bpf: Explicitly check accesses to bpf_sock_addr
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.
CVE-2025-40078
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-40078
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "de44cdc50d2dce8718cb57deddf9cf1be9a7759f",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "76e04bbb4296fb6eac084dbfc27e02ccc744db3e",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "4f00858cd9bbbdf67159e28b85a8ca9e77c83622",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "cdeafacb4f9ff261a96baef519e29480fd7b1019",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "fe9d33f0470350558cb08cecb54cf2267b3a45d2",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69",
"versionType": "git"
},
{
"status": "affected",
"version": "1cedee13d25ab118d325f95588c1a084e9317229",
"lessThan": "6fabca2fc94d33cdf7ec102058983b086293395f",
"versionType": "git"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.301",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.156",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.112",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.53",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.3",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-40078
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27082 · Revision 1
- Added to Heist Feed
- Publisher date