CVE-2026-53151 (GCVE-0-2026-53151)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-08-05 12:33
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: d57a3a151660902091491ac2633134e1be92557f
Version: d57a3a151660902091491ac2633134e1be92557f
Version: d57a3a151660902091491ac2633134e1be92557f
Version: d57a3a151660902091491ac2633134e1be92557f
Version: d57a3a151660902091491ac2633134e1be92557f
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1",
              "status": "affected",
              "version": "d57a3a151660902091491ac2633134e1be92557f",
              "versionType": "git"
            },
            {
              "lessThan": "775c5e89272a2615b72bb84f611ba66fa3b7493e",
              "status": "affected",
              "version": "d57a3a151660902091491ac2633134e1be92557f",
              "versionType": "git"
            },
            {
              "lessThan": "566c4c1244de50fbff1f89ff93c9d7b0fc256db4",
              "status": "affected",
              "version": "d57a3a151660902091491ac2633134e1be92557f",
              "versionType": "git"
            },
            {
              "lessThan": "224298450be5c04d2a6ea1c2a94669d7ebf65d00",
              "status": "affected",
              "version": "d57a3a151660902091491ac2633134e1be92557f",
              "versionType": "git"
            },
            {
              "lessThan": "333b6d5bb9f87827ac2639c737bf9613dbae7253",
              "status": "affected",
              "version": "d57a3a151660902091491ac2633134e1be92557f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:31.692Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1"
        },
        {
          "url": "https://git.kernel.org/stable/c/775c5e89272a2615b72bb84f611ba66fa3b7493e"
        },
        {
          "url": "https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4"
        },
        {
          "url": "https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00"
        },
        {
          "url": "https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253"
        }
      ],
      "title": "rxrpc: Fix the ACK parser to extract the SACK table for parsing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53151",
    "datePublished": "2026-06-25T08:38:36.187Z",
    "dateReserved": "2026-06-09T07:44:35.388Z",
    "dateUpdated": "2026-08-05T12:33:31.692Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.