CVE-2025-40078

bpf: Explicitly check accesses to bpf_sock_addr

Not available

At a glance

Source
NVD
EPSS
EPSS 0.24 % · percentile 16 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Deferred

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.

References

European references

CERT-FR advisories

Affected products

ProductVersions
Linux · Linuxaffected 1cedee13d25ab118d325f95588c1a084e9317229 < de44cdc50d2dce8718cb57deddf9cf1be9a7759f ; affected 1cedee13d25ab118d325f95588c1a084e9317229 < 76e04bbb4296fb6eac084dbfc27e02ccc744db3e ; affected 1cedee13d25ab118d325f95588c1a084e9317229 < 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec ; affected 1cedee13d25ab118d325f95588c1a084e9317229 < 4f00858cd9bbbdf67159e28b85a8ca9e77c83622 ; affected 1cedee13d25ab118d325f95588c1a084e9317229 < cdeafacb4f9ff261a96baef519e29480fd7b1019 ; affected 1cedee13d25ab118d325f95588c1a084e9317229 < fe9d33f0470350558cb08cecb54cf2267b3a45d2
Linux · Linuxaffected 4.18 ; unaffected 0 < 4.18 ; unaffected 5.4.301 ≤ 5.4.* ; unaffected 5.10.246 ≤ 5.10.* ; unaffected 5.15.195 ≤ 5.15.* ; unaffected 6.1.156 ≤ 6.1.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD