CVEvulnerability

CVE-2025-39848

5.5 MEDIUM Published 2025-09-19 Modified 2026-10-19 Official page ↗
Status
Modified
Published
2025-09-19
Last modified
2026-10-19
Assigner
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
8.8 HIGH — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-401

Description

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()").

Affected configurations

• linux linux kernel (>= 2.6.12.1 < 5.4.299) • linux linux kernel (>= 5.5 < 5.10.243) • linux linux kernel (>= 5.11 < 5.15.192) • linux linux kernel (>= 5.16 < 6.1.151) • linux linux kernel (>= 6.2 < 6.6.105) • linux linux kernel (>= 6.7 < 6.12.46) • linux linux kernel (>= 6.13 < 6.16.6) • linux linux kernel 2.6.12 • linux linux kernel 6.17 • debian debian linux 11.0

Related

Weakness · CWE (1)

  • CWE-401 Missing Release of Memory after Effective Lifetime weakness

References