{"id":"CVE-2026-64548","title":"bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()","summary":"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 an…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < a12b1575f9feabd91695a9e9d004862f7195fa25","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 888706a76286c547bd035432602571e8024b5305","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < db77b6bb6e6edb79b10b4efcce346eec5582d588","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 4e40056bb5c829f0423f0a6694a0477726d2147e","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < bd004716ba75fed6d185795c85cdc92540ebeaab","Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 0c0a8ed85349dae298712d79cb276acfeb794d82","Linux 4.20"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:42:23.113167Z"},"published":"2026-07-27","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:51.859Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64548","references":[{"url":"https://git.kernel.org/stable/c/f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5"},{"url":"https://git.kernel.org/stable/c/a12b1575f9feabd91695a9e9d004862f7195fa25"},{"url":"https://git.kernel.org/stable/c/ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d"},{"url":"https://git.kernel.org/stable/c/888706a76286c547bd035432602571e8024b5305"},{"url":"https://git.kernel.org/stable/c/db77b6bb6e6edb79b10b4efcce346eec5582d588"},{"url":"https://git.kernel.org/stable/c/4e40056bb5c829f0423f0a6694a0477726d2147e"},{"url":"https://git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab"},{"url":"https://git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82"}],"tags":["cve.org"],"epss":0.00142,"epssPercentile":0.03112,"ingestedAt":"2026-10-16T17:24:46.832Z","slug":"CVE-2026-64548","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < a12b1575f9feabd91695a9e9d004862f7195fa25`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 888706a76286c547bd035432602571e8024b5305`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < db77b6bb6e6edb79b10b4efcce346eec5582d588`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 4e40056bb5c829f0423f0a6694a0477726d2147e`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < bd004716ba75fed6d185795c85cdc92540ebeaab`\n- `Linux >= 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 < 0c0a8ed85349dae298712d79cb276acfeb794d82`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}