5.5

CVE-2025-39848

ax25: properly unshare skbs in ax25_kiss_rcv()

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()").
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.12.1 < 5.4.299
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.243
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.192
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.151
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.105
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.46
Linux ≫ Linux Kernel Version >= 6.13 < 6.16.6
Linux ≫ Linux Kernel Version2.6.12 Update-
Linux ≫ Linux Kernel Version2.6.12 Updaterc2
Linux ≫ Linux Kernel Version2.6.12 Updaterc3
Linux ≫ Linux Kernel Version2.6.12 Updaterc4
Linux ≫ Linux Kernel Version2.6.12 Updaterc5
Linux ≫ Linux Kernel Version6.17 Updaterc1
Linux ≫ Linux Kernel Version6.17 Updaterc2
Linux ≫ Linux Kernel Version6.17 Updaterc3
Linux ≫ Linux Kernel Version6.17 Updaterc4
Debian ≫ Debian Linux Version11.0
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.045
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-401 Missing Release of Memory after Effective Lifetime

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
Patch
https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
Patch
https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
Patch
https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
Patch
https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
Patch
https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
Patch
https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
Patch
https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
Mailing List
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory
Mailing List
https://cert-portal.siemens.com/productcert/html/ssa-032379.html