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CVE-2026-80844— xfrm: ah6: validate routing header segments_left

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AH6在计算或验证ICV前重新排列路由头地址时，对路由头中segments_left字段的验证不足，处理原始IPv6 HDRINCL数据包时可能导致越界访问。

AI Predicted 5.7 Difficulty: Moderate EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2dc650956e4e163b879b3fb1027f9557abc5c985 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 48b0e36cf54358276ee7aa897034c973097d2bc9 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1b7e066eabcc7d6d8f476c34739b45932f2f4c31 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f00df8500e5a36ba70d336fd34bd2152ea074e5f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1516e31ac458a738be485620579d8f7fb2700fcb affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6733ae71268a27d598cfb3f3339a3c950b9b656d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0bf11081ad3753938a2b48723ce6298dbac743a1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 46640c814f25f096b0b0045ca50e1b7030cd8a30 affected
… +12 more rows
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I. Basic Information for CVE-2026-80844

Vulnerability Information
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Vulnerability Title
xfrm: ah6: validate routing header segments_left
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access. Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于AH6在计算或验证ICV前重新排列路由头地址时，对路由头中segments_left字段的验证不足，处理原始IPv6 HDRINCL数据包时可能导致越界访问。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 2dc650956e4e163b879b3fb1027f9557abc5c985 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-80844

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III. Intelligence Information for CVE-2026-80844

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Patches & Fixes for CVE-2026-80844 (9)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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