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GHSA-P3F2-6553-5MWV

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix the reception of a reply packet before data transmission

Fix rxrpc_receiving_reply() to handle the reception of an apparent reply DATA packet before rxrpc has had a chance to send any request DATA packets on a client call by checking to see if the call has been exposed yet by sending the first packet.

Without this, rxrpc_rotate_tx_window() might oops.

Also fix rxrpc_rotate_tx_window() to handle the Tx queue being empty by changing the do...while loop into a while loop, just in case a call is abnormally terminated by an early reply before the last request packet is transmitted.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74429"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:45Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix the reception of a reply packet before data transmission\n\nFix rxrpc_receiving_reply() to handle the reception of an apparent reply\nDATA packet before rxrpc has had a chance to send any request DATA packets\non a client call by checking to see if the call has been exposed yet by\nsending the first packet.\n\nWithout this, rxrpc_rotate_tx_window() might oops.\n\nAlso fix rxrpc_rotate_tx_window() to handle the Tx queue being empty by\nchanging the do...while loop into a while loop, just in case a call is\nabnormally terminated by an early reply before the last request packet is\ntransmitted.",
  "id": "GHSA-p3f2-6553-5mwv",
  "modified": "2026-08-17T06:33:44Z",
  "published": "2026-08-15T06:32:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74429"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a58e33405acd2584e730c1da72635f822ada6b49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e220ae559e5a0fc33e41ec6a348ea50387cb8b0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9be514984471ff0003738b2e1efed12bc3433ff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74429 (GCVE-0-2026-74429)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:47

Title

rxrpc: Fix the reception of a reply packet before data transmission

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the reception of a reply packet before data transmission Fix rxrpc_receiving_reply() to handle the reception of an apparent reply DATA packet before rxrpc has had a chance to send any request DATA packets on a client call by checking to see if the call has been exposed yet by sending the first packet. Without this, rxrpc_rotate_tx_window() might oops. Also fix rxrpc_rotate_tx_window() to handle the Tx queue being empty by changing the do...while loop into a while loop, just in case a call is abnormally terminated by an early reply before the last request packet is transmitted.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/f9be514984471ff00…
https://git.kernel.org/stable/c/e220ae559e5a0fc33…
https://git.kernel.org/stable/c/a58e33405acd2584e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b341a0263b1b804d329f864c2dc24815364510ec , < f9be514984471ff0003738b2e1efed12bc3433ff (git) Affected: b341a0263b1b804d329f864c2dc24815364510ec , < e220ae559e5a0fc33e41ec6a348ea50387cb8b0f (git) Affected: b341a0263b1b804d329f864c2dc24815364510ec , < a58e33405acd2584e730c1da72635f822ada6b49 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "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": "f9be514984471ff0003738b2e1efed12bc3433ff",
              "status": "affected",
              "version": "b341a0263b1b804d329f864c2dc24815364510ec",
              "versionType": "git"
            },
            {
              "lessThan": "e220ae559e5a0fc33e41ec6a348ea50387cb8b0f",
              "status": "affected",
              "version": "b341a0263b1b804d329f864c2dc24815364510ec",
              "versionType": "git"
            },
            {
              "lessThan": "a58e33405acd2584e730c1da72635f822ada6b49",
              "status": "affected",
              "version": "b341a0263b1b804d329f864c2dc24815364510ec",
              "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": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix the reception of a reply packet before data transmission\n\nFix rxrpc_receiving_reply() to handle the reception of an apparent reply\nDATA packet before rxrpc has had a chance to send any request DATA packets\non a client call by checking to see if the call has been exposed yet by\nsending the first packet.\n\nWithout this, rxrpc_rotate_tx_window() might oops.\n\nAlso fix rxrpc_rotate_tx_window() to handle the Tx queue being empty by\nchanging the do...while loop into a while loop, just in case a call is\nabnormally terminated by an early reply before the last request packet is\ntransmitted."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is reached when a remote UDP RxRPC DATA reply is processed on an established client call via rxrpc_encap_rcv(), rxrpc_input_packet_on_conn(), and rxrpc_input_data(); a malicious or compromised AFS/RxRPC server peer can send that early reply over the network to any kAFS/AF_RXRPC client.\nAC:L - The remote server controls both sides of the timing race\u2014it can send a reply DATA packet immediately after the client call is live on the channel but before RXRPC_CALL_EXPOSED/first transmit\u2014and can retry on every RPC without depending on memory layout or other uncontrollable conditions.\nPR:N - No local credentials or kernel capabilities on the victim are required; exploitation only needs the attacker to act as the established RxRPC server peer able to send call-bound DATA packets on an active client connection after the normal security handshake.\nUI:N - Once the victim host has an active client call (normal kAFS file access or AF_RXRPC sendmsg), the kernel rxrpc I/O thread autonomously processes the attacker\u0027s early reply with no further interactive victim action at exploit time.\nS:U - The oops in rxrpc_rotate_tx_window() affects only kernel memory and threads within the same security authority on the client host; it does not cross VM, container, IOMMU, or sandbox boundaries.\nC:N - The defect is a NULL dereference from a do...while loop that executes once on an empty Tx queue when seq exceeds tx_top (tq or tq-\u003ebufs[ix] is NULL); this is a pure crash path, not an out-of-bounds read or use-after-free disclosure primitive.\nI:N - No attacker-controlled memory is written; the failure dereferences NULL or uninitialized txqueue entries before any buffer rotation or put_txbuf logic completes, yielding only a kernel fault without integrity modification capability.\nA:H - Without the fix, rxrpc_rotate_tx_window() oopses the rxrpc I/O kernel thread that services all RxRPC/AFS traffic on that endpoint; a malicious server can trigger this on every client RPC call, causing repeated kernel crashes or hangs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:47:04.412Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f9be514984471ff0003738b2e1efed12bc3433ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/e220ae559e5a0fc33e41ec6a348ea50387cb8b0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a58e33405acd2584e730c1da72635f822ada6b49"
        }
      ],
      "title": "rxrpc: Fix the reception of a reply packet before data transmission",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74429",
    "datePublished": "2026-08-15T05:59:30.286Z",
    "dateReserved": "2026-08-15T05:44:03.895Z",
    "dateUpdated": "2026-08-17T05:47:04.412Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-P3F2-6553-5MWV

CVE-2026-74429 (GCVE-0-2026-74429)

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