Vulnerability-Lookup

FKIE_CVE-2025-39848

Vulnerability from fkie_nvd - Published: 2025-09-19 16:15 - Updated: 2026-01-20 15:19

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("net: introduce per netns packet chains"). skb->dev becomes NULL and we crash in __netif_receive_skb_core(). Before above commit, different kind of bugs or corruptions could happen without a major crash. But the root cause is that ax25_kiss_rcv() can queue/mangle input skb without checking if this skb is shared or not. Many thanks to Bernard Pidoux for his help, diagnosis and tests. We had a similar issue years ago fixed with commit 7aaed57c5c28 ("phonet: properly unshare skbs in phonet_rcv()").

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory, Mailing List
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory, Mailing List

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
debian	debian_linux	11.0

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: properly unshare skbs in ax25_kiss_rcv()\n\nBernard Pidoux reported a regression apparently caused by commit\nc353e8983e0d (\"net: introduce per netns packet chains\").\n\nskb-\u003edev becomes NULL and we crash in __netif_receive_skb_core().\n\nBefore above commit, different kind of bugs or corruptions could happen\nwithout a major crash.\n\nBut the root cause is that ax25_kiss_rcv() can queue/mangle input skb\nwithout checking if this skb is shared or not.\n\nMany thanks to Bernard Pidoux for his help, diagnosis and tests.\n\nWe had a similar issue years ago fixed with commit 7aaed57c5c28\n(\"phonet: properly unshare skbs in phonet_rcv()\")."
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          "confidentialityImpact": "NONE",
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CVE-2025-39848 (GCVE-0-2025-39848)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2025-11-03 17:44

Title

ax25: properly unshare skbs in ax25_kiss_rcv()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/42b46684e2c78ee05…
	https://git.kernel.org/stable/c/5b079be1b9da49ad8…
	https://git.kernel.org/stable/c/2bd0f67212908243c…
	https://git.kernel.org/stable/c/01a2984cb803f2d48…
	https://git.kernel.org/stable/c/7d449b7a6c8ee434d…
	https://git.kernel.org/stable/c/89064cf534bea4bb2…
	https://git.kernel.org/stable/c/b1c71d674a308d2fb…
	https://git.kernel.org/stable/c/8156210d36a43e763…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 42b46684e2c78ee052d8c2ee8d9c2089233c9094 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5b079be1b9da49ad88fc304c874d4be7085f7883 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2bd0f67212908243ce88e35bf69fa77155b47b14 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 01a2984cb803f2d487b7074f9718db2bf3531f69 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7d449b7a6c8ee434d10a483feed7c5c50108cf56 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89064cf534bea4bb28c83fe6bbb26657b19dd5fe (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b1c71d674a308d2fbc83efcf88bfc4217a86aa17 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8156210d36a43e76372312c87eb5ea3dbb405a85 (git)

Linux

Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.299 , ≤ 5.4.* (semver)
Unaffected: 5.10.243 , ≤ 5.10.* (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.151 , ≤ 6.1.* (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: properly unshare skbs in ax25_kiss_rcv()\n\nBernard Pidoux reported a regression apparently caused by commit\nc353e8983e0d (\"net: introduce per netns packet chains\").\n\nskb-\u003edev becomes NULL and we crash in __netif_receive_skb_core().\n\nBefore above commit, different kind of bugs or corruptions could happen\nwithout a major crash.\n\nBut the root cause is that ax25_kiss_rcv() can queue/mangle input skb\nwithout checking if this skb is shared or not.\n\nMany thanks to Bernard Pidoux for his help, diagnosis and tests.\n\nWe had a similar issue years ago fixed with commit 7aaed57c5c28\n(\"phonet: properly unshare skbs in phonet_rcv()\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:00:58.643Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883"
        },
        {
          "url": "https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14"
        },
        {
          "url": "https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56"
        },
        {
          "url": "https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17"
        },
        {
          "url": "https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85"
        }
      ],
      "title": "ax25: properly unshare skbs in ax25_kiss_rcv()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39848",
    "datePublished": "2025-09-19T15:26:21.403Z",
    "dateReserved": "2025-04-16T07:20:57.142Z",
    "dateUpdated": "2025-11-03T17:44:06.959Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2025-39848

CVE-2025-39848 (GCVE-0-2025-39848)

Tags

Sightings

Nomenclature