CVE-2026-23459 (GCVE-0-2026-23459)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-09-07 15:44
VLAI
Title
ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS
Summary
In the Linux kernel, the following vulnerability has been resolved: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which call iptunnel_xmit_stats(). iptunnel_xmit_stats() was assuming tunnels were only using NETDEV_PCPU_STAT_TSTATS. @syncp offset in pcpu_sw_netstats and pcpu_dstats is different. 32bit kernels would either have corruptions or freezes if the syncp sequence was overwritten. This patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid a potential cache line miss since iptunnel_xmit_stats() needs to read it.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cb1c1f3b7ef908408064734fb6bdaf5811b8b84c , < e40e2d11ced8119d3e4469ebe91264bc1cf71530 (git)
Affected: be226352e8dc77d3313c096b2d8e7f69bf6980fc , < 5d562153b4719234227f99c2fb529f98a6a44d15 (git)
Affected: be226352e8dc77d3313c096b2d8e7f69bf6980fc , < 0d087d00161f562d5047cc4009bb0c6a19daf9f1 (git)
Affected: be226352e8dc77d3313c096b2d8e7f69bf6980fc , < 8431c602f551549f082bbfa67f3003f2d8e3e132 (git)
Affected: 1db9041e91ac574f1cecc0e98e69ac35832e8088 (git)
Affected: 6.6.153 , < 6.7 (semver)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nip_tunnel: adaptar iptunnel_xmit_stats() a NETDEV_PCPU_STAT_DSTATS\n\nLos commits culpables olvidaron que vxlan/geneve usan udp_tunnel[6]_xmit_skb() que llama a iptunnel_xmit_stats().\n\niptunnel_xmit_stats() asum\u00eda que los t\u00faneles solo usaban NETDEV_PCPU_STAT_TSTATS.\n\nEl desplazamiento @syncp en pcpu_sw_netstats y pcpu_dstats es diferente.\n\nLos kernels de 32 bits tendr\u00edan o bien corrupciones o congelamientos si la secuencia syncp era sobrescrita.\n\nEste parche tambi\u00e9n mueve pcpu_stat_type m\u00e1s cerca de dev -\u003e {t,d}stats para evitar una posible p\u00e9rdida de l\u00ednea de cach\u00e9 ya que iptunnel_xmit_stats() necesita leerlo."
          }
        ],
        "id": "CVE-2026-23459",
        "lastModified": "2026-09-07T16:17:27.923",
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                "baseScore": 8.2,
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                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
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                "value": "NVD-CWE-noinfo"
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            "source": "nvd@nist.gov",
            "type": "Primary"
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T10:58:25+00:00",
      "cve": "CVE-2026-23459",
      "id": "CVE-2026-23459",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23459.json",
      "version": "3"
    }
  }
}



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