cbcvebase.
CVE-2025-38192
published 2025-07-04

CVE-2025-38192: In the Linux kernel, the following vulnerability has been resolved: net: clear the dst when changing skb protocol A not-so-careful NAT46 BPF program can crash…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.16%
5.6th percentile
In the Linux kernel, the following vulnerability has been resolved: net: clear the dst when changing skb protocol A not-so-careful NAT46 BPF program can crash the kernel if it indiscriminately flips ingress packets from v4 to v6: BUG: kernel NULL pointer dereference, address: 0000000000000000 ip6_rcv_core (net/ipv6/ip6_input.c:190:20) ipv6_rcv (net/ipv6/ip6_input.c:306:8) process_backlog (net/core/dev.c:6186:4) napi_poll (net/core/dev.c:6906:9) net_rx_action (net/core/dev.c:7028:13) do_softirq (kernel/softirq.c:462:3) netif_rx (net/core/dev.c:5326:3) dev_loopback_xmit (net/core/dev.c:4015:2) ip_mc_finish_output (net/ipv4/ip_output.c:363:8) NF_HOOK (./include/linux/netfilter.h:314:9) ip_mc_output (net/ipv4/ip_output.c:400:5) dst_output (./include/net/dst.h:459:9) ip_local_out (net/ipv4/ip_output.c:130:9) ip_send_skb (net/ipv4/ip_output.c:1496:8) udp_send_skb (net/ipv4/udp.c:1040:8) udp_sendmsg (net/ipv4/udp.c:1328:10) The output interface has a 4->6 program attached at ingress. We try to loop the multicast skb back to the sending socket. Ingress BPF runs as part of netif_rx(), pushes a valid v6 hdr and changes skb->protocol to v6. We enter ip6_rcv_core which tries to use skb_dst(). But the dst is still an IPv4 one left after IPv4 mcast output. Clear the dst in all BPF helpers which change the protocol. Try to preserve metadata dsts, those may carry non-routing metadata.

Affected

50 ranges· showing 25
VendorProductVersion rangeFixed in
debianlinux< linux 6.12.35-1 (forky)linux 6.12.35-1 (forky)
linuxlinux
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < a046f183d21ab5ace5a96ece4cf9873a42f003a7a046f183d21ab5ace5a96ece4cf9873a42f003a7
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < 98b1d8dc9a3170b2614f1e8c93854e75cdd8398098b1d8dc9a3170b2614f1e8c93854e75cdd83980
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < bfa4d86e130a09f67607482e988313430e38f6c4bfa4d86e130a09f67607482e988313430e38f6c4
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < 2a3ad42a57b43145839f2f233fb562247658a6d92a3ad42a57b43145839f2f233fb562247658a6d9
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < e9994e7b9f7bbb882d13c8191731649249150d21e9994e7b9f7bbb882d13c8191731649249150d21
linuxlinux>= 6578171a7ff0c31dc73258f93da7407510abf085 < ba9db6f907ac02215e30128770f85fbd7db2fcf9ba9db6f907ac02215e30128770f85fbd7db2fcf9
linuxlinux_kernel
linuxlinux_kernel>= 0 < 6.12.35-16.12.35-1
linuxlinux_kernel>= 0 < 6.12.35-16.12.35-1
linuxlinux_kernel>= 0 < 6.8.0-100.1006.8.0-100.100
linuxlinux_kernel>= 4.8 < 6.6.956.6.95
linuxlinux_kernel>= 6.13 < 6.15.46.15.4
linuxlinux_kernel>= 6.7 < 6.12.356.12.35
msrcazl3_kernel_6.6.92.2-2_on_azure_linux_3.0
msrcazl3_kernel_6.6.96.1-1_on_azure_linux_3.0
msrccbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0
msrccbl2_kernel_5.15.200.1-1_on_cbl_mariner_2.0
msrccbl2_kernel_5.15.202.1-1_on_cbl_mariner_2.0
ubuntulinux
ubuntulinux-aws
ubuntulinux-aws-5.15
ubuntulinux-aws-6.8
ubuntulinux-aws-fips

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.6MEDIUM
vendor_ubuntu7.1HIGH
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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