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CVE-2026-93191— smack: fix incorrect task context in smack_msg_queue_msgrcv

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： smack：修复 smack_msg_queue_msgrcv 中不正确的任务上下文 函数错误地检查了 'current'（当前）任务的权限，而未检查 'target'（目标）任务的权限。 在 系统调用路径中，如果已有接收者正在等待，则会使用 优化机制，将消息直接推送到接收者任务： 在此情况下，'sender'（发送方，即 current）任务代表 'receiver'（接收方，即 msr->r_tsk，作为 'target' 参数传入）执行权

AI Predicted 4.4 Difficulty: Hard EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e114e473771c848c3cfec05f0123e70f1cdbdc99< 4e49f997ef0c569e09b42aab6bd38c7c54ea095d affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< dbece6c2f80b0470d8d99d7a016827dce99ed6e3 affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< 7be4bd21c50afa83c93799b0f16cf5bfa493194e affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< ec47f4177046dfaaf1cebb15f4d2e7b543475daf affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< e35dc5a4ed6d1e536382d80c685187511ff248a1 affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< c2ab27c2e11591524b1378c24ad18882a425d1fa affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe affected
e114e473771c848c3cfec05f0123e70f1cdbdc99< fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5 affected
… +10 more rows
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I. Basic Information for CVE-2026-93191

Vulnerability Information
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Vulnerability Title
smack: fix incorrect task context in smack_msg_queue_msgrcv
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smack: fix incorrect task context in smack_msg_queue_msgrcv The smack_msg_queue_msgrcv() function incorrectly checks the permissions of the 'current' task instead of the 'target' task. In the msgsnd() syscall path, if a receiver is already waiting, the pipelined_send() optimization is used to push the message directly to the receiver task: ipc/msg.c`pipelined_send(): ` smp_store_release(&msr->r_msg, msg) In this case, the 'sender' (current) task performs the check on behalf of the 'receiver' task (msr->r_tsk, passed as the 'target' parameter): ipc/msg.c`pipelined_send(): ` security_msg_queue_msgrcv(,, target := msr->r_tsk,,) However, smack_msg_queue_msgrcv() ignores the 'target' and checks 'current': smack_msg_queue_msgrcv(…) ` smk_curacc_msq(isp, MAY_READWRITE); // current task 'current' MAY satisfy smack_msg_queue_msgrcv r/w requirement, but 'target' (the receiver task) might NOT; as a result, an unauthorized receiver gets the message, violating MAC policy. Test: 1) create a sysv message queue with label “foo” 2) echo "bar foo r" >/smack/load2 3) msgrcv(,,,0,MSG_NOERROR) in "bar"-labeled task. The task is waiting for the messages ... 4) msgsnd() from a "foo"-labeled task: "bar"-labeled task gets the message. This patch fixes the issue by checking permission on the 'target' task instead of 'current'. (2008-02-04, Casey Schaufler)
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 e114e473771c848c3cfec05f0123e70f1cdbdc99 ~ 4e49f997ef0c569e09b42aab6bd38c7c54ea095d -
Linux Linux 2.6.25 -

II. Public POCs for CVE-2026-93191

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III. Intelligence Information for CVE-2026-93191

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Patches & Fixes for CVE-2026-93191 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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