CVE-2025-38732
published 2025-09-05CVE-2025-38732: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_reject: don't leak dst refcount for loopback packets recent patches to add a…
medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_reject: don't leak dst refcount for loopback packets
recent patches to add a WARN() when replacing skb dst entry found an
old bug:
WARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline]
WARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline]
WARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234
[..]
Call Trace:
nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325
nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
..
This is because blamed commit forgot about loopback packets.
Such packets already have a dst_entry attached, even at PRE_ROUTING stage.
Instead of checking hook just check if the skb already has a route
attached to it.
Affected
36 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < 7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8 | 7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8 |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < 82ef97abf22790182f7d433c74960dfd61b99c33 | 82ef97abf22790182f7d433c74960dfd61b99c33 |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < b7a885ba25960c91db237c3f83b4285156789bce | b7a885ba25960c91db237c3f83b4285156789bce |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < a0a3ace2a57887dac1e7c9a724846040c3e31868 | a0a3ace2a57887dac1e7c9a724846040c3e31868 |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < 51e8531371f90bee742c63775c9a568e5d6bf3c5 | 51e8531371f90bee742c63775c9a568e5d6bf3c5 |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < b32e1590a8d22cf7d7f965e46d5576051acf8e42 | b32e1590a8d22cf7d7f965e46d5576051acf8e42 |
| linux | linux | >= f53b9b0bdc59c0823679f2e3214e0d538f5951b9 < 91a79b792204313153e1bdbbe5acbfc28903b3a5 | 91a79b792204313153e1bdbbe5acbfc28903b3a5 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.244-1 | 5.10.244-1 |
| linux | linux_kernel | >= 0 < 6.1.153-1 | 6.1.153-1 |
| linux | linux_kernel | >= 0 < 6.12.48-1 | 6.12.48-1 |
| linux | linux_kernel | >= 0 < 6.16.5-1 | 6.16.5-1 |
| linux | linux_kernel | >= 0 < 5.15.0-163.173 | 5.15.0-163.173 |
| linux | linux_kernel | >= 0 < 6.8.0-100.100 | 6.8.0-100.100 |
| linux | linux_kernel | >= 5.11 < 5.15.190 | 5.15.190 |
| linux | linux_kernel | >= 5.16 < 6.1.149 | 6.1.149 |
| linux | linux_kernel | >= 5.9 < 5.10.241 | 5.10.241 |
| linux | linux_kernel | >= 6.13 < 6.16.4 | 6.16.4 |
| linux | linux_kernel | >= 6.2 < 6.6.103 | 6.6.103 |
| linux | linux_kernel | >= 6.7 < 6.12.44 | 6.12.44 |
| msrc | azl3_kernel_6.6.96.2-1_on_azure_linux_3.0 | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM