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CVE-2026-99211— netlink: reset skb headers before unicast and multicast filtering

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： netlink：在单播和多播过滤之前重置 skb 头部 套接字过滤器可使用 和 来相对于套接字缓冲区（skb）的网络层和链路层（MAC）头部读取数据。某些 Netlink 消息生产者可能会预留头部空间（headroom），却未重置这些头部指针，从而导致接收方套接字的过滤器能够读取到尚未初始化的消息之前的数据。 例如，IWPM 的 HELLO 响应是通过 分配的，该函数会预留 字节的空间。一个未授权的 用户可以附加一个传统套接字过滤器，并通过响应消息的长度来泄露这部分预留

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1069.006

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux b1153f29ee07dc1a788964409255a4b4fae50b98< 06791594274f87c29f1a9f1961d700272716a49d affected
b1153f29ee07dc1a788964409255a4b4fae50b98< 06935da5de83aa8b98841563894857e7d2f80e47 affected
b1153f29ee07dc1a788964409255a4b4fae50b98< 8bf659bd54e1f00e34cf5244b1d289c506fa47c0 affected
2.6.26 affected
< 2.6.26 unaffected
6.18.59≤ 6.18.* unaffected
7.2.13≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99211

Vulnerability Information
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Vulnerability Title
netlink: reset skb headers before unicast and multicast filtering
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netlink: reset skb headers before unicast and multicast filtering Socket filters can use SKF_NET_OFF and SKF_LL_OFF to read relative to an skb's network and MAC headers. Netlink producers may reserve headroom without resetting those headers, allowing a receiving socket's filter to read data before the initialized message. For example, IWPM HELLO replies are allocated with dev_alloc_skb(), which reserves NET_SKB_PAD bytes. An unprivileged NETLINK_RDMA user can attach a classic socket filter and disclose this headroom through the length of the delivered reply. The resets in netlink_dump() do not help because IWPM sends a separately allocated skb through netlink_unicast(). Reset both headers before running the receiver's filter in unicast and broadcast delivery, as is already done for dump skbs. This also covers other netlink producers that reserve headroom without changing their allocation or message-building code.
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 b1153f29ee07dc1a788964409255a4b4fae50b98 ~ 06791594274f87c29f1a9f1961d700272716a49d -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2026-99211

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III. Intelligence Information for CVE-2026-99211

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Patches & Fixes for CVE-2026-99211 (3)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux