CVE-2025-40078None▾ SunlitIn 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:…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < de44cdc50d2dce8718cb57deddf9cf1be9a7759fLinux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 76e04bbb4296fb6eac084dbfc27e02ccc744db3eLinux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ecLinux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 4f00858cd9bbbdf67159e28b85a8ca9e77c83622Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < cdeafacb4f9ff261a96baef519e29480fd7b1019Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < fe9d33f0470350558cb08cecb54cf2267b3a45d2Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69Linux >= 1cedee13d25ab118d325f95588c1a084e9317229 < 6fabca2fc94d33cdf7ec102058983b086293395fLinux 4.18Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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