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CVE-2026-31684— net: sched: act_csum: validate nested VLAN headers

EPSS 0.01% · P2
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I. Basic Information for CVE-2026-31684

Vulnerability Information
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Vulnerability Title
net: sched: act_csum: validate nested VLAN headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: sched: act_csum: validate nested VLAN headers tcf_csum_act() walks nested VLAN headers directly from skb->data when an skb still carries in-payload VLAN tags. The current code reads vlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without first ensuring that the full VLAN header is present in the linear area. If only part of an inner VLAN header is linearized, accessing h_vlan_encapsulated_proto reads past the linear area, and the following skb_pull(VLAN_HLEN) may violate skb invariants. Fix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and pulling each nested VLAN header. If the header still is not fully available, drop the packet through the existing 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)
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act_csum中嵌套VLAN标头未确保线性存在，可能导致读取线性区域外数据及skb_pull违反不变量。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 2ecba2d1e45b24620a7c3df9531895cf68d5dec6 ~ eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2 -
LinuxLinux 5.1 -

II. Public POCs for CVE-2026-31684

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III. Intelligence Information for CVE-2026-31684

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

CVE-2026-316859.4 CRITICALnetfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-316829.1 CRITICALbridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-316837.8 HIGHbatman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-316807.8 HIGHnet: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-316787.8 HIGHopenvswitch: defer tunnel netdev_put to RCU release
CVE-2026-316757.8 HIGHnet/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-316737.8 HIGHaf_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-316767.5 HIGHrxrpc: only handle RESPONSE during service challenge
CVE-2026-316797.1 HIGHopenvswitch: validate MPLS set/set_masked payload length
CVE-2026-316747.1 HIGHnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31681netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31684

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