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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 179a5b2171573d94a25c9aa8e1c9f9ac352ad316, 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269, 753e5cdcca5474d230d62bb3489e5168ab27c272.

Low priority for now. Upgrade to Linux Linux 179a5b2171573d94a25c9aa8e1c9f9ac352ad316, 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269, 753e5cdcca5474d230d62bb3489e5168ab27c272 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.10affected
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before 753e5cdcca5474d230d62bb3489e5168ab27c272affected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before c488071c3441fa34f5a87cd6c12ce2cc6304f20eaffected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before a38c0eb447e2dd0120a2ebcdba470f9505ac8907affected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before de2b2004e16f2930eb689175e2c1998b0a68d499affected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before 7d043e24520a273c362be5dd7d9c82796879a49baffected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before 7cf561843ed0ad57501892a65abb77957e6c800faffected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before 179a5b2171573d94a25c9aa8e1c9f9ac352ad316affected · git
    • 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 and later · before 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269affected · git
    • before 4.10not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90158Sep 17, 2026 · m68k: nfcon: Do not call console_is_registered() in nfcon_device()
    0Monitor
  • ← EarlierCVE-2026-90159Sep 17, 2026 · bpf: Disallow bpf_{g,s}etsockopt() in cgroup UNIX getname hooks
    0Monitor
  • Later →CVE-2026-90161Sep 17, 2026 · erofs: fix interlaced ztailpacking pclusters
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux179a5b2171573d94a25c9aa8e1c9f9ac352ad316Vendor (CNA)
Linux Linux5fe7007aed9ad069b2bd77e5d0c875c64f5c0269Vendor (CNA)
Linux Linux753e5cdcca5474d230d62bb3489e5168ab27c272Vendor (CNA)
Linux Linux7cf561843ed0ad57501892a65abb77957e6c800fVendor (CNA)
Linux Linux7d043e24520a273c362be5dd7d9c82796879a49bVendor (CNA)
Linux Linuxa38c0eb447e2dd0120a2ebcdba470f9505ac8907Vendor (CNA)
Linux Linuxc488071c3441fa34f5a87cd6c12ce2cc6304f20eVendor (CNA)
Linux Linuxde2b2004e16f2930eb689175e2c1998b0a68d499Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records