CVE-2025-38732

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Source
https://cve.org/CVERecord?id=CVE-2025-38732
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38732.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-38732
Downstream
Related
Published
2025-09-05T17:20:31.934Z
Modified
2026-05-07T04:16:58.736118Z
Summary
netfilter: nf_reject: don't leak dst refcount for loopback packets
Details

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 skbdstcheckunset include/linux/skbuff.h:1164 [inline] WARNING: include/linux/skbuff.h:1165 skbdstset include/linux/skbuff.h:1210 [inline] WARNING: include/linux/skbuff.h:1165 nfrejectfillskbdst+0x2a4/0x330 net/ipv4/netfilter/nfrejectipv4.c:234 [..] Call Trace: nfsendunreach+0x17b/0x6e0 net/ipv4/netfilter/nfrejectipv4.c:325 nftrejectineteval+0x4bc/0x690 net/netfilter/nftrejectinet.c:27 exprcallopseval net/netfilter/nftables_core.c:237 [inline] ..

This is because blamed commit forgot about loopback packets. Such packets already have a dstentry attached, even at PREROUTING stage.

Instead of checking hook just check if the skb already has a route attached to it.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38732.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f53b9b0bdc59c0823679f2e3214e0d538f5951b9
Fixed
7b8b503c06274ef3c6c1a107743f1ec0d0a53ef8
Fixed
82ef97abf22790182f7d433c74960dfd61b99c33
Fixed
b7a885ba25960c91db237c3f83b4285156789bce
Fixed
a0a3ace2a57887dac1e7c9a724846040c3e31868
Fixed
51e8531371f90bee742c63775c9a568e5d6bf3c5
Fixed
b32e1590a8d22cf7d7f965e46d5576051acf8e42
Fixed
91a79b792204313153e1bdbbe5acbfc28903b3a5

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38732.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
5.9.0
Fixed
5.10.241
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.190
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.149
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.103
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.44
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.16.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-38732.json"