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CVE-2025-40078

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.
Daten sind bereitgestellt durch das CVE Programm von Authorized Data Publishers (ADP) (Unstrukturiert)
HerstellerSiemens
≫
Produkt SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Default Statusunknown
Version V3.1.6
Version < *
Status affected
HerstellerSiemens
≫
Produkt SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Default Statusunknown
Version V3.1.6
Version < *
Status affected
HerstellerSiemens
≫
Produkt SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Default Statusunknown
Version V3.1.6
Version < *
Status affected
HerstellerSiemens
≫
Produkt SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Default Statusunknown
Version V3.1.6
Version < *
Status affected
HerstellerSiemens
≫
Produkt SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Default Statusunknown
Version V3.1.6
Version < *
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
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EPSS FIRST.org 0.22% 0.129
CVSS Metriken
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Es wurden noch keine Informationen zu CWE veröffentlicht.
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://git.kernel.org/stable/c/76e04bbb4296fb6eac084dbfc27e02ccc744db3e
https://git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f
https://cert-portal.siemens.com/productcert/html/ssa-019113.html