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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-64548

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64548

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "a12b1575f9feabd91695a9e9d004862f7195fa25",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "888706a76286c547bd035432602571e8024b5305",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "db77b6bb6e6edb79b10b4efcce346eec5582d588",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "4e40056bb5c829f0423f0a6694a0477726d2147e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "bd004716ba75fed6d185795c85cdc92540ebeaab",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
        "lessThan": "0c0a8ed85349dae298712d79cb276acfeb794d82",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.20"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.20",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64548

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41079 · Revision 1
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Publisher date
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