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CVE-2026-46168— mptcp: fix scheduling with atomic in timestamp sockopt

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mptcp时间戳sockopt中使用原子上下文调度，可能导致调度时原子panic。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1205.001 · Port Knocking

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 9061f24bf82ec2e92dd1e7c10b98b680db023d31< 0949d8bbbedbafe0136a1723c41eb823c2f1e09d affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< e792cfb6aeaf65612cdf8e3ac431d65e66283654 affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< ebeb70e29e37cfce899309cc2665a3bfe960ed94 affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< b157dab93a7af44a84e78cf0cb311dde475cff5b affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< 8a005fe451c73fd2b3d1faa5643c11e6bd07acfc affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< 7eb513b42721bee4b96da69f6188d5a7783f210d affected
9061f24bf82ec2e92dd1e7c10b98b680db023d31< b5c52908d52c6c8eb8933264aa6087a0600fd892 affected
5.14 affected
… +8 more rows
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I. Basic Information for CVE-2026-46168

Vulnerability Information
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Vulnerability Title
mptcp: fix scheduling with atomic in timestamp sockopt
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix scheduling with atomic in timestamp sockopt Using lock_sock_fast() (atomic context) around sock_set_timestamp() and sock_set_timestamping() is unsafe, as both helpers can sleep. Replace lock_sock_fast() with sleepable lock_sock()/release_sock() to avoid scheduling while atomic panic.
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
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mptcp时间戳sockopt中使用原子上下文调度，可能导致调度时原子panic。
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 9061f24bf82ec2e92dd1e7c10b98b680db023d31 ~ 0949d8bbbedbafe0136a1723c41eb823c2f1e09d -
Linux Linux 5.14 -

II. Public POCs for CVE-2026-46168

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III. Intelligence Information for CVE-2026-46168

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Patches & Fixes for CVE-2026-46168 (7)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle
CVE-2026-46176 7.8 HIGH RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger

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-2026-46168

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