CVE-2026-43038 (GCVE-0-2026-43038)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-08-05 12:25
VLAI
Title
ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() Sashiko AI-review observed: In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet where its cb contains an IPv4 inet_skb_parm. When skb is cloned into skb2 and passed to icmp6_send(), it uses IP6CB(skb2). IP6CB interprets the IPv4 inet_skb_parm as an inet6_skb_parm. The cipso offset in inet_skb_parm.opt directly overlaps with dsthao in inet6_skb_parm at offset 18. If an attacker sends a forged ICMPv4 error with a CIPSO IP option, dsthao would be a non-zero offset. Inside icmp6_send(), mip6_addr_swap() is called and uses ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO). This would scan the inner, attacker-controlled IPv6 packet starting at that offset, potentially returning a fake TLV without checking if the remaining packet length can hold the full 18-byte struct ipv6_destopt_hao. Could mip6_addr_swap() then perform a 16-byte swap that extends past the end of the packet data into skb_shared_info? Should the cb array also be cleared in ip6_err_gen_icmpv6_unreach() and ip6ip6_err() to prevent this? This patch implements the first suggestion. I am not sure if ip6ip6_err() needs to be changed. A separate patch would be better anyway.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
References
URL Tags
https://git.kernel.org/stable/c/c438ba010171b70ba…
https://git.kernel.org/stable/c/0452b6526b2f54b24…
https://git.kernel.org/stable/c/a4437faf135da293d…
https://git.kernel.org/stable/c/3d5127d998de617b1…
https://git.kernel.org/stable/c/e41953e7d118e2702…
https://git.kernel.org/stable/c/a2edbb6393972a021…
https://git.kernel.org/stable/c/1ceeebd5bd6d855b1…
https://git.kernel.org/stable/c/86ab3e55673a7a49a…
https://access.redhat.com/security/cve/CVE-2026-43038 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2464397 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:24343 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30129 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22940 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23237 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23224 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30848 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25121 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26535 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25533 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22964 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25120 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22900 vendor-advisoryx_refsource_REDHAT
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
Impacted products
Vendor Product Version
Linux Linux Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < c438ba010171b70bad22fc18b1d5bdc3627476e8 (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < 0452b6526b2f54b2413b9cb4ff1ea2ac542c99c7 (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < a4437faf135da293d16fcc4cc607316742bd0ebb (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < 3d5127d998de617b130aae96b138dba22ac6a8a7 (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < e41953e7d118e2702bcb217879c173d9d1d3cd4e (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < a2edbb6393972a02114b6003953a5cef3104fada (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < 1ceeebd5bd6d855b17a5df625109bfe29129d7cf (git)
Affected: ca15a078bd907df5fc1c009477869c5cbde3b753 , < 86ab3e55673a7a49a841838776f1ab18d23a67b5 (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:6.12.0-211.28.1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:6.12.0-55.77.1.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.132.1.rt7.473.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.132.1.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:4.18.0-305.194.1.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:4.18.0-305.194.1.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.18.0-372.195.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.18.0-372.195.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.18.0-477.145.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.18.0-477.145.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.19.1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.174.1.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.174.1.rt14.459.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:5.14.0-427.129.1.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:5.14.0-570.119.1.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43038\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-01T15:16:48.533\",\"lastModified\":\"2026-07-15T02:21:41.223\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach()\\n\\nSashiko AI-review observed:\\n\\n  In ip6_err_gen_icmpv6_unreach(), the skb is an outer IPv4 ICMP error packet\\n  where its cb contains an IPv4 inet_skb_parm. When skb is cloned into skb2\\n  and passed to icmp6_send(), it uses IP6CB(skb2).\\n\\n  IP6CB interprets the IPv4 inet_skb_parm as an inet6_skb_parm. The cipso\\n  offset in inet_skb_parm.opt directly overlaps with dsthao in inet6_skb_parm\\n  at offset 18.\\n\\n  If an attacker sends a forged ICMPv4 error with a CIPSO IP option, dsthao\\n  would be a non-zero offset. Inside icmp6_send(), mip6_addr_swap() is called\\n  and uses ipv6_find_tlv(skb, opt-\u003edsthao, IPV6_TLV_HAO).\\n\\n  This would scan the inner, attacker-controlled IPv6 packet starting at that\\n  offset, potentially returning a fake TLV without checking if the remaining\\n  packet length can hold the full 18-byte struct ipv6_destopt_hao.\\n\\n  Could mip6_addr_swap() then perform a 16-byte swap that extends past the end\\n  of the packet data into skb_shared_info?\\n\\n  Should the cb array also be cleared in ip6_err_gen_icmpv6_unreach() and\\n  ip6ip6_err() to prevent this?\\n\\nThis patch implements the first suggestion.\\n\\nI am not sure if ip6ip6_err() needs to be changed.\\nA separate patch would be better 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-30T03:58:16+00:00",
      "cve": "CVE-2026-43038",
      "id": "CVE-2026-43038",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:fixed": "1980",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: icmp: clear skb2-\u003ecb[] in ip6_err_gen_icmpv6_unreach()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43038.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-03T23:45:50Z",
      "cve": "CVE-2026-43038",
      "id": "CVE-2026-43038",
      "initial_release_date": "2026-05-06T01:41:02Z",
      "product_status:first_fixed": "26",
      "product_status:known_affected": "468",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "694",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43038",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43038.json",
      "version": "38"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.


Detection rules are retrieved from Rulezet.