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

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-08-05 12:05
VLAI
Title
ax25: properly unshare skbs in ax25_kiss_rcv()
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()").
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux 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)
Create a notification for this product.
Linux 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)
Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:26:59+00:00",
      "cve": "CVE-2025-39848",
      "id": "CVE-2025-39848",
      "initial_release_date": "2025-09-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ax25: properly unshare skbs in ax25_kiss_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39848.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-17T13:08:05Z",
      "cve": "CVE-2025-39848",
      "id": "CVE-2025-39848",
      "initial_release_date": "2025-09-19T23:23:56Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "263",
      "product_status:recommended": "500",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39848",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39848.json",
      "version": "49"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.