CVE-2025-40078

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Source
https://cve.org/CVERecord?id=CVE-2025-40078
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40078.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-40078
Downstream
Related
Published
2025-10-28T11:48:43.548Z
Modified
2026-03-20T12:43:10.326259Z
Summary
bpf: Explicitly check accesses to bpf_sock_addr
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Explicitly check accesses to bpfsockaddr

Syzkaller found a kernel warning on the following sock_addr program:

0: r0 = 0
1: r2 = *(u32 *)(r1 +60)
2: exit

which triggers:

verifier bug: error during ctx access conversion (0)

This is happening because offset 60 in bpfsockaddr corresponds to an implicit padding of 4 bytes, right after msgsrcip4. Access to this padding isn't rejected in sockaddrisvalidaccess and it thus later fails to convert the access.

This patch fixes it by explicitly checking the various fields of bpfsockaddr in sockaddrisvalidaccess.

I checked the other ctx structures and isvalidaccess functions and didn't find any other similar cases. Other cases of (properly handled) padding are covered in new tests in a subsequent patch.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40078.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
1cedee13d25ab118d325f95588c1a084e9317229
Fixed
de44cdc50d2dce8718cb57deddf9cf1be9a7759f
Fixed
76e04bbb4296fb6eac084dbfc27e02ccc744db3e
Fixed
6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec
Fixed
4f00858cd9bbbdf67159e28b85a8ca9e77c83622
Fixed
cdeafacb4f9ff261a96baef519e29480fd7b1019
Fixed
fe9d33f0470350558cb08cecb54cf2267b3a45d2
Fixed
ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69
Fixed
6fabca2fc94d33cdf7ec102058983b086293395f

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40078.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.18.0
Fixed
5.4.301
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.10.246
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.195
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.156
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.112
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.53
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.17.3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-40078.json"