bpf: Explicitly check accesses to bpf_sock_addr
Summary
| CVE | CVE-2025-40078 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-10-28 12:15:42 UTC |
| Updated | 2026-07-14 13:17:52 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: bpf: Explicitly check accesses to bpf_sock_addr 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 bpf_sock_addr corresponds to an implicit padding of 4 bytes, right after msg_src_ip4. Access to this padding isn't rejected in sock_addr_is_valid_access and it thus later fails to convert the access. This patch fixes it by explicitly checking the various fields of bpf_sock_addr in sock_addr_is_valid_access. I checked the other ctx structures and is_valid_access functions and didn't find any other similar cases. Other cases of (properly handled) padding are covered in new tests in a subsequent patch. |
Risk And Classification
EPSS: 0.001970000 probability, percentile 0.095870000 (date 2026-07-14)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 de44cdc50d2dce8718cb57deddf9cf1be9a7759f git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 76e04bbb4296fb6eac084dbfc27e02ccc744db3e git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 4f00858cd9bbbdf67159e28b85a8ca9e77c83622 git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 cdeafacb4f9ff261a96baef519e29480fd7b1019 git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 fe9d33f0470350558cb08cecb54cf2267b3a45d2 git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69 git | Not specified |
| CNA | Linux | Linux | affected 1cedee13d25ab118d325f95588c1a084e9317229 6fabca2fc94d33cdf7ec102058983b086293395f git | Not specified |
| CNA | Linux | Linux | affected 4.18 | Not specified |
| CNA | Linux | Linux | unaffected 4.18 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.4.301 5.4.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.246 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.195 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.156 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.112 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.53 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.17.3 6.17.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18 * original_commit_for_fix | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
| ADP | Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | affected V3.1.6 * custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4f00858cd9bbbdf67159e28b85a8ca9e77c83622 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| cert-portal.siemens.com/productcert/html/ssa-019113.html | 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e | cert-portal.siemens.com | |
| git.kernel.org/stable/c/cdeafacb4f9ff261a96baef519e29480fd7b1019 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6fabca2fc94d33cdf7ec102058983b086293395f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/76e04bbb4296fb6eac084dbfc27e02ccc744db3e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fe9d33f0470350558cb08cecb54cf2267b3a45d2 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.