GHSA-V3W7-WGCW-WJF2
Vulnerability from github – Published: 2026-07-27 21:31 – Updated: 2026-07-30 06:32In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()
When the scatterlist ring is full or nearly full, bpf_msg_push_data() enters a copy fallback path and computes copy + len for the page allocation size. Since len comes from BPF with arg3_type = ARG_ANYTHING and both are u32, a crafted len can wrap the sum to a small value, causing an undersized allocation followed by an out-of-bounds memcpy.
BUG: unable to handle page fault for address: ffffed104089a402 Oops: Oops: 0000 [#1] SMP KASAN NOPTI Call Trace: __asan_memcpy (mm/kasan/shadow.c:105) bpf_msg_push_data (net/core/filter.c:2852 net/core/filter.c:2788) bpf_prog_9ed8b5711920a7d7+0x2e/0x36 sk_psock_msg_verdict (net/core/skmsg.c:934) tcp_bpf_sendmsg (net/ipv4/tcp_bpf.c:421 net/ipv4/tcp_bpf.c:584) __sys_sendto (net/socket.c:2206) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
Add an overflow check before the allocation.
{
"affected": [],
"aliases": [
"CVE-2026-64548"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-27T21:17:07Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()\n\nWhen the scatterlist ring is full or nearly full, bpf_msg_push_data()\nenters a copy fallback path and computes copy + len for the page\nallocation size. Since len comes from BPF with arg3_type = ARG_ANYTHING\nand both are u32, a crafted len can wrap the sum to a small value,\ncausing an undersized allocation followed by an out-of-bounds memcpy.\n\n BUG: unable to handle page fault for address: ffffed104089a402\n Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n Call Trace:\n __asan_memcpy (mm/kasan/shadow.c:105)\n bpf_msg_push_data (net/core/filter.c:2852 net/core/filter.c:2788)\n bpf_prog_9ed8b5711920a7d7+0x2e/0x36\n sk_psock_msg_verdict (net/core/skmsg.c:934)\n tcp_bpf_sendmsg (net/ipv4/tcp_bpf.c:421 net/ipv4/tcp_bpf.c:584)\n __sys_sendto (net/socket.c:2206)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd an overflow check before the allocation.",
"id": "GHSA-v3w7-wgcw-wjf2",
"modified": "2026-07-30T06:32:34Z",
"published": "2026-07-27T21:31:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64548"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4e40056bb5c829f0423f0a6694a0477726d2147e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/888706a76286c547bd035432602571e8024b5305"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a12b1575f9feabd91695a9e9d004862f7195fa25"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db77b6bb6e6edb79b10b4efcce346eec5582d588"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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