CVE-2025-40078bpf: Explicitly check accesses to bpf_sock_addr
Updated under an hour ago ()
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It affects Linux and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1cedee13d25ab118d325f95588c1a084e9317229 before de44cdc50d2dce8718cb57deddf9cf1be9a7759f; from 1cedee13d25ab118d325f95588c1a084e9317229 before 76e04bbb4296fb6eac084dbfc27e02ccc744db3e; from 1cedee13d25ab118d325f95588c1a084e9317229 before 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec; from 1cedee13d25ab118d325f95588c1a084e9317229 before 4f00858cd9bbbdf67159e28b85a8ca9e77c83622; from 1cedee13d25ab118d325f95588c1a084e9317229 before cdeafacb4f9ff261a96baef519e29480fd7b1019; from 1cedee13d25ab118d325f95588c1a084e9317229 before fe9d33f0470350558cb08cecb54cf2267b3a45d2; from 1cedee13d25ab118d325f95588c1a084e9317229 before ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69; from 1cedee13d25ab118d325f95588c1a084e9317229 before 6fabca2fc94d33cdf7ec102058983b086293395f | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
References
- https://git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f
- https://git.kernel.org/stable/c/76e04bbb4296fb6eac084dbfc27e02ccc744db3e
- https://git.kernel.org/stable/c/6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec
- https://git.kernel.org/stable/c/4f00858cd9bbbdf67159e28b85a8ca9e77c83622
- https://git.kernel.org/stable/c/cdeafacb4f9ff261a96baef519e29480fd7b1019
- https://git.kernel.org/stable/c/fe9d33f0470350558cb08cecb54cf2267b3a45d2
- https://git.kernel.org/stable/c/ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69
- https://git.kernel.org/stable/c/6fabca2fc94d33cdf7ec102058983b086293395f
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.