CVE-2025-39848
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ax25: properly unshare skbs in ax25_kiss_rcv()
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()").
Detalles técnicos trazas, registros y código del informe original
Bernard Pidoux reported a regression apparently caused by commit
c353e8983e0d ("net: introduce per netns packet chains").CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.24%
- Percentil entre todas las CVEs puntuadas: 13
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-401
Referencias
- https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
- https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
- https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
- https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
- https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
- https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
- https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
- https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
JSON original (NVD)
Mostrar
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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->dev 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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