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
2026-03-20T12:43:00.208573Z
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 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38732.json"
}
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"