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CVE-2026-31676— rxrpc: only handle RESPONSE during service challenge

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rxrpc服务挑战状态中未正确检查状态，可能导致重复或延迟RESPONSE包重新执行设置路径。

CVSS 7.5 · High EPSS 0.83% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 17926a79320afa9b95df6b977b40cca6d8713cea< a1a8efde03a40b6c658d580e96644d9b9a2a0d3a affected
17926a79320afa9b95df6b977b40cca6d8713cea< 6c3a0fbdafef8316e34ae22333e317a341e737cd affected
17926a79320afa9b95df6b977b40cca6d8713cea< 0afdfd4941c1b60a1f5c361760daa970edca60cd affected
17926a79320afa9b95df6b977b40cca6d8713cea< a6bcf8010af093fe04f7100562e9542ab7882585 affected
17926a79320afa9b95df6b977b40cca6d8713cea< 29b44d904dceb832be880def08b8cb17a0aba91c affected
17926a79320afa9b95df6b977b40cca6d8713cea< d0035e634dae83237ab7f5681eb52b2f65d0ceb8 affected
17926a79320afa9b95df6b977b40cca6d8713cea< 03fd2ef73cb4ffd0af100a95b634af54f474414e affected
17926a79320afa9b95df6b977b40cca6d8713cea< c43ffdcfdbb5567b1f143556df8a04b4eeea041c affected
… +10 more rows
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I. Basic Information for CVE-2026-31676

Vulnerability Information
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Vulnerability Title
rxrpc: only handle RESPONSE during service challenge
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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rxrpc服务挑战状态中未正确检查状态，可能导致重复或延迟RESPONSE包重新执行设置路径。
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 17926a79320afa9b95df6b977b40cca6d8713cea ~ a1a8efde03a40b6c658d580e96644d9b9a2a0d3a -
Linux Linux 2.6.22 -

II. Public POCs for CVE-2026-31676

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III. Intelligence Information for CVE-2026-31676

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Patches & Fixes for CVE-2026-31676 (5)

Same Patch Batch · Linux · 2026-04-25 · 13 CVEs total

CVE-2026-31685 9.4 CRITICAL netfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-31682 9.1 CRITICAL bridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-31683 7.8 HIGH batman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-31680 7.8 HIGH net: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-31678 7.8 HIGH openvswitch: defer tunnel netdev_put to RCU release
CVE-2026-31675 7.8 HIGH net/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-31673 7.8 HIGH af_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-31679 7.1 HIGH openvswitch: validate MPLS set/set_masked payload length
CVE-2026-31674 7.1 HIGH netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684 net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681 netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677 crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31676

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