CVE-2026-90160 (GCVE-0-2026-90160)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
VLAI
Title
lwt_bpf: Restore reserved headroom after xmit program
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 753e5cdcca5474d230d62bb3489e5168ab27c272 (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < c488071c3441fa34f5a87cd6c12ce2cc6304f20e (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < a38c0eb447e2dd0120a2ebcdba470f9505ac8907 (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < de2b2004e16f2930eb689175e2c1998b0a68d499 (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 7d043e24520a273c362be5dd7d9c82796879a49b (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 7cf561843ed0ad57501892a65abb77957e6c800f (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 179a5b2171573d94a25c9aa8e1c9f9ac352ad316 (git)
Affected: 3a0af8fd61f90920f6fa04e4f1e9a6a73c1b4fd2 , < 5fe7007aed9ad069b2bd77e5d0c875c64f5c0269 (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst-\u003edev-\u003ehard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst-\u003edev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:58.842Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/753e5cdcca5474d230d62bb3489e5168ab27c272"
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          "url": "https://git.kernel.org/stable/c/c488071c3441fa34f5a87cd6c12ce2cc6304f20e"
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      "title": "lwt_bpf: Restore reserved headroom after xmit program",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90160",
    "datePublished": "2026-09-17T16:06:51.806Z",
    "dateReserved": "2026-09-11T19:38:34.790Z",
    "dateUpdated": "2026-10-19T08:58:58.842Z",
    "state": "PUBLISHED"
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      "date": "2026-10-24",
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlwt_bpf: Restore reserved headroom after xmit program\n\nip_finish_output2() expands an skb to LL_RESERVED_SPACE(dev) before LWT\nxmit. An LWT_XMIT BPF program can then modify the skb head and still\nreturn BPF_OK, so bpf_xmit() rechecks the remaining headroom before the\nskb continues to neighbour output.\n\nThat recheck uses dst-\u003edev-\u003ehard_header_len. This is not enough for the\nneighbour cached-header path: neigh_hh_output() copies the cached hardware\nheader using the aligned hh_cache size, HH_DATA_MOD for short headers or\nHH_DATA_ALIGN(hh_len) otherwise.\n\nOn Ethernet, hard_header_len is 14 but the cached copy needs 16 bytes. If\nan LWT_XMIT BPF program calls bpf_skb_change_head(skb, 1, 0), the skb can\nstill have 15 bytes of headroom after the program. The existing check\naccepts that, after which neigh_hh_output() hits its headroom warning and\ndrops the skb.\n\nUse LL_RESERVED_SPACE(dst-\u003edev) in the post-BPF headroom check to match\nthe reservation made before LWT xmit."
          }
        ],
        "id": "CVE-2026-90160",
        "lastModified": "2026-10-19T09:19:05.990",
        "metrics": {},
        "published": "2026-09-17T17:17:09.190",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-13T14:47:29+00:00",
      "cve": "CVE-2026-90160",
      "id": "CVE-2026-90160",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "235",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: lwt_bpf: Restore reserved headroom after xmit program",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90160.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-20T00:45:13Z",
      "cve": "CVE-2026-90160",
      "id": "CVE-2026-90160",
      "initial_release_date": "2026-09-21T16:31:57Z",
      "product_status:known_affected": "342",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90160",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90160.json",
      "version": "4"
    }
  }
}



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  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.