CVE-2026-53151 (GCVE-0-2026-53151)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-10-19 19:57
VLAI
Title
rxrpc: Fix the ACK parser to extract the SACK table for parsing
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the ACK parser to extract the SACK table for parsing Fix modification of the received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of the buffer in a fragmented UDP packet (the packet would probably have to be deliberately pre-generated as fragmented) when AF_RXRPC tries to extract the contents of the SACK table by copying out the contents of the SACK table into a buffer before attempting to parse AF_RXRPC assumes that it can just call skb_condense() and then validly access the SACK table from skb->data and that it will be a flat buffer - but skb_condense() can silently fail to do anything under some circumstances. Note that whilst rxrpc_input_soft_acks() should be able to parse extended ACKs, the rest of AF_RXRPC doesn't currently support that. Further, there's then no need to call skb_condense() in rxrpc_input_ack(), so don't.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:26 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d57a3a151660902091491ac2633134e1be92557f , < 5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1 (git)
Affected: d57a3a151660902091491ac2633134e1be92557f , < 775c5e89272a2615b72bb84f611ba66fa3b7493e (git)
Affected: d57a3a151660902091491ac2633134e1be92557f , < 566c4c1244de50fbff1f89ff93c9d7b0fc256db4 (git)
Affected: d57a3a151660902091491ac2633134e1be92557f , < 224298450be5c04d2a6ea1c2a94669d7ebf65d00 (git)
Affected: d57a3a151660902091491ac2633134e1be92557f , < 333b6d5bb9f87827ac2639c737bf9613dbae7253 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/775c5e89272a2615b72bb84f611ba66fa3b7493e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-09T21:27:59+00:00",
      "cve": "CVE-2026-53151",
      "id": "CVE-2026-53151",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rxrpc: Fix the ACK parser to extract the SACK table for parsing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53151.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T00:22:14Z",
      "cve": "CVE-2026-53151",
      "id": "CVE-2026-53151",
      "initial_release_date": "2026-06-26T02:12:02Z",
      "product_status:known_affected": "109",
      "product_status:known_not_affected": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53151",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-53151.json",
      "version": "6"
    },
    "vulnrichment": {
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            "metrics": [
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                "other": {
                  "content": {
                    "id": "CVE-2026-53151",
                    "options": [
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                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:26:03.906591Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
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                "descriptions": [
                  {
                    "cweId": "CWE-125",
                    "description": "CWE-125 Out-of-bounds Read",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
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            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:26:04.757Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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                },
                {
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                  "status": "affected",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "6.6.144",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.95",
                  "versionType": "semver"
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                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.36",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.0.*",
                  "status": "unaffected",
                  "version": "7.0.13",
                  "versionType": "semver"
                },
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                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.1",
                  "versionType": "original_commit_for_fix"
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            }
          ],
          "cpeApplicability": [
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                      "vulnerable": true
                    },
                    {
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix the ACK parser to extract the SACK table for parsing\n\nFix modification of the received skbuff in rxrpc_input_soft_acks() and a\npotential incorrect access of the buffer in a fragmented UDP packet (the\npacket would probably have to be deliberately pre-generated as fragmented)\nwhen AF_RXRPC tries to extract the contents of the SACK table by copying\nout the contents of the SACK table into a buffer before attempting to parse\n\nAF_RXRPC assumes that it can just call skb_condense() and then validly\naccess the SACK table from skb-\u003edata and that it will be a flat buffer -\nbut skb_condense() can silently fail to do anything under some\ncircumstances.\n\nNote that whilst rxrpc_input_soft_acks() should be able to parse extended\nACKs, the rest of AF_RXRPC doesn\u0027t currently support that.\n\nFurther, there\u0027s then no need to call skb_condense() in rxrpc_input_ack(),\nso don\u0027t."
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                "baseSeverity": "CRITICAL",
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                "version": "3.1"
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              "scenarios": [
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                  "value": "AV:N - AF_RXRPC processes ACK packets received over UDP from a network peer. A malicious remote peer can send a crafted fragmented RxRPC ACK for an active transmitting call.\nAC:L - The needed fragmented/non-linear skb and ACK fields are attacker-controlled packet properties, and valid call state can be created by participating as the RxRPC peer. No race or condition outside the attacker\u0027s control is required.\nPR:N - The vulnerable parser is reached from network packet receive after protocol matching checks, not after any local privilege check. A remote RxRPC peer does not need an account or kernel privilege on the target.\nUI:N - Once an RxRPC service/client call exists, the malicious ACK is processed automatically by the kernel receive path. No victim user action is needed to parse the packet.\nS:U - The corruption occurs inside the target kernel\u0027s networking/RxRPC memory management context. It does not inherently cross into another security authority such as a hypervisor boundary.\nC:H - The bug performs out-of-bounds reads past the skb linear area into kernel memory while parsing attacker-supplied ACK state. As kernel memory corruption with read exposure potential, confidentiality impact is high.\nI:H - The soft-ACK loop performs read-modify-write shifts through the out-of-bounds pointer, corrupting skb tailroom, skb_shared_info, or adjacent slab memory. This is an out-of-bounds write primitive in kernel memory.\nA:H - Corrupting skb metadata or adjacent kernel objects can readily trigger an oops, panic, or memory-management failure. The crafted ACK can be sent repeatedly to sustain denial of service."
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            },
            {
              "url": "https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-53151",
        "datePublished": "2026-06-25T08:38:36.187Z",
        "dateReserved": "2026-06-09T07:44:35.388Z",
        "dateUpdated": "2026-10-19T19:57:25.967Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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