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CVE-2026-89562— ip6_gre: fix hardware header length for NBMA tunnels

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ip6gre_tnl_link_config_route()函数在设置header_ops时错误地将下层设备硬件头长度累加到dev->hard_header_len，导致NBMA隧道硬件头长度配置错误。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 832ba596494b2c9eac7760259eff2d8b7dcad0ee< cb1afd087aedc90e5274537e4fb9bf3f98e5afdb affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< 7719f6e7ed2ffddc2c3bb61f4467b76d49e0af6a affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< b1e95e3602d8e112458627f14c6c31c21f2188cb affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< c3457a5aae5fb43f7023d3f3dc472c2afa22acf0 affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< 8bfe746afee38dd6e4348ddcd22d554789dbb9ff affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< b8282668d8fa7c61b80e8e4890729031c291a16c affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< 565038b0092f65afe384961c0f548d605bf438b9 affected
832ba596494b2c9eac7760259eff2d8b7dcad0ee< 505b6d296c486ef7d1274f279d4c43a172f63224 affected
… +16 more rows
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I. Basic Information for CVE-2026-89562

Vulnerability Information
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Vulnerability Title
ip6_gre: fix hardware header length for NBMA tunnels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ip6_gre: fix hardware header length for NBMA tunnels ip6gre_tnl_link_config_route() accumulates the lower device's hardware header length into dev->hard_header_len whenever header_ops is set. This is incorrect for both users of header_ops. ip6gretap and ip6erspan have a fixed Ethernet hardware header length. For an NBMA ip6gre tunnel, ip6gre_header() creates only the GRE header, the optional FOU or GUE header, and the outer IPv6 header. The lower device header is headroom needed later, not part of the tunnel device's hardware header. Keep the lower device header in needed_headroom. Set hard_header_len to the tunnel header length only for ARPHRD_IP6GRE devices with header_ops, and leave the fixed Ethernet header length unchanged for tap and erspan devices.
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ip6gre_tnl_link_config_route()函数在设置header_ops时错误地将下层设备硬件头长度累加到dev->hard_header_len，导致NBMA隧道硬件头长度配置错误。
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 832ba596494b2c9eac7760259eff2d8b7dcad0ee ~ cb1afd087aedc90e5274537e4fb9bf3f98e5afdb -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-89562

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III. Intelligence Information for CVE-2026-89562

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Patches & Fixes for CVE-2026-89562 (7)

Vendor Advisories for CVE-2026-89562 (1)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89688 9.8 CRITICAL nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
CVE-2026-89656 9.8 CRITICAL libceph: reject buckets with mismatched CRUSH ids
CVE-2026-89655 9.8 CRITICAL ceph: fix UAF in __kick_flushing_caps() on cf entry freed during unlock
CVE-2026-89658 9.8 CRITICAL NFSD: Prevent client use-after-free during NFSv4.0 revoked-state cleanup
CVE-2026-89660 9.8 CRITICAL NFSD: Prevent client use-after-free during admin state revocation
CVE-2026-89659 9.8 CRITICAL NFSD: Prevent client use-after-free during delegation revoke
CVE-2026-89662 9.8 CRITICAL NFSD: Prevent lock owner use-after-free during client teardown
CVE-2026-89669 9.8 CRITICAL nfsd: initialize copy-notify stateid before publishing it
CVE-2026-89674 9.8 CRITICAL nfsd: fix XDR length calculation in nfsd4_ff_encode_layoutget
CVE-2026-89675 9.8 CRITICAL nfsd: fix UAF in async copy cancel and shutdown
CVE-2026-89676 9.8 CRITICAL nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
CVE-2026-89677 9.8 CRITICAL nfsd: fix possible fh_compose of wrong dentry in nfsd4_create_file()
CVE-2026-89681 9.8 CRITICAL nfsd: fix layout fence worker double-reference race
CVE-2026-89686 9.8 CRITICAL nfsd: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke
CVE-2026-89703 9.8 CRITICAL nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
CVE-2026-89479 9.8 CRITICAL sctp: stop processing a packet once its association is deleted
CVE-2026-89478 9.8 CRITICAL sctp: drop a chunk if its transport was removed
CVE-2026-89702 9.8 CRITICAL nfsd: size fh_verify server sockaddr slot by xpt_locallen
CVE-2026-89482 9.8 CRITICAL nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89708 9.8 CRITICAL nfsd: RCU-protect cl_cb_session to fix use-after-free on session teardown

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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