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CVE-2026-46234— vsock: fix buffer size clamping order

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vsock缓冲区大小限制顺序错误，先限制最大值再限制最小值，导致缓冲区大小可能超过buffer_max_size。

AI Predicted 7.8 Difficulty: Easy EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1564.001 · Hidden Files and Directories

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< caf11dfea5233a69298a1c448bbf8d1639c80536 affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< 01ef69785dc3162f588a361ab770b1e312800188 affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< a998a7e250bf976539e05a00ec64a81292afecaa affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< 310da27932dd0afe7ce7456dfe1f0814c3301f41 affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160 affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< 0b68881501460c3761f196469e1e503218c5e536 affected
b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97< d114bfdc9b76bf93b881e195b7ec957c14227bab affected
… +10 more rows
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I. Basic Information for CVE-2026-46234

Vulnerability Information
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Vulnerability Title
vsock: fix buffer size clamping order
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.
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vsock缓冲区大小限制顺序错误，先限制最大值再限制最小值，导致缓冲区大小可能超过buffer_max_size。
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 b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 ~ f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-46234

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III. Intelligence Information for CVE-2026-46234

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Patches & Fixes for CVE-2026-46234 (7)

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

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-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
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-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
CVE-2026-46227 7.8 HIGH sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle

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-2026-46234

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