Vulnerability-Lookup

GHSA-V3W7-WGCW-WJF2

Vulnerability from github – Published: 2026-07-27 21:31 – Updated: 2026-07-27 21:31

Details

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.

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{
  "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": null
  },
  "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": "2026-07-27T21:31:26Z",
  "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": []
}

CVE-2026-64548 (GCVE-0-2026-64548)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-07-27 20:10

Title

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

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.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/f1644c9508d24f50d…
https://git.kernel.org/stable/c/a12b1575f9feabd91…
https://git.kernel.org/stable/c/ff39d0e3b4feeb65c…
https://git.kernel.org/stable/c/888706a76286c547b…
https://git.kernel.org/stable/c/db77b6bb6e6edb79b…
https://git.kernel.org/stable/c/4e40056bb5c829f04…
https://git.kernel.org/stable/c/bd004716ba75fed6d…
https://git.kernel.org/stable/c/0c0a8ed85349dae29…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5 (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < a12b1575f9feabd91695a9e9d004862f7195fa25 (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 888706a76286c547bd035432602571e8024b5305 (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < db77b6bb6e6edb79b10b4efcce346eec5582d588 (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 4e40056bb5c829f0423f0a6694a0477726d2147e (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < bd004716ba75fed6d185795c85cdc92540ebeaab (git) Affected: 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 , < 0c0a8ed85349dae298712d79cb276acfeb794d82 (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f1644c9508d24f50dd9e8ebe8d3ba86e0996d2f5",
              "status": "affected",
              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
            },
            {
              "lessThan": "a12b1575f9feabd91695a9e9d004862f7195fa25",
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              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
            },
            {
              "lessThan": "ff39d0e3b4feeb65ca43c453d7c75fdf872ded0d",
              "status": "affected",
              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
            },
            {
              "lessThan": "888706a76286c547bd035432602571e8024b5305",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "db77b6bb6e6edb79b10b4efcce346eec5582d588",
              "status": "affected",
              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
            },
            {
              "lessThan": "4e40056bb5c829f0423f0a6694a0477726d2147e",
              "status": "affected",
              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
            },
            {
              "lessThan": "bd004716ba75fed6d185795c85cdc92540ebeaab",
              "status": "affected",
              "version": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28",
              "versionType": "git"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
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                {
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                },
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                }
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T20:10:38.355Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/bd004716ba75fed6d185795c85cdc92540ebeaab"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c0a8ed85349dae298712d79cb276acfeb794d82"
        }
      ],
      "title": "bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64548",
    "datePublished": "2026-07-27T20:10:38.355Z",
    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-07-27T20:10:38.355Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

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GHSA-V3W7-WGCW-WJF2

CVE-2026-64548 (GCVE-0-2026-64548)

Tags

Sightings

Nomenclature