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CVE-2026-53181— vsock/vmci: fix sk_ack_backlog leak on failed handshake

AI Predicted 5.3 Difficulty: Moderate EPSS 0.18% · P8

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxd021c344051af91f42c5ba9fdedc176740cbd238< 22c587aa3ab1ab5264daff3ec32136fd30436c13affected
d021c344051af91f42c5ba9fdedc176740cbd238< cf7090e255d74c4b61c51f8ede9fcacdd8393b5baffected
d021c344051af91f42c5ba9fdedc176740cbd238< ea0b03d52881c12a8c634ea0d6cbfa61cefdb488affected
d021c344051af91f42c5ba9fdedc176740cbd238< dfd853197615d322d3a88dbcab91fc0fd2096219affected
d021c344051af91f42c5ba9fdedc176740cbd238< bcb275626055df7f8f947f1a349754b4004d9a15affected
d021c344051af91f42c5ba9fdedc176740cbd238< ba9ad6015937a5e46ba1a31370e3efdec8abbdccaffected
d021c344051af91f42c5ba9fdedc176740cbd238< 9698582a4dd9c4a05889d7db96d4c0edc9e69cacaffected
d021c344051af91f42c5ba9fdedc176740cbd238< c05fa14db43ebef3bd862ca9d073981c0358b3f0affected
… +10 more rows
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I. Basic Information for CVE-2026-53181

Vulnerability Information
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Vulnerability Title
vsock/vmci: fix sk_ack_backlog leak on failed handshake
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix sk_ack_backlog leak on failed handshake When vmci_transport_recv_connecting_server() returns an error, vmci_transport_recv_listen() calls vsock_remove_pending() but never calls sk_acceptq_removed(). This leaves sk_ack_backlog incremented permanently. Repeated handshake failures (malformed packets, queue pair alloc failure, event subscribe failure) cause sk_ack_backlog to climb toward sk_max_ack_backlog. Once it reaches the limit the listener permanently refuses all new connections with -ECONNREFUSED, a silent denial of service requiring a process restart to recover. The two existing sk_acceptq_removed() calls in af_vsock.c do not cover this path: line 764 checks vsock_is_pending() which returns false after vsock_remove_pending(), and line 1889 is only reached on successful accept(). Fix by balancing sk_acceptq_added() with sk_acceptq_removed() on the error path.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux d021c344051af91f42c5ba9fdedc176740cbd238 ~ 22c587aa3ab1ab5264daff3ec32136fd30436c13 -
LinuxLinux 3.9 -

II. Public POCs for CVE-2026-53181

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III. Intelligence Information for CVE-2026-53181

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Patches & Fixes for CVE-2026-53181 (8)

Same Patch Batch · Linux · 2026-06-25 · 147 CVEs total

CVE-2026-531759.8 CRITICALinet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-531769.8 CRITICALIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-532219.8 CRITICALip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-532289.8 CRITICALipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-532169.8 CRITICALnet: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-531519.8 CRITICALrxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-532609.8 CRITICALtcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-532159.8 CRITICALnet: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-532479.8 CRITICALnet: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-532469.8 CRITICALsctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-531319.4 CRITICALnetfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-532259.1 CRITICALsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-531869.1 CRITICALRDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-532249.1 CRITICALsctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-532008.8 HIGHKVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-532778.8 HIGHKVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
CVE-2026-532328.8 HIGHnet: phy: clean the sfp upstream if phy probing fails
CVE-2026-532488.8 HIGHnet: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-531988.8 HIGHksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-532408.8 HIGHxfrm: iptfs: fix use-after-free on first_skb in __input_process_payload

Showing top 20 of 147 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53181

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