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EUVD-2026-344678

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:57

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T07:57:28.495747+00:00",
  "id": "EUVD-2026-344678"
}

CVE-2022-49142 (GCVE-0-2022-49142)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:55 – Updated: 2026-10-03 10:54

Title

net: preserve skb_end_offset() in skb_unclone_keeptruesize()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: preserve skb_end_offset() in skb_unclone_keeptruesize() syzbot found another way to trigger the infamous WARN_ON_ONCE(delta < len) in skb_try_coalesce() [1] I was able to root cause the issue to kfence. When kfence is in action, the following assertion is no longer true: int size = xxxx; void *ptr1 = kmalloc(size, gfp); void *ptr2 = kmalloc(size, gfp); if (ptr1 && ptr2) ASSERT(ksize(ptr1) == ksize(ptr2)); We attempted to fix these issues in the blamed commits, but forgot that TCP was possibly shifting data after skb_unclone_keeptruesize() has been used, notably from tcp_retrans_try_collapse(). So we not only need to keep same skb->truesize value, we also need to make sure TCP wont fill new tailroom that pskb_expand_head() was able to get from a addr = kmalloc(...) followed by ksize(addr) Split skb_unclone_keeptruesize() into two parts: 1) Inline skb_unclone_keeptruesize() for the common case, when skb is not cloned. 2) Out of line __skb_unclone_keeptruesize() for the 'slow path'. WARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295 Modules linked in: CPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295 Code: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa <0f> 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa RSP: 0018:ffffc900063af268 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000 RDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003 RBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000 R10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8 R13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155 FS: 00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline] tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630 tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914 tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025 tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947 tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719 sk_backlog_rcv include/net/sock.h:1037 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2779 release_sock+0x54/0x1b0 net/core/sock.c:3311 sk_wait_data+0x177/0x450 net/core/sock.c:2821 tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457 tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:948 [inline] sock_recvmsg net/socket.c:966 [inline] sock_recvmsg net/socket.c:962 [inline] ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632 ___sys_recvmsg+0x127/0x200 net/socket.c:2674 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/91c118727432a5d77…
https://git.kernel.org/stable/c/23629b673b780d967…
https://git.kernel.org/stable/c/a9a6d30264327d8ff…
https://git.kernel.org/stable/c/a903e516f5df44b46…
https://git.kernel.org/stable/c/2b88cba55883eaafb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 35ca1748ebf8d3a1025d55c85f4b96add952ed20 , < 91c118727432a5d776d5fe86e0cf8eb1289ac1fc (git) Affected: 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 , < 23629b673b780d967b88a850b1518cf0f0ffc6aa (git) Affected: 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 , < a9a6d30264327d8ff7f23da33e7a77ffb793fa3f (git) Affected: 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 , < a903e516f5df44b46d526b403d93e7be1a425538 (git) Affected: 097b9146c0e26aabaa6ff3e5ea536a53f5254a79 , < 2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01 (git) Affected: 7118945cdf0d4b5a76eb4f5f330ac6f48d372025 (git) Affected: ec697f7f3f6a89d4dd1af113587d0330b5a033e8 (git) Affected: 7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5 (git) Affected: 5d55a6a46a7f70bc1d270c50200edd3096cb380c (git) Affected: e6af7cb64b7b37b8a371acdbe33a636496ffb5a4 (git) Affected: 97ff09a7ed484fef2b1bbc103857444b7332fca8 (git) Affected: bf5a58d143d7899d2c89e585be6e98ec81fe9683 (git) Affected: 4.4.260 , < 4.5 (semver) Affected: 4.9.260 , < 4.10 (semver) Affected: 4.14.224 , < 4.15 (semver) Affected: 4.19.179 , < 4.20 (semver) Affected: 5.4.103 , < 5.5 (semver) Affected: 5.11.4 , < 5.12 (semver)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.15.33 , ≤ 5.15.* (semver) Unaffected: 5.16.19 , ≤ 5.16.* (semver) Unaffected: 5.17.2 , ≤ 5.17.* (semver) Unaffected: 5.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/skbuff.h",
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "91c118727432a5d776d5fe86e0cf8eb1289ac1fc",
              "status": "affected",
              "version": "35ca1748ebf8d3a1025d55c85f4b96add952ed20",
              "versionType": "git"
            },
            {
              "lessThan": "23629b673b780d967b88a850b1518cf0f0ffc6aa",
              "status": "affected",
              "version": "097b9146c0e26aabaa6ff3e5ea536a53f5254a79",
              "versionType": "git"
            },
            {
              "lessThan": "a9a6d30264327d8ff7f23da33e7a77ffb793fa3f",
              "status": "affected",
              "version": "097b9146c0e26aabaa6ff3e5ea536a53f5254a79",
              "versionType": "git"
            },
            {
              "lessThan": "a903e516f5df44b46d526b403d93e7be1a425538",
              "status": "affected",
              "version": "097b9146c0e26aabaa6ff3e5ea536a53f5254a79",
              "versionType": "git"
            },
            {
              "lessThan": "2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01",
              "status": "affected",
              "version": "097b9146c0e26aabaa6ff3e5ea536a53f5254a79",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7118945cdf0d4b5a76eb4f5f330ac6f48d372025",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ec697f7f3f6a89d4dd1af113587d0330b5a033e8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7582edf28f5d1f0a4d2f7abdb7d9560d09fd41b5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5d55a6a46a7f70bc1d270c50200edd3096cb380c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e6af7cb64b7b37b8a371acdbe33a636496ffb5a4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "97ff09a7ed484fef2b1bbc103857444b7332fca8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bf5a58d143d7899d2c89e585be6e98ec81fe9683",
              "versionType": "git"
            },
            {
              "lessThan": "4.5",
              "status": "affected",
              "version": "4.4.260",
              "versionType": "semver"
            },
            {
              "lessThan": "4.10",
              "status": "affected",
              "version": "4.9.260",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.224",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.179",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.103",
              "versionType": "semver"
            },
            {
              "lessThan": "5.12",
              "status": "affected",
              "version": "5.11.4",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/skbuff.h",
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.33",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.19",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.2",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.4.260",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.9.260",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.224",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.179",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.103",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.11.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: preserve skb_end_offset() in skb_unclone_keeptruesize()\n\nsyzbot found another way to trigger the infamous WARN_ON_ONCE(delta \u003c len)\nin skb_try_coalesce() [1]\n\nI was able to root cause the issue to kfence.\n\nWhen kfence is in action, the following assertion is no longer true:\n\nint size = xxxx;\nvoid *ptr1 = kmalloc(size, gfp);\nvoid *ptr2 = kmalloc(size, gfp);\n\nif (ptr1 \u0026\u0026 ptr2)\n\tASSERT(ksize(ptr1) == ksize(ptr2));\n\nWe attempted to fix these issues in the blamed commits, but forgot\nthat TCP was possibly shifting data after skb_unclone_keeptruesize()\nhas been used, notably from tcp_retrans_try_collapse().\n\nSo we not only need to keep same skb-\u003etruesize value,\nwe also need to make sure TCP wont fill new tailroom\nthat pskb_expand_head() was able to get from a\naddr = kmalloc(...) followed by ksize(addr)\n\nSplit skb_unclone_keeptruesize() into two parts:\n\n1) Inline skb_unclone_keeptruesize() for the common case,\n   when skb is not cloned.\n\n2) Out of line __skb_unclone_keeptruesize() for the \u0027slow path\u0027.\n\nWARNING: CPU: 1 PID: 6490 at net/core/skbuff.c:5295 skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nModules linked in:\nCPU: 1 PID: 6490 Comm: syz-executor161 Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nRIP: 0010:skb_try_coalesce+0x1235/0x1560 net/core/skbuff.c:5295\nCode: bf 01 00 00 00 0f b7 c0 89 c6 89 44 24 20 e8 62 24 4e fa 8b 44 24 20 83 e8 01 0f 85 e5 f0 ff ff e9 87 f4 ff ff e8 cb 20 4e fa \u003c0f\u003e 0b e9 06 f9 ff ff e8 af b2 95 fa e9 69 f0 ff ff e8 95 b2 95 fa\nRSP: 0018:ffffc900063af268 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 00000000ffffffd5 RCX: 0000000000000000\nRDX: ffff88806fc05700 RSI: ffffffff872abd55 RDI: 0000000000000003\nRBP: ffff88806e675500 R08: 00000000ffffffd5 R09: 0000000000000000\nR10: ffffffff872ab659 R11: 0000000000000000 R12: ffff88806dd554e8\nR13: ffff88806dd9bac0 R14: ffff88806dd9a2c0 R15: 0000000000000155\nFS:  00007f18014f9700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020002000 CR3: 000000006be7a000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n tcp_try_coalesce net/ipv4/tcp_input.c:4651 [inline]\n tcp_try_coalesce+0x393/0x920 net/ipv4/tcp_input.c:4630\n tcp_queue_rcv+0x8a/0x6e0 net/ipv4/tcp_input.c:4914\n tcp_data_queue+0x11fd/0x4bb0 net/ipv4/tcp_input.c:5025\n tcp_rcv_established+0x81e/0x1ff0 net/ipv4/tcp_input.c:5947\n tcp_v4_do_rcv+0x65e/0x980 net/ipv4/tcp_ipv4.c:1719\n sk_backlog_rcv include/net/sock.h:1037 [inline]\n __release_sock+0x134/0x3b0 net/core/sock.c:2779\n release_sock+0x54/0x1b0 net/core/sock.c:3311\n sk_wait_data+0x177/0x450 net/core/sock.c:2821\n tcp_recvmsg_locked+0xe28/0x1fd0 net/ipv4/tcp.c:2457\n tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2572\n inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850\n sock_recvmsg_nosec net/socket.c:948 [inline]\n sock_recvmsg net/socket.c:966 [inline]\n sock_recvmsg net/socket.c:962 [inline]\n ____sys_recvmsg+0x2c4/0x600 net/socket.c:2632\n ___sys_recvmsg+0x127/0x200 net/socket.c:2674\n __sys_recvmsg+0xe2/0x1a0 net/socket.c:2704\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable skb_unclone_keeptruesize() path is reached while processing peer TCP behavior\u2014incoming SACKs/ACKs drive skb_prepare_for_shift/tcp_trim_head, and withheld ACKs drive retransmit collapse\u2014so a remote TCP peer can trigger it against a data-sending service.\nAC:L - The attacker controls connection traffic (SACK patterns, ACK withholding, retransmit pressure) that drives the unclone and collapse sequences; under a KFENCE-enabled deployment they can retry until a sampled allocation produces the size mismatch.\nPR:N - No privileges or authentication are required\u2014only an unauthenticated TCP session to a service that sends data (for example an internet-facing server), after which crafted peer packets exercise the vulnerable path.\nUI:N - Exploitation needs no victim user action beyond the already-running network service accepting and sending on the TCP connection.\nS:U - Impact stays within the same kernel networking authority; this is not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:N - The bug desynchronizes skb accounting metadata and trips WARN_ON_ONCE in skb_try_coalesce; it does not provide a usable kernel memory read or info-disclosure primitive.\nI:N - Extra tailroom comes from a legitimately larger kmalloc/ksize allocation rather than an out-of-bounds write or UAF, so there is no practical arbitrary-write or control-flow hijack primitive.\nA:H - The desync triggers WARN_ON_ONCE(delta \u003c len) (crash under panic_on_warn) and corrupts sk_buff/socket memory accounting, enabling connection or host denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-03T10:54:46.990Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/91c118727432a5d776d5fe86e0cf8eb1289ac1fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/23629b673b780d967b88a850b1518cf0f0ffc6aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9a6d30264327d8ff7f23da33e7a77ffb793fa3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/a903e516f5df44b46d526b403d93e7be1a425538"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b88cba55883eaafbc9b7cbff0b2c7cdba71ed01"
        }
      ],
      "title": "net: preserve skb_end_offset() in skb_unclone_keeptruesize()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49142",
    "datePublished": "2025-02-26T01:55:12.823Z",
    "dateReserved": "2025-02-26T01:49:39.269Z",
    "dateUpdated": "2026-10-03T10:54:46.990Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-344678

CVE-2022-49142 (GCVE-0-2022-49142)

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Related by attack behaviour