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CVE-2026-98554— vlan: ensure sufficient headroom in vlan_dev_hard_header()

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.

在 Linux 内核中，以下漏洞已得到修复： vlan：确保 vlan_dev_hard_header() 函数中有足够的头部空间（headroom） 某些调用者仅预留了 ETH_HLEN 或更少的空间（例如 llc_alloc_frame()），或者在动态设备/头部空间变更之前分配的 skb（例如切换 VLAN_FLAG_REORDER_HDR 标志，或 bonding/team 切换从属设备时），可能导致 vlan_dev_hard_header() 在头部空间不足的情况下被调用，从而触发 skb_under_

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 55e007fc3b4d76fa4d6b4660f6904fe6ab045a1b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5aca8e6a8ff6aeae358c1d9b65447aac416ace95 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4ba1f57313f36a3ce6f77d593548f0c511f34aa1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ca797491f0ae4bfde9039f79f6f1ed7781c9110f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cfba0f45553de2b803059e3d539a1e418df24da8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c7ee4bea64f559ea8e03260014775b64c720cb5b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 90d51095371d96747f45bbd8504edf6513e039ef affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cd5dd68267c4238795fadaf02b3575ca3f8a6500 affected
… +10 more rows
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I. Basic Information for CVE-2026-98554

Vulnerability Information
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Vulnerability Title
vlan: ensure sufficient headroom in vlan_dev_hard_header()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vlan: ensure sufficient headroom in vlan_dev_hard_header() Callers that only reserve ETH_HLEN or less (such as llc_alloc_frame()), or skbs allocated before dynamic device/headroom changes (e.g. toggling VLAN_FLAG_REORDER_HDR or bonding/team switching slaves), can reach vlan_dev_hard_header() with insufficient headroom and trigger skb_under_panic(). Use skb_cow_head() in vlan_dev_hard_header() when VLAN_FLAG_REORDER_HDR is not set to ensure sufficient headroom for the VLAN header(s) and the underlying device hard header. Use READ_ONCE() to read dev->hard_header_len and dev->needed_headroom as they can be updated concurrently under RTNL (e.g. in vlan_transfer_features()) while vlan_dev_hard_header() runs locklessly on the transmit path. Also avoid LL_RESERVED_SPACE(dev) here so that the extra HH_DATA_MOD alignment padding does not trigger unnecessary pskb_expand_head() reallocations on inner stacked VLAN devices after the outer VLAN header has been pushed.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 55e007fc3b4d76fa4d6b4660f6904fe6ab045a1b -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-98554

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III. Intelligence Information for CVE-2026-98554

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Patches & Fixes for CVE-2026-98554 (8)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98583 nfc: nfcmrvl: validate helper command length before pull
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98554

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