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CVE-2026-53002 (GCVE-0-2026-53002)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-09-10 12:04
VLAI
Title
netfilter: conntrack: remove sprintf usage
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: remove sprintf usage Replace it with scnprintf, the buffer sizes are expected to be large enough to hold the result, no need for snprintf+overflow check. Increase buffer size in mangle_content_len() while at it. BUG: KASAN: stack-out-of-bounds in vsnprintf+0xea5/0x1270 Write of size 1 at addr [..] vsnprintf+0xea5/0x1270 sprintf+0xb1/0xe0 mangle_content_len+0x1ac/0x280 nf_nat_sdp_session+0x1cc/0x240 process_sdp+0x8f8/0xb80 process_invite_request+0x108/0x2b0 process_sip_msg+0x5da/0xf50 sip_help_tcp+0x45e/0x780 nf_confirm+0x34d/0x990 [..]
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < 2f793ba78470a99f40389b7dc60a81d9f5ad3956 (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < 6bbf829b4c1b44c941c47dd0d710f1393258f3d5 (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < ab64e61c9323fa6de21bd20da1ddb29a0fb65d34 (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < 1c9fb8aeed06790d42cdcd00f6c3ce0b9e926c1e (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < a8e0a32a23d3f34862af3b4da792ecb3a891a9a3 (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < 8e3be0d12615a173fe260cd42753ca7a001acbf2 (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < c08ff52e44945e6ef4ce0790f49ea761b060c45b (git)
Affected: 9fafcd7b203229c3f3893a475741afc27e276306 , < 6e7066bdb481a87fe88c4fa563e348c03b2d373d (git)
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Linux Linux Affected: 2.6.20
Unaffected: 0 , < 2.6.20 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.160.1.rt7.501.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.160.1.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.46.1.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 10     cpe:/o:redhat:enterprise_linux:10
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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 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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              "value": "AV:N - The vulnerable SIP NAT helper is reached from network packet processing when a target acts as a SIP-aware NAT/conntrack gateway. A remote peer can send crafted SIP/SDP traffic through that configured path.\nAC:L - No race or hard-to-control state is required; the attacker controls the SIP/SDP payload and can drive the oversized Content-Length recomputation. The needed NAT/helper configuration is a normal deployment condition for SIP ALG/firewall use.\nPR:N - In the remote deployment scenario, the attacker only sends network traffic and does not need local credentials or administrative privileges on the target. Local helper setup would require CAP_NET_ADMIN, but that is not required when attacking an already configured SIP NAT gateway.\nUI:N - No victim user action is required once the vulnerable helper is active. Packet processing happens automatically in the netfilter conntrack/NAT path.\nS:U - The corruption occurs inside the Linux kernel networking stack and impacts the same kernel security authority. There is no VM, IOMMU, or cross-authority boundary change.\nC:H - This is kernel stack memory corruption from an out-of-bounds sprintf write. Even though the report shows a KASAN crash, such memory corruption can plausibly be leveraged toward broader kernel compromise, so the higher severity value is appropriate.\nI:H - The bug is an out-of-bounds write on the kernel stack in packet processing. Kernel memory corruption can plausibly alter control data or enable code execution, so integrity impact is high.\nA:H - The reported failure is a KASAN stack-out-of-bounds write in kernel context and can crash or panic the system. The crafted traffic can be sent repeatedly to sustain denial of service."
            }
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        "dateUpdated": "2026-08-05T12:32:32.201Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/6bbf829b4c1b44c941c47dd0d710f1393258f3d5"
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        },
        {
          "url": "https://git.kernel.org/stable/c/6e7066bdb481a87fe88c4fa563e348c03b2d373d"
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      ],
      "title": "netfilter: conntrack: remove sprintf usage",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53002",
    "datePublished": "2026-06-24T16:29:14.391Z",
    "dateReserved": "2026-06-09T07:44:35.377Z",
    "dateUpdated": "2026-09-10T12:04:52.973Z",
    "state": "PUBLISHED"
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      "date": "2026-09-10",
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    },
    "microsoft_vex": {
      "current_release_date": "2026-07-09T14:42:38.000Z",
      "cve": "CVE-2026-53002",
      "id": "msrc_CVE-2026-53002",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: conntrack: remove sprintf usage",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53002.json",
      "version": "3"
    },
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-10T03:16:36+00:00",
      "cve": "CVE-2026-53002",
      "id": "CVE-2026-53002",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:fixed": "453",
      "product_status:known_affected": "126",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: conntrack: remove sprintf usage",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53002.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:35:44Z",
      "cve": "CVE-2026-53002",
      "id": "CVE-2026-53002",
      "initial_release_date": "2026-06-26T02:13:56Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "695",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53002",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53002.json",
      "version": "11"
    }
  }
}



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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.