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

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。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 715eb12e453df752f1b4baaf972c3acff0ab9402 affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 7247d05c987c3eec4bb7c2306dbd77ecdf3b7c73 affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 071f1a38d7ddbadee29c09b9e3ee0ff3a61e6a0e affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 804bb969f194c93497ba632b98343794c6367fdc affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 0fc7069d39239978130c37ebceaec85c8948d3f1 affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< 8dba7a94a269b88e500aafc25ad567ef6a423698 affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< c9961336aa5ff83092f23e33ee86666a9dbd1b2a affected
fe94cc290f535709d3c5ebd1e472dfd0aec7ee79< a75d99f46bf21b45965ce39c5cfb3b8bb5ffb1aa affected
… +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

Vendor Product Affected Versions CPE Subscribe
Linux Linux fe94cc290f535709d3c5ebd1e472dfd0aec7ee79 ~ 715eb12e453df752f1b4baaf972c3acff0ab9402 -
Linux Linux 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 · 844 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72400

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