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CVE-2025-40078— bpf: Explicitly check accesses to bpf_sock_addr

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确验证bpf_sock_addr结构体访问，可能导致越界访问。

AI Predicted 7.8 Difficulty: Hard EPSS 0.24% · P15

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1cedee13d25ab118d325f95588c1a084e9317229< de44cdc50d2dce8718cb57deddf9cf1be9a7759f affected
1cedee13d25ab118d325f95588c1a084e9317229< 76e04bbb4296fb6eac084dbfc27e02ccc744db3e affected
1cedee13d25ab118d325f95588c1a084e9317229< 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec affected
1cedee13d25ab118d325f95588c1a084e9317229< 4f00858cd9bbbdf67159e28b85a8ca9e77c83622 affected
1cedee13d25ab118d325f95588c1a084e9317229< cdeafacb4f9ff261a96baef519e29480fd7b1019 affected
1cedee13d25ab118d325f95588c1a084e9317229< fe9d33f0470350558cb08cecb54cf2267b3a45d2 affected
1cedee13d25ab118d325f95588c1a084e9317229< ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69 affected
1cedee13d25ab118d325f95588c1a084e9317229< 6fabca2fc94d33cdf7ec102058983b086293395f affected
… +10 more rows
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I. Basic Information for CVE-2025-40078

Vulnerability Information
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Vulnerability Title
bpf: Explicitly check accesses to bpf_sock_addr
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确验证bpf_sock_addr结构体访问，可能导致越界访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1cedee13d25ab118d325f95588c1a084e9317229 ~ de44cdc50d2dce8718cb57deddf9cf1be9a7759f -
Linux Linux 4.18 -

II. Public POCs for CVE-2025-40078

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III. Intelligence Information for CVE-2025-40078

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Patches & Fixes for CVE-2025-40078 (2)

Same Patch Batch · Linux · 2025-10-28 · 58 CVEs total

CVE-2025-40074 9.8 CRITICAL ipv4: start using dst_dev_rcu()
CVE-2025-40043 8.8 HIGH net: nfc: nci: Add parameter validation for packet data
CVE-2025-40039 8.8 HIGH ksmbd: Fix race condition in RPC handle list access
CVE-2025-40058 8.8 HIGH iommu/vt-d: Disallow dirty tracking if incoherent page walk
CVE-2025-40046 8.6 HIGH io_uring/zcrx: fix overshooting recv limit
CVE-2025-40068 8.4 HIGH fs: ntfs3: Fix integer overflow in run_unpack()
CVE-2025-40075 8.1 HIGH tcp_metrics: use dst_dev_net_rcu()
CVE-2025-40026 7.9 HIGH KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O
CVE-2025-40027 7.8 HIGH net/9p: fix double req put in p9_fd_cancelled
CVE-2025-40051 7.8 HIGH vhost: vringh: Modify the return value check
CVE-2025-40061 7.8 HIGH RDMA/rxe: Fix race in do_task() when draining
CVE-2025-40081 7.8 HIGH perf: arm_spe: Prevent overflow in PERF_IDX2OFF()
CVE-2025-40079 7.8 HIGH riscv, bpf: Sign extend struct ops return values properly
CVE-2025-40028 7.8 HIGH binder: fix double-free in dbitmap
CVE-2025-40041 7.8 HIGH LoongArch: BPF: Sign-extend struct ops return values properly
CVE-2025-40054 7.8 HIGH f2fs: fix UAF issue in f2fs_merge_page_bio()
CVE-2025-40044 7.8 HIGH fs: udf: fix OOB read in lengthAllocDescs handling
CVE-2025-40045 7.8 HIGH ASoC: codecs: wcd937x: set the comp soundwire port correctly
CVE-2025-40025 7.8 HIGH f2fs: fix to do sanity check on node footer for non inode dnode
CVE-2025-40047 7.8 HIGH io_uring/waitid: always prune wait queue entry in io_waitid_wait()

Showing top 20 of 58 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40078

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