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CVE-2026-72400— seg6: validate SRH length before reading fixed fields

CVSS 7.8 · High EPSS 0.16% · P6

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinuxfe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 715eb12e453df752f1b4baaf972c3acff0ab9402affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0eaffected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 804bb969f194c93497ba632b98343794c6367fdcaffected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 0fc7069d39239978130c37ebceaec85c8948d3f1affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 8dba7a94a269b88e500aafc25ad567ef6a423698affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< c9961336aa5ff83092f23e33ee86666a9dbd1b2aaffected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aaaffected
… +10 more rows
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I. Basic Information for CVE-2026-72400

Vulnerability Information
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Vulnerability Title
seg6: validate SRH length before reading fixed fields
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: seg6: validate SRH length before reading fixed fields seg6_validate_srh() reads fixed SRH fields such as srh->type and srh->hdrlen before checking that the supplied length covers the fixed struct ipv6_sr_hdr fields. The BPF SEG6 encap path reaches this with a BPF program-supplied pointer and length: bpf_lwt_push_encap() and the SEG6 local BPF END_B6 and END_B6_ENCAP actions call bpf_push_seg6_encap(), which forwards the length to seg6_validate_srh() with no minimum-size guard. A 2-byte SEG6 encap header can therefore make the validator read srh->type at offset 2 beyond the caller-supplied buffer. Reject lengths shorter than the fixed SRH at the top of seg6_validate_srh(), before any field is read. This fixes the BPF helper path and keeps the common validator robust.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于seg6_validate_srh()函数在检查提供的长度是否覆盖固定字段之前读取固定SRH字段，可能允许攻击者通过特制的SEG6封装头触发越界读取。
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 fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 ~ 715eb12e453df752f1b4baaf972c3acff0ab9402 -
LinuxLinux 4.18 -

II. Public POCs for CVE-2026-72400

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III. Intelligence Information for CVE-2026-72400

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Patches & Fixes for CVE-2026-72400 (7)

Same Patch Batch · Linux · 2026-08-15 · 846 CVEs total

CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-724639.8 CRITICALxfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-722489.8 CRITICALnetfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-723819.8 CRITICALksmbd: fix use-after-free of fp->owner.name in durable handle owner check
CVE-2026-724779.8 CRITICALfs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-724739.8 CRITICALxprtrdma: Decouple req recycling from RPC completion
CVE-2026-724729.8 CRITICALnfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-744069.8 CRITICALvxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
CVE-2026-722229.8 CRITICALsunrpc: pin svc_xprt across the asynchronous TLS handshake callback
CVE-2026-721379.8 CRITICALxfrm: nat_keepalive: avoid double free on send error
CVE-2026-743769.8 CRITICALmd/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-722269.8 CRITICALbatman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-722349.8 CRITICALbatman-adv: access unicast_ttvn skb->data only after skb realloc

Showing top 20 of 846 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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