操作通过ops->pr_clear进行回调能力检查时，错误检查允许未实现的钩子通过，可能导致空函数指针解引用。

CVSS 7.5 · High EPSS 0.44% · P37

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 394f811848827ad23d2b43e94e5d72a24cfbc39f< 3c60a8b4037dc35e365658fcbcb349a5d742ff49 affected
394f811848827ad23d2b43e94e5d72a24cfbc39f< a326b19cfb7775378b50acaa8d836ba44e29b4c2 affected
394f811848827ad23d2b43e94e5d72a24cfbc39f< bdd8a1297ef101bb5ac57e53b4fbe5e364afd8b1 affected
394f811848827ad23d2b43e94e5d72a24cfbc39f< f15bcf9a99b1b2683fcfa005b9b3680b5600581f affected
394f811848827ad23d2b43e94e5d72a24cfbc39f< 9c33222bd387312874fbe36ca8002e5c945b9653 affected
6.5 affected
< 6.5 unaffected
6.6.151≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80691

Vulnerability Information
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Vulnerability Title
scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE In the iblock_execute_pr_out() function, PRO_PREEMPT, PRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability checks through ops->pr_clear. The error check allows unimplemented hooks to pass through the gate, resulting dereferencing a NULL function pointer. Check whether the hooks that need to be called are supported.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 6.5版本存在安全漏洞，该漏洞源于iblock_execute_pr_out()函数中PRO_PREEMPT、PRO_PREEMPT_AND_ABORT和PRO_RELEASE操作通过ops->pr_clear进行回调能力检查时，错误检查允许未实现的钩子通过，可能导致空函数指针解引用。
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 394f811848827ad23d2b43e94e5d72a24cfbc39f ~ 3c60a8b4037dc35e365658fcbcb349a5d742ff49 -
Linux Linux 6.5 -

II. Public POCs for CVE-2026-80691

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III. Intelligence Information for CVE-2026-80691

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Patches & Fixes for CVE-2026-80691 (5)

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-2026-80691

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