CVE-2025-38124

MEDIUM EPSS 4.4%
Published Jul 3, 202512mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Jul 3, 2025 12mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix udp gso skb_segment after pull from frag_list Commit a1e40ac5b5e9 ("net: gso: fix udp gso fraglist segmentation after pull from frag_list") detected invalid geometry in frag_list skbs and redirects them from skb_segment_list to more robust skb_segment. But some packets with modified geometry can also hit bugs in that code. We don't know how many such cases exist. Addressing each one by one also requires touching the complex skb_segment code, which risks introducing bugs for other types of skbs. Instead, linearize all these packets that fail the basic invariants on gso fraglist skbs. That is more robust. If only part of the fraglist payload is pulled into head_skb, it will always cause exception when splitting skbs by skb_segment. For detailed call stack information, see below. Valid SKB_GSO_FRAGLIST skbs - consist of two or more segments - the head_skb holds the protocol headers plus first gso_size - one or more frag_list skbs hold exactly one segment - all but the last must be gso_size Optional datapath hooks such as NAT and BPF (bpf_skb_pull_data) can modify fraglist skbs, breaking these invariants. In extreme cases they pull one part of data into skb linear. For UDP, this causes three payloads with lengths of (11,11,10) bytes were pulled tail to become (12,10,10) bytes. The skbs no longer meets the above SKB_GSO_FRAGLIST conditions because payload was pulled into head_skb, it needs to be linearized before pass to regular skb_segment. skb_segment+0xcd0/0xd14 __udp_gso_segment+0x334/0x5f4 udp4_ufo_fragment+0x118/0x15c inet_gso_segment+0x164/0x338 skb_mac_gso_segment+0xc4/0x13c __skb_gso_segment+0xc4/0x124 validate_xmit_skb+0x9c/0x2c0 validate_xmit_skb_list+0x4c/0x80 sch_direct_xmit+0x70/0x404 __dev_queue_xmit+0x64c/0xe5c neigh_resolve_output+0x178/0x1c4 ip_finish_output2+0x37c/0x47c __ip_finish_output+0x194/0x240 ip_finish_output+0x20/0xf4 ip_output+0x100/0x1a0 NF_HOOK+0xc4/0x16c ip_forward+0x314/0x32c ip_rcv+0x90/0x118 __netif_receive_skb+0x74/0x124 process_backlog+0xe8/0x1a4 __napi_poll+0x5c/0x1f8 net_rx_action+0x154/0x314 handle_softirqs+0x154/0x4b8 [118.376811] [C201134] rxq0_pus: [name:bug&]kernel BUG at net/core/skbuff.c:4278! [118.376829] [C201134] rxq0_pus: [name:traps&]Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP [118.470774] [C201134] rxq0_pus: [name:mrdump&]Kernel Offset: 0x178cc00000 from 0xffffffc008000000 [118.470810] [C201134] rxq0_pus: [name:mrdump&]PHYS_OFFSET: 0x40000000 [118.470827] [C201134] rxq0_pus: [name:mrdump&]pstate: 60400005 (nZCv daif +PAN -UAO) [118.470848] [C201134] rxq0_pus: [name:mrdump&]pc : [0xffffffd79598aefc] skb_segment+0xcd0/0xd14 [118.470900] [C201134] rxq0_pus: [name:mrdump&]lr : [0xffffffd79598a5e8] skb_segment+0x3bc/0xd14 [118.470928] [C201134] rxq0_pus: [name:mrdump&]sp : ffffffc008013770

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥6.1.113  –  <6.1.142
linuxlinux_kernel*≥6.6.55  –  <6.6.94
linuxlinux_kernel*≥6.10.14  –  <6.11
linuxlinux_kernel*≥6.11.3  –  <6.12
linuxlinux_kernel*≥6.12.1  –  <6.12.34
linuxlinux_kernel*≥6.13  –  <6.15.3
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
debiandebian_linux11.0any

References 7

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
  • git.kernel.org https://git.kernel.org/stable/c/0e65f38bd1aa14ea86e221b7bb814d38278d86c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3382a1ed7f778db841063f5d7e317ac55f9e7f72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4399f59a9467a324ed46657555f0e1f209a14acb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85eef1748c024da1a191aed56b30a3a65958c50c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04302867094bdc6efac1b598370fc47cf3f2388
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0e65f38bd1aa14ea86e221b7bb814d38278d86c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3382a1ed7f778db841063f5d7e317ac55f9e7f72
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4399f59a9467a324ed46657555f0e1f209a14acb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85eef1748c024da1a191aed56b30a3a65958c50c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04302867094bdc6efac1b598370fc47cf3f2388
    Patch