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CVE-2026-23066— rxrpc: Fix recvmsg() unconditional requeue

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于无条件重新排队，可能导致队列损坏。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 540b1c48c37ac0ad66212004db21e1ff7e2d78be< 8fd3b5e297854a4da0f273169baf4b1b7b257b97 affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< c198628f3fca5c874d93874c233014d336e09f64 affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< c6cebcb4e0b3140ec2ace45c020a9049527385d1 affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< 0464bf75590da75b8413c3e758c04647b4cdb3c6 affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< cf969bddd6e69c5777fa89dc88402204e72f312a affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< 930114425065f7ace6e0c0630fab4af75e059ea8 affected
540b1c48c37ac0ad66212004db21e1ff7e2d78be< 2c28769a51deb6022d7fbd499987e237a01dd63a affected
4.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-23066

Vulnerability Information
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Vulnerability Title
rxrpc: Fix recvmsg() unconditional requeue
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于无条件重新排队，可能导致队列损坏。
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 540b1c48c37ac0ad66212004db21e1ff7e2d78be ~ 8fd3b5e297854a4da0f273169baf4b1b7b257b97 -
Linux Linux 4.11 -

II. Public POCs for CVE-2026-23066

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III. Intelligence Information for CVE-2026-23066

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Patches & Fixes for CVE-2026-23066 (5)

Same Patch Batch · Linux · 2026-02-04 · 79 CVEs total

CVE-2026-23098 8.8 HIGH netrom: fix double-free in nr_route_frame()
CVE-2026-23077 7.8 HIGH mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
CVE-2026-23074 7.8 HIGH net/sched: Enforce that teql can only be used as root qdisc
CVE-2026-23105 7.8 HIGH net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag
CVE-2026-23103 7.8 HIGH ipvlan: Make the addrs_lock be per port
CVE-2026-23095 7.5 HIGH gue: Fix skb memleak with inner IP protocol 0.
CVE-2025-71192 7.0 HIGH ALSA: ac97: fix a double free in snd_ac97_controller_register()
CVE-2026-23062 platform/x86: hp-bioscfg: Fix kernel panic in GET_INSTANCE_ID macro
CVE-2026-23060 crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec
CVE-2026-23061 can: kvaser_usb: kvaser_usb_read_bulk_callback(): fix URB memory leak
CVE-2026-23064 net/sched: act_ife: avoid possible NULL deref
CVE-2026-23058 can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
CVE-2026-23057 vsock/virtio: Coalesce only linear skb
CVE-2026-23056 uacce: implement mremap in uacce_vm_ops to return -EPERM
CVE-2025-71199 iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
CVE-2025-71198 iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
CVE-2025-71197 w1: therm: Fix off-by-one buffer overflow in alarms_store
CVE-2026-23055 i2c: riic: Move suspend handling to NOIRQ phase
CVE-2026-23053 NFS: Fix a deadlock involving nfs_release_folio()
CVE-2026-23067 iommu/io-pgtable-arm: fix size_t signedness bug in unmap path

Showing top 20 of 79 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23066

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