github - ghsa-8q2m-46mc-pjw4

GHSA-8Q2M-46MC-PJW4

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-02-03 18:30

Details

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

net: bridge: fix vlan tunnel dst null pointer dereference

This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47223"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:11Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix vlan tunnel dst null pointer dereference\n\nThis patch fixes a tunnel_dst null pointer dereference due to lockless\naccess in the tunnel egress path. When deleting a vlan tunnel the\ntunnel_dst pointer is set to NULL without waiting a grace period (i.e.\nwhile it\u0027s still usable) and packets egressing are dereferencing it\nwithout checking. Use READ/WRITE_ONCE to annotate the lockless use of\ntunnel_id, use RCU for accessing tunnel_dst and make sure it is read\nonly once and checked in the egress path. The dst is already properly RCU\nprotected so we don\u0027t need to do anything fancy than to make sure\ntunnel_id and tunnel_dst are read only once and checked in the egress path.",
  "id": "GHSA-8q2m-46mc-pjw4",
  "modified": "2025-02-03T18:30:37Z",
  "published": "2024-05-21T15:31:39Z",
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CVE-2021-47223 (GCVE-0-2021-47223)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2025-05-04 07:06

Summary

In the Linux kernel, the following vulnerability has been resolved: net: bridge: fix vlan tunnel dst null pointer dereference This patch fixes a tunnel_dst null pointer dereference due to lockless access in the tunnel egress path. When deleting a vlan tunnel the tunnel_dst pointer is set to NULL without waiting a grace period (i.e. while it's still usable) and packets egressing are dereferencing it without checking. Use READ/WRITE_ONCE to annotate the lockless use of tunnel_id, use RCU for accessing tunnel_dst and make sure it is read only once and checked in the egress path. The dst is already properly RCU protected so we don't need to do anything fancy than to make sure tunnel_id and tunnel_dst are read only once and checked in the egress path.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ad7feefe7164892db…
	https://git.kernel.org/stable/c/24a6e55f17aa123bc…
	https://git.kernel.org/stable/c/a2241e62f6b4a774d…
	https://git.kernel.org/stable/c/fe0448a3fad365a74…
	https://git.kernel.org/stable/c/abb02e05cb1c0a30d…
	https://git.kernel.org/stable/c/58e2071742e38f29f…

Impacted products

Vendor

Product

Version

Linux

Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < ad7feefe7164892db424c45687472db803d87f79 (git)
Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < 24a6e55f17aa123bc1fc54b7d3c410b41bc16530 (git)
Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c (git)
Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < fe0448a3fad365a747283a00a1d1ad5e8d6675b7 (git)
Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < abb02e05cb1c0a30dd873a29f33bc092067dc35d (git)
Affected: 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd , < 58e2071742e38f29f051b709a5cca014ba51166f (git)

Linux

Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

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-8Q2M-46MC-PJW4

CVE-2021-47223 (GCVE-0-2021-47223)

Tags

Sightings

Nomenclature