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CVE-2026-31677— crypto: af_alg - limit RX SG extraction by receive buffer budget

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af_alg中RX散列表提取未限制接收缓冲区预算，可能导致接收端记账不匹配。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux e870456d8e7c8d57c059ea479b5aadbb55ff4c3a< 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 affected
e870456d8e7c8d57c059ea479b5aadbb55ff4c3a< 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 affected
e870456d8e7c8d57c059ea479b5aadbb55ff4c3a< 4a264b2614c73c96666e196bbabe0cead52bdba7 affected
e870456d8e7c8d57c059ea479b5aadbb55ff4c3a< 8eceab19eba9dcbfd2a0daec72e1bf48aa100170 affected
4.14 affected
< 4.14 unaffected
6.12.83≤ 6.12.* unaffected
6.18.24≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-31677

Vulnerability Information
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Vulnerability Title
crypto: af_alg - limit RX SG extraction by receive buffer budget
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget. af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request. If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.
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af_alg中RX散列表提取未限制接收缓冲区预算，可能导致接收端记账不匹配。
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 e870456d8e7c8d57c059ea479b5aadbb55ff4c3a ~ 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 -
Linux Linux 4.14 -

II. Public POCs for CVE-2026-31677

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-31677

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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-2026-31676 7.5 HIGH rxrpc: only handle RESPONSE during service challenge
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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31677

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