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CVE-2026-90160— lwt_bpf: Restore reserved headroom after xmit program

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： lwt_bpf：在 xmit 程序执行后恢复保留的头部空间（headroom） 在 LWT 发送前，会将 skb 扩展至 。随后，LWT_XMIT BPF 程序可以修改 skb 的头部，并仍返回 。因此， 会在 skb 继续进入邻居层输出之前，重新检查剩余的头部空间。 该重新检查使用 。但对于邻居缓存头部路径，这一判断是不够的： 使用对齐后的 大小来复制缓存的硬件头部，短头部时使用 ，否则使用 。 在以太网情况下， 为 14 字节，但复制缓存头部需要 16 字节。如果

AI Predicted 5.3 Difficulty: Moderate EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 753e5cdcca5474d230d62bb3489e5168ab27c272 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< c488071c3441fa34f5a87cd6c12ce2cc6304f20e affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< a38c0eb447e2dd0120a2ebcdba470f9505ac8907 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< de2b2004e16f2930eb689175e2c1998b0a68d499 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 7d043e24520a273c362be5dd7d9c82796879a49b affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 7cf561843ed0ad57501892a65abb77957e6c800f affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 179a5b2171573d94a25c9aa8e1c9f9ac352ad316 affected
3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2< 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269 affected
… +10 more rows
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I. Basic Information for CVE-2026-90160

Vulnerability Information
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Vulnerability Title
lwt_bpf: Restore reserved headroom after xmit program
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lwt_bpf: Restore reserved headroom after xmit program ip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT xmit. An LWT_XMIT BPF program can then modify the skb head and still return BPF_OK, so bpf_xmit() rechecks the remaining headroom before the skb continues to neighbour output. That recheck uses dst->dev->hard_header_len. This is not enough for the neighbour cached-header path: neigh_hh_output() copies the cached hardware header using the aligned hh_cache size, HH_DATA_MOD for short headers or HH_DATA_ALIGN(hh_len) otherwise. On Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If an LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can still have 15 bytes of headroom after the program. The existing check accepts that, after which neigh_hh_output() hits its headroom warning and drops the skb. Use LL_RESERVED_SPACE(dst->dev) in the post-BPF headroom check to match the reservation made before LWT xmit.
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 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 ~ 753e5cdcca5474d230d62bb3489e5168ab27c272 -
Linux Linux 4.10 -

II. Public POCs for CVE-2026-90160

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III. Intelligence Information for CVE-2026-90160

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Patches & Fixes for CVE-2026-90160 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90160

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