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CVE-2026-64548

bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In 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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in a12b1575f9feabd91695a9e9d004862f7195fa25; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 888706a76286c547bd035432602571e8024b5305; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in db77b6bb6e6edb79b10b4efcce346eec5582d588; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 4e40056bb5c829f0423f0a6694a0477726d2147e; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in bd004716ba75fed6d185795c85cdc92540ebeaab; From 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 · fixed in 0c0a8ed85349dae298712d79cb276acfeb794d82

  • Linux Linux

    4.20

  • KernelLinux

    From 4.20.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org