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CVE-2026-31668— seg6: separate dst_cache for input and output paths in seg6 lwtunnel

CVSS 9.8 · Critical EPSS 0.07% · P21
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I. Basic Information for CVE-2026-31668

Vulnerability Information
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Vulnerability Title
seg6: separate dst_cache for input and output paths in seg6 lwtunnel
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: seg6: separate dst_cache for input and output paths in seg6 lwtunnel The seg6 lwtunnel uses a single dst_cache per encap route, shared between seg6_input_core() and seg6_output_core(). These two paths can perform the post-encap SID lookup in different routing contexts (e.g., ip rules matching on the ingress interface, or VRF table separation). Whichever path runs first populates the cache, and the other reuses it blindly, bypassing its own lookup. Fix this by splitting the cache into cache_input and cache_output, so each path maintains its own cached dst independently.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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seg6 lwtunnel中dst_cache在输入和输出路径间共享，可能导致后执行路径盲目重用前一路径的缓存，绕过自身路由查找。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 6c8702c60b88651072460f3f4026c7dfe2521d12 ~ 1dec91d3b1cefb82635761b7812154af3ef46449 -
LinuxLinux 4.10 -

II. Public POCs for CVE-2026-31668

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III. Intelligence Information for CVE-2026-31668

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Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-316379.8 CRITICALrxrpc: reject undecryptable rxkad response tickets
CVE-2026-315369.8 CRITICALsmb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-315899.8 CRITICALmm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-316699.8 CRITICALmptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-316499.8 CRITICALnet: stmmac: fix integer underflow in chain mode
CVE-2026-316339.8 CRITICALrxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-316079.8 CRITICALusbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-316089.8 CRITICALsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-316099.8 CRITICALsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-316579.8 CRITICALbatman-adv: hold claim backbone gateways by reference
CVE-2026-316599.8 CRITICALbatman-adv: reject oversized global TT response buffers
CVE-2026-316369.1 CRITICALrxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-315888.8 HIGHKVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-315708.8 HIGHcan: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-316228.8 HIGHNFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-315588.8 HIGHLoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-315538.8 HIGHKVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-316298.8 HIGHnfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-316118.6 HIGHksmbd: require 3 sub-authorities before reading sub_auth[2]
CVE-2026-316318.2 HIGHrxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

Showing top 20 of 138 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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