Vulnerability-Lookup

GHSA-MJCM-HF7X-HM3W

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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

rxrpc: Fix potential UAF after skb_unshare() failure

If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops.

Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided.

And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45998"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:17Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread())\nwill be NULL\u0027d out.  This will likely cause the call to\ntrace_rxrpc_rx_done() to oops.\n\nFix this by moving the unsharing down to where rxrpc_input_call_event()\ncalls rxrpc_input_call_packet().  There are a number of places prior to\nthat where we ignore DATA packets for a variety of reasons (such as the\ncall already being complete) for which an unshare is then avoided.\n\nAnd with that, rxrpc_input_packet() doesn\u0027t need to take a pointer to the\npointer to the packet, so change that to just a pointer.",
  "id": "GHSA-mjcm-hf7x-hm3w",
  "modified": "2026-05-27T15:33:20Z",
  "published": "2026-05-27T15:33:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45998"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-45998 (GCVE-0-2026-45998)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:55 – Updated: 2026-05-27 12:55

Title

rxrpc: Fix potential UAF after skb_unshare() failure

Summary

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential UAF after skb_unshare() failure If skb_unshare() fails to unshare a packet due to allocation failure in rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread()) will be NULL'd out. This will likely cause the call to trace_rxrpc_rx_done() to oops. Fix this by moving the unsharing down to where rxrpc_input_call_event() calls rxrpc_input_call_packet(). There are a number of places prior to that where we ignore DATA packets for a variety of reasons (such as the call already being complete) for which an unshare is then avoided. And with that, rxrpc_input_packet() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/e3bf143b1e98fb3d6…
https://git.kernel.org/stable/c/bf20f46d94f1db38e…
https://git.kernel.org/stable/c/996b0487b3cdda4c9…
https://git.kernel.org/stable/c/8fde6296c4d4da2be…
https://git.kernel.org/stable/c/1f2740150f904bfa6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 , < e3bf143b1e98fb3d6d9e6825bcd683974d478e8c (git) Affected: 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 , < bf20f46d94f1db38e6ffc0ca204a5fe0de01b495 (git) Affected: 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 , < 996b0487b3cdda4c91811dbb1c9564626bc840bd (git) Affected: 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 , < 8fde6296c4d4da2be7ab761305ab7f232b94eefd (git) Affected: 2d1faf7a0ca3c0b327cf064c80e4e775532c9319 , < 1f2740150f904bfa60e4bad74d65add3ccb5e7f8 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/rxrpc.h",
            "net/rxrpc/ar-internal.h",
            "net/rxrpc/call_event.c",
            "net/rxrpc/io_thread.c",
            "net/rxrpc/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
            },
            {
              "lessThan": "8fde6296c4d4da2be7ab761305ab7f232b94eefd",
              "status": "affected",
              "version": "2d1faf7a0ca3c0b327cf064c80e4e775532c9319",
              "versionType": "git"
            },
            {
              "lessThan": "1f2740150f904bfa60e4bad74d65add3ccb5e7f8",
              "status": "affected",
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              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/rxrpc.h",
            "net/rxrpc/ar-internal.h",
            "net/rxrpc/call_event.c",
            "net/rxrpc/io_thread.c",
            "net/rxrpc/skbuff.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": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "6.2",
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                },
                {
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                },
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.2",
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                }
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential UAF after skb_unshare() failure\n\nIf skb_unshare() fails to unshare a packet due to allocation failure in\nrxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread())\nwill be NULL\u0027d out.  This will likely cause the call to\ntrace_rxrpc_rx_done() to oops.\n\nFix this by moving the unsharing down to where rxrpc_input_call_event()\ncalls rxrpc_input_call_packet().  There are a number of places prior to\nthat where we ignore DATA packets for a variety of reasons (such as the\ncall already being complete) for which an unshare is then avoided.\n\nAnd with that, rxrpc_input_packet() doesn\u0027t need to take a pointer to the\npointer to the packet, so change that to just a pointer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:55:52.756Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e3bf143b1e98fb3d6d9e6825bcd683974d478e8c"
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          "url": "https://git.kernel.org/stable/c/bf20f46d94f1db38e6ffc0ca204a5fe0de01b495"
        },
        {
          "url": "https://git.kernel.org/stable/c/996b0487b3cdda4c91811dbb1c9564626bc840bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fde6296c4d4da2be7ab761305ab7f232b94eefd"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f2740150f904bfa60e4bad74d65add3ccb5e7f8"
        }
      ],
      "title": "rxrpc: Fix potential UAF after skb_unshare() failure",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45998",
    "datePublished": "2026-05-27T12:55:52.756Z",
    "dateReserved": "2026-05-13T15:03:33.091Z",
    "dateUpdated": "2026-05-27T12:55:52.756Z",
    "state": "PUBLISHED"
  },
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  "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.

Detection rules are retrieved from Rulezet.

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GHSA-MJCM-HF7X-HM3W

CVE-2026-45998 (GCVE-0-2026-45998)

Tags

Sightings

Nomenclature