CVE-2026-46039 (GCVE-0-2026-46039)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-08-05 12:29
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: rxgk: Fix potential integer overflow in length check Fix potential integer overflow in rxgk_extract_token() when checking the length of the ticket. Rather than rounding up the value to be tested (which might overflow), round down the size of the available data.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2429a197648178cd4dc930a9d87c13c547460564
Version: 2429a197648178cd4dc930a9d87c13c547460564
Version: 2429a197648178cd4dc930a9d87c13c547460564
Version: 71571e187106631a8127f2dde780f35caa358d33
Version: 6.16.9   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxgk_app.c",
            "net/rxrpc/rxgk_common.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "43222ac484f93b3ec2d240a7575e1cedd31f5fa4",
              "status": "affected",
              "version": "2429a197648178cd4dc930a9d87c13c547460564",
              "versionType": "git"
            },
            {
              "lessThan": "183d37f12d1c8ed24a5bfc7addad05510da22a94",
              "status": "affected",
              "version": "2429a197648178cd4dc930a9d87c13c547460564",
              "versionType": "git"
            },
            {
              "lessThan": "6929350080f4da292d111a3b33e53138fee51cec",
              "status": "affected",
              "version": "2429a197648178cd4dc930a9d87c13c547460564",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "71571e187106631a8127f2dde780f35caa358d33",
              "versionType": "git"
            },
            {
              "lessThan": "6.17",
              "status": "affected",
              "version": "6.16.9",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/rxgk_app.c",
            "net/rxrpc/rxgk_common.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "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": "6.18.27",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.4",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.16.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxgk: Fix potential integer overflow in length check\n\nFix potential integer overflow in rxgk_extract_token() when checking the\nlength of the ticket.  Rather than rounding up the value to be tested\n(which might overflow), round down the size of the available data."
        }
      ],
      "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 - The bug is triggered by a crafted RxRPC RESPONSE packet received over UDP and parsed by the in-kernel rxgk server-side handshake (`rxgk_verify_response`); no local access is needed.\nAC:L - The integer overflow is deterministic for fixed `ticket_len` values (0xFFFFFFFD\u20130xFFFFFFFF), and all packet fields including the enumerable kvno/enctype used for the server-key lookup are attacker-controlled, so the attacker reliably triggers the OOB.\nPR:N - The RESPONSE packet is processed during the security handshake before the client is authenticated; the attacker needs no credentials, only a kvno/enctype matching a server key (a public, guessable identifier).\nUI:N - The rxrpc service processes incoming RESPONSE packets automatically with no victim interaction.\nS:U - The corruption is confined to the kernel\u0027s own memory within the same security authority; no VM/IOMMU boundary is crossed.\nC:H - The truncated negative length yields a ~4 GB scatterlist entry, causing an enormous out-of-bounds read of adjacent kernel memory during AEAD decryption, well beyond a few bounded bytes.\nI:H - The AEAD decrypt is in-place (src==dst scatterlist), so plaintext is written back across the oversized region, corrupting adjacent kernel heap memory (out-of-bounds write) before the fault.\nA:H - Reading/writing a ~4 GB region from a small skb buffer reliably hits unmapped memory, producing a kernel oops/panic (remote, unauthenticated DoS)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:17.995Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/43222ac484f93b3ec2d240a7575e1cedd31f5fa4"
        },
        {
          "url": "https://git.kernel.org/stable/c/183d37f12d1c8ed24a5bfc7addad05510da22a94"
        },
        {
          "url": "https://git.kernel.org/stable/c/6929350080f4da292d111a3b33e53138fee51cec"
        }
      ],
      "title": "rxgk: Fix potential integer overflow in length check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46039",
    "datePublished": "2026-05-27T12:56:51.317Z",
    "dateReserved": "2026-05-13T15:03:33.093Z",
    "dateUpdated": "2026-08-05T12:29:17.995Z",
    "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.