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CVE-2024-43878 (GCVE-0-2024-43878)

Vulnerability from cvelistv5 – Published: 2024-08-21 00:06 – Updated: 2026-08-05 11:36
VLAI
Title
xfrm: Fix input error path memory access
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix input error path memory access When there is a misconfiguration of input state slow path KASAN report error. Fix this error. west login: [ 52.987278] eth1: renamed from veth11 [ 53.078814] eth1: renamed from veth21 [ 53.181355] eth1: renamed from veth31 [ 54.921702] ================================================================== [ 54.922602] BUG: KASAN: wild-memory-access in xfrmi_rcv_cb+0x2d/0x295 [ 54.923393] Read of size 8 at addr 6b6b6b6b00000000 by task ping/512 [ 54.924169] [ 54.924386] CPU: 0 PID: 512 Comm: ping Not tainted 6.9.0-08574-gcd29a4313a1b #25 [ 54.925290] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 54.926401] Call Trace: [ 54.926731] <IRQ> [ 54.927009] dump_stack_lvl+0x2a/0x3b [ 54.927478] kasan_report+0x84/0xa6 [ 54.927930] ? xfrmi_rcv_cb+0x2d/0x295 [ 54.928410] xfrmi_rcv_cb+0x2d/0x295 [ 54.928872] ? xfrm4_rcv_cb+0x3d/0x5e [ 54.929354] xfrm4_rcv_cb+0x46/0x5e [ 54.929804] xfrm_rcv_cb+0x7e/0xa1 [ 54.930240] xfrm_input+0x1b3a/0x1b96 [ 54.930715] ? xfrm_offload+0x41/0x41 [ 54.931182] ? raw_rcv+0x292/0x292 [ 54.931617] ? nf_conntrack_confirm+0xa2/0xa2 [ 54.932158] ? skb_sec_path+0xd/0x3f [ 54.932610] ? xfrmi_input+0x90/0xce [ 54.933066] xfrm4_esp_rcv+0x33/0x54 [ 54.933521] ip_protocol_deliver_rcu+0xd7/0x1b2 [ 54.934089] ip_local_deliver_finish+0x110/0x120 [ 54.934659] ? ip_protocol_deliver_rcu+0x1b2/0x1b2 [ 54.935248] NF_HOOK.constprop.0+0xf8/0x138 [ 54.935767] ? ip_sublist_rcv_finish+0x68/0x68 [ 54.936317] ? secure_tcpv6_ts_off+0x23/0x168 [ 54.936859] ? ip_protocol_deliver_rcu+0x1b2/0x1b2 [ 54.937454] ? __xfrm_policy_check2.constprop.0+0x18d/0x18d [ 54.938135] NF_HOOK.constprop.0+0xf8/0x138 [ 54.938663] ? ip_sublist_rcv_finish+0x68/0x68 [ 54.939220] ? __xfrm_policy_check2.constprop.0+0x18d/0x18d [ 54.939904] ? ip_local_deliver_finish+0x120/0x120 [ 54.940497] __netif_receive_skb_one_core+0xc9/0x107 [ 54.941121] ? __netif_receive_skb_list_core+0x1c2/0x1c2 [ 54.941771] ? blk_mq_start_stopped_hw_queues+0xc7/0xf9 [ 54.942413] ? blk_mq_start_stopped_hw_queue+0x38/0x38 [ 54.943044] ? virtqueue_get_buf_ctx+0x295/0x46b [ 54.943618] process_backlog+0xb3/0x187 [ 54.944102] __napi_poll.constprop.0+0x57/0x1a7 [ 54.944669] net_rx_action+0x1cb/0x380 [ 54.945150] ? __napi_poll.constprop.0+0x1a7/0x1a7 [ 54.945744] ? vring_new_virtqueue+0x17a/0x17a [ 54.946300] ? note_interrupt+0x2cd/0x367 [ 54.946805] handle_softirqs+0x13c/0x2c9 [ 54.947300] do_softirq+0x5f/0x7d [ 54.947727] </IRQ> [ 54.948014] <TASK> [ 54.948300] __local_bh_enable_ip+0x48/0x62 [ 54.948832] __neigh_event_send+0x3fd/0x4ca [ 54.949361] neigh_resolve_output+0x1e/0x210 [ 54.949896] ip_finish_output2+0x4bf/0x4f0 [ 54.950410] ? __ip_finish_output+0x171/0x1b8 [ 54.950956] ip_send_skb+0x25/0x57 [ 54.951390] raw_sendmsg+0xf95/0x10c0 [ 54.951850] ? check_new_pages+0x45/0x71 [ 54.952343] ? raw_hash_sk+0x21b/0x21b [ 54.952815] ? kernel_init_pages+0x42/0x51 [ 54.953337] ? prep_new_page+0x44/0x51 [ 54.953811] ? get_page_from_freelist+0x72b/0x915 [ 54.954390] ? signal_pending_state+0x77/0x77 [ 54.954936] ? preempt_count_sub+0x14/0xb3 [ 54.955450] ? __might_resched+0x8a/0x240 [ 54.955951] ? __might_sleep+0x25/0xa0 [ 54.956424] ? first_zones_zonelist+0x2c/0x43 [ 54.956977] ? __rcu_read_lock+0x2d/0x3a [ 54.957476] ? __pte_offset_map+0x32/0xa4 [ 54.957980] ? __might_resched+0x8a/0x240 [ 54.958483] ? __might_sleep+0x25/0xa0 [ 54.958963] ? inet_send_prepare+0x54/0x54 [ 54.959478] ? sock_sendmsg_nosec+0x42/0x6c [ 54.960000] sock_sendmsg_nosec+0x42/0x6c [ 54.960502] __sys_sendto+0x15d/0x1cc [ 54.960966] ? __x64_sys_getpeername+0x44/0x44 [ 54.961522] ? __handle_mm_fault+0x679/0xae4 [ 54.962068] ? find_vma+0x6b/0x ---truncated---
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 16:05 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 304b44f0d5a4c2f91f82f7c31538d00485fb484c , < a4c10813bc394ff2b5c61f913971be216f8f8834 (git)
Affected: 304b44f0d5a4c2f91f82f7c31538d00485fb484c , < 54fcc6189dfb822eea984fa2b3e477a02447279d (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.10.3 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-43878",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:05:57.570463Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-12T17:33:17.625Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a4c10813bc394ff2b5c61f913971be216f8f8834",
              "status": "affected",
              "version": "304b44f0d5a4c2f91f82f7c31538d00485fb484c",
              "versionType": "git"
            },
            {
              "lessThan": "54fcc6189dfb822eea984fa2b3e477a02447279d",
              "status": "affected",
              "version": "304b44f0d5a4c2f91f82f7c31538d00485fb484c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_input.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.10.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: Fix input error path memory access\n\nWhen there is a misconfiguration of input state slow path\nKASAN report error. Fix this error.\nwest login:\n[   52.987278] eth1: renamed from veth11\n[   53.078814] eth1: renamed from veth21\n[   53.181355] eth1: renamed from veth31\n[   54.921702] ==================================================================\n[   54.922602] BUG: KASAN: wild-memory-access in xfrmi_rcv_cb+0x2d/0x295\n[   54.923393] Read of size 8 at addr 6b6b6b6b00000000 by task ping/512\n[   54.924169]\n[   54.924386] CPU: 0 PID: 512 Comm: ping Not tainted 6.9.0-08574-gcd29a4313a1b #25\n[   54.925290] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   54.926401] Call Trace:\n[   54.926731]  \u003cIRQ\u003e\n[   54.927009]  dump_stack_lvl+0x2a/0x3b\n[   54.927478]  kasan_report+0x84/0xa6\n[   54.927930]  ? xfrmi_rcv_cb+0x2d/0x295\n[   54.928410]  xfrmi_rcv_cb+0x2d/0x295\n[   54.928872]  ? xfrm4_rcv_cb+0x3d/0x5e\n[   54.929354]  xfrm4_rcv_cb+0x46/0x5e\n[   54.929804]  xfrm_rcv_cb+0x7e/0xa1\n[   54.930240]  xfrm_input+0x1b3a/0x1b96\n[   54.930715]  ? xfrm_offload+0x41/0x41\n[   54.931182]  ? raw_rcv+0x292/0x292\n[   54.931617]  ? nf_conntrack_confirm+0xa2/0xa2\n[   54.932158]  ? skb_sec_path+0xd/0x3f\n[   54.932610]  ? xfrmi_input+0x90/0xce\n[   54.933066]  xfrm4_esp_rcv+0x33/0x54\n[   54.933521]  ip_protocol_deliver_rcu+0xd7/0x1b2\n[   54.934089]  ip_local_deliver_finish+0x110/0x120\n[   54.934659]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\n[   54.935248]  NF_HOOK.constprop.0+0xf8/0x138\n[   54.935767]  ? ip_sublist_rcv_finish+0x68/0x68\n[   54.936317]  ? secure_tcpv6_ts_off+0x23/0x168\n[   54.936859]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\n[   54.937454]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\n[   54.938135]  NF_HOOK.constprop.0+0xf8/0x138\n[   54.938663]  ? ip_sublist_rcv_finish+0x68/0x68\n[   54.939220]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\n[   54.939904]  ? ip_local_deliver_finish+0x120/0x120\n[   54.940497]  __netif_receive_skb_one_core+0xc9/0x107\n[   54.941121]  ? __netif_receive_skb_list_core+0x1c2/0x1c2\n[   54.941771]  ? blk_mq_start_stopped_hw_queues+0xc7/0xf9\n[   54.942413]  ? blk_mq_start_stopped_hw_queue+0x38/0x38\n[   54.943044]  ? virtqueue_get_buf_ctx+0x295/0x46b\n[   54.943618]  process_backlog+0xb3/0x187\n[   54.944102]  __napi_poll.constprop.0+0x57/0x1a7\n[   54.944669]  net_rx_action+0x1cb/0x380\n[   54.945150]  ? __napi_poll.constprop.0+0x1a7/0x1a7\n[   54.945744]  ? vring_new_virtqueue+0x17a/0x17a\n[   54.946300]  ? note_interrupt+0x2cd/0x367\n[   54.946805]  handle_softirqs+0x13c/0x2c9\n[   54.947300]  do_softirq+0x5f/0x7d\n[   54.947727]  \u003c/IRQ\u003e\n[   54.948014]  \u003cTASK\u003e\n[   54.948300]  __local_bh_enable_ip+0x48/0x62\n[   54.948832]  __neigh_event_send+0x3fd/0x4ca\n[   54.949361]  neigh_resolve_output+0x1e/0x210\n[   54.949896]  ip_finish_output2+0x4bf/0x4f0\n[   54.950410]  ? __ip_finish_output+0x171/0x1b8\n[   54.950956]  ip_send_skb+0x25/0x57\n[   54.951390]  raw_sendmsg+0xf95/0x10c0\n[   54.951850]  ? check_new_pages+0x45/0x71\n[   54.952343]  ? raw_hash_sk+0x21b/0x21b\n[   54.952815]  ? kernel_init_pages+0x42/0x51\n[   54.953337]  ? prep_new_page+0x44/0x51\n[   54.953811]  ? get_page_from_freelist+0x72b/0x915\n[   54.954390]  ? signal_pending_state+0x77/0x77\n[   54.954936]  ? preempt_count_sub+0x14/0xb3\n[   54.955450]  ? __might_resched+0x8a/0x240\n[   54.955951]  ? __might_sleep+0x25/0xa0\n[   54.956424]  ? first_zones_zonelist+0x2c/0x43\n[   54.956977]  ? __rcu_read_lock+0x2d/0x3a\n[   54.957476]  ? __pte_offset_map+0x32/0xa4\n[   54.957980]  ? __might_resched+0x8a/0x240\n[   54.958483]  ? __might_sleep+0x25/0xa0\n[   54.958963]  ? inet_send_prepare+0x54/0x54\n[   54.959478]  ? sock_sendmsg_nosec+0x42/0x6c\n[   54.960000]  sock_sendmsg_nosec+0x42/0x6c\n[   54.960502]  __sys_sendto+0x15d/0x1cc\n[   54.960966]  ? __x64_sys_getpeername+0x44/0x44\n[   54.961522]  ? __handle_mm_fault+0x679/0xae4\n[   54.962068]  ? find_vma+0x6b/0x\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The defect is in the IPsec receive path (`xfrm_input`), reached via `ip_local_deliver_finish` \u2192 `xfrm4_esp_rcv` for any ESP/AH packet arriving from the network; a single unauthenticated ESP datagram sent to the host triggers it, with no local access required.\nAC:H - The target must hold an XFRM SA carrying the `XFRM_SA_DIR_OUT` attribute whose daddr/SPI/proto match an inbound lookup \u2014 a state configuration the attacker cannot create \u2014 and the attacker must supply the matching 32-bit SPI, so success depends on conditions outside attacker control.\nPR:N - The direction check that leads to the bad `drop` path executes right after the SAD lookup and before any ICV/crypto verification, so an entirely unauthenticated remote sender reaches it; no credentials or valid SA keying material are needed.\nUI:N - The packet is processed in softirq context by the network receive path with no victim action of any kind; no user must open, mount, or interact with anything.\nS:U - The out-of-bounds read, wild-pointer dereference, and resulting panic all occur within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - `xfrm_input_state()` reads `sp-\u003exvec[-1]` \u2014 uninitialized heap padding \u2014 and the resulting pointer is dereferenced as a `struct xfrm_state`, reading arbitrary kernel addresses (`xs_net(x)`, `net_generic()`, list traversal, `x-\u003eif_id`) whose contents steer subsequent processing, giving an unbounded kernel-memory read primitive.\nI:H - If the wild `xfrm_state` pointer yields a non-NULL `xi`, `xfrmi_rcv_cb()` executes `DEV_STATS_INC(dev, rx_errors)`/`rx_dropped` \u2014 `atomic_long_inc()` through an uncontrolled `dev` pointer \u2014 and `skb-\u003edev` is reassigned to it, so the type confusion provides a memory-corrupting write whose high 32 bits derive from groomable recycled heap data.\nA:H - The reported outcome is a fatal exception in interrupt context (`Kernel panic - not syncing: Fatal exception in interrupt`), taking down the entire machine, and it can be re-triggered by every matching packet."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:36:54.502Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a4c10813bc394ff2b5c61f913971be216f8f8834"
        },
        {
          "url": "https://git.kernel.org/stable/c/54fcc6189dfb822eea984fa2b3e477a02447279d"
        }
      ],
      "title": "xfrm: Fix input error path memory access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-43878",
    "datePublished": "2024-08-21T00:06:30.412Z",
    "dateReserved": "2024-08-17T09:11:59.286Z",
    "dateUpdated": "2026-08-05T11:36:54.502Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-43878",
      "date": "2026-09-17",
      "epss": "0.00412",
      "percentile": "0.35012"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-43878\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-08-21T01:15:12.093\",\"lastModified\":\"2026-08-04T11:19:56.873\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: Fix input error path memory access\\n\\nWhen there is a misconfiguration of input state slow path\\nKASAN report error. Fix this error.\\nwest login:\\n[   52.987278] eth1: renamed from veth11\\n[   53.078814] eth1: renamed from veth21\\n[   53.181355] eth1: renamed from veth31\\n[   54.921702] ==================================================================\\n[   54.922602] BUG: KASAN: wild-memory-access in xfrmi_rcv_cb+0x2d/0x295\\n[   54.923393] Read of size 8 at addr 6b6b6b6b00000000 by task ping/512\\n[   54.924169]\\n[   54.924386] CPU: 0 PID: 512 Comm: ping Not tainted 6.9.0-08574-gcd29a4313a1b #25\\n[   54.925290] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   54.926401] Call Trace:\\n[   54.926731]  \u003cIRQ\u003e\\n[   54.927009]  dump_stack_lvl+0x2a/0x3b\\n[   54.927478]  kasan_report+0x84/0xa6\\n[   54.927930]  ? xfrmi_rcv_cb+0x2d/0x295\\n[   54.928410]  xfrmi_rcv_cb+0x2d/0x295\\n[   54.928872]  ? xfrm4_rcv_cb+0x3d/0x5e\\n[   54.929354]  xfrm4_rcv_cb+0x46/0x5e\\n[   54.929804]  xfrm_rcv_cb+0x7e/0xa1\\n[   54.930240]  xfrm_input+0x1b3a/0x1b96\\n[   54.930715]  ? xfrm_offload+0x41/0x41\\n[   54.931182]  ? raw_rcv+0x292/0x292\\n[   54.931617]  ? nf_conntrack_confirm+0xa2/0xa2\\n[   54.932158]  ? skb_sec_path+0xd/0x3f\\n[   54.932610]  ? xfrmi_input+0x90/0xce\\n[   54.933066]  xfrm4_esp_rcv+0x33/0x54\\n[   54.933521]  ip_protocol_deliver_rcu+0xd7/0x1b2\\n[   54.934089]  ip_local_deliver_finish+0x110/0x120\\n[   54.934659]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\\n[   54.935248]  NF_HOOK.constprop.0+0xf8/0x138\\n[   54.935767]  ? ip_sublist_rcv_finish+0x68/0x68\\n[   54.936317]  ? secure_tcpv6_ts_off+0x23/0x168\\n[   54.936859]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\\n[   54.937454]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\\n[   54.938135]  NF_HOOK.constprop.0+0xf8/0x138\\n[   54.938663]  ? ip_sublist_rcv_finish+0x68/0x68\\n[   54.939220]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\\n[   54.939904]  ? ip_local_deliver_finish+0x120/0x120\\n[   54.940497]  __netif_receive_skb_one_core+0xc9/0x107\\n[   54.941121]  ? __netif_receive_skb_list_core+0x1c2/0x1c2\\n[   54.941771]  ? blk_mq_start_stopped_hw_queues+0xc7/0xf9\\n[   54.942413]  ? blk_mq_start_stopped_hw_queue+0x38/0x38\\n[   54.943044]  ? virtqueue_get_buf_ctx+0x295/0x46b\\n[   54.943618]  process_backlog+0xb3/0x187\\n[   54.944102]  __napi_poll.constprop.0+0x57/0x1a7\\n[   54.944669]  net_rx_action+0x1cb/0x380\\n[   54.945150]  ? __napi_poll.constprop.0+0x1a7/0x1a7\\n[   54.945744]  ? vring_new_virtqueue+0x17a/0x17a\\n[   54.946300]  ? note_interrupt+0x2cd/0x367\\n[   54.946805]  handle_softirqs+0x13c/0x2c9\\n[   54.947300]  do_softirq+0x5f/0x7d\\n[   54.947727]  \u003c/IRQ\u003e\\n[   54.948014]  \u003cTASK\u003e\\n[   54.948300]  __local_bh_enable_ip+0x48/0x62\\n[   54.948832]  __neigh_event_send+0x3fd/0x4ca\\n[   54.949361]  neigh_resolve_output+0x1e/0x210\\n[   54.949896]  ip_finish_output2+0x4bf/0x4f0\\n[   54.950410]  ? __ip_finish_output+0x171/0x1b8\\n[   54.950956]  ip_send_skb+0x25/0x57\\n[   54.951390]  raw_sendmsg+0xf95/0x10c0\\n[   54.951850]  ? check_new_pages+0x45/0x71\\n[   54.952343]  ? raw_hash_sk+0x21b/0x21b\\n[   54.952815]  ? kernel_init_pages+0x42/0x51\\n[   54.953337]  ? prep_new_page+0x44/0x51\\n[   54.953811]  ? get_page_from_freelist+0x72b/0x915\\n[   54.954390]  ? signal_pending_state+0x77/0x77\\n[   54.954936]  ? preempt_count_sub+0x14/0xb3\\n[   54.955450]  ? __might_resched+0x8a/0x240\\n[   54.955951]  ? __might_sleep+0x25/0xa0\\n[   54.956424]  ? first_zones_zonelist+0x2c/0x43\\n[   54.956977]  ? __rcu_read_lock+0x2d/0x3a\\n[   54.957476]  ? __pte_offset_map+0x32/0xa4\\n[   54.957980]  ? __might_resched+0x8a/0x240\\n[   54.958483]  ? __might_sleep+0x25/0xa0\\n[   54.958963]  ? inet_send_prepare+0x54/0x54\\n[   54.959478]  ? sock_sendmsg_nosec+0x42/0x6c\\n[   54.960000]  sock_sendmsg_nosec+0x42/0x6c\\n[   54.960502]  __sys_sendto+0x15d/0x1cc\\n[   54.960966]  ? __x64_sys_getpeername+0x44/0x44\\n[   54.961522]  ? __handle_mm_fault+0x679/0xae4\\n[   54.962068]  ? find_vma+0x6b/0x\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xfrm: corrige el error de acceso a la memoria de la ruta de entrada Cuando hay una mala configuraci\u00f3n del estado de entrada, la ruta lenta KASAN informa el error. Corrija este error. inicio de sesi\u00f3n oeste: [52.987278] eth1: renombrado de veth11 [53.078814] eth1: renombrado de veth21 [53.181355] eth1: renombrado de veth31 [54.921702] ===================== =============================================== [ 54.922602] ERROR : KASAN: acceso a memoria salvaje en xfrmi_rcv_cb+0x2d/0x295 [ 54.923393] Lectura de tama\u00f1o 8 en la direcci\u00f3n 6b6b6b6b00000000 mediante tarea ping/512 [ 54.924169] [ 54.924386] CPU: 0 PID: 512 Comm: ping No contaminado 6. 9.0- 08574-gcd29a4313a1b #25 [ 54.925290] Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 01/04/2014 [ 54.926401] Seguimiento de llamadas: [ 54.926731]  [54.927009] dump_stack_lvl+0x2a/0x3b [54.927478] kasan_report+0x84/0xa6 [54.927930]? xfrmi_rcv_cb+0x2d/0x295 [ 54.928410] xfrmi_rcv_cb+0x2d/0x295 [ 54.928872] ? xfrm4_rcv_cb+0x3d/0x5e [ 54.929354] xfrm4_rcv_cb+0x46/0x5e [ 54.929804] xfrm_rcv_cb+0x7e/0xa1 [ 54.930240] xfrm_input+0x1b3a/0x1b96 [ 54.930715] ? xfrm_offload+0x41/0x41 [54.931182]? raw_rcv+0x292/0x292 [54.931617]? nf_conntrack_confirm+0xa2/0xa2 [54.932158]? skb_sec_path+0xd/0x3f [54.932610]? xfrmi_input+0x90/0xce [ 54.933066] xfrm4_esp_rcv+0x33/0x54 [ 54.933521] ip_protocol_deliver_rcu+0xd7/0x1b2 [ 54.934089] ip_local_deliver_finish+0x110/0x120 [ 54.93 4659] ? ip_protocol_deliver_rcu+0x1b2/0x1b2 [ 54.935248] NF_HOOK.constprop.0+0xf8/0x138 [ 54.935767] ? ip_sublist_rcv_finish+0x68/0x68 [54.936317]? \u00bfsecure_tcpv6_ts_off+0x23/0x168 [54.936859]? ip_protocol_deliver_rcu+0x1b2/0x1b2 [54.937454]? __xfrm_policy_check2.constprop.0+0x18d/0x18d [ 54.938135] NF_HOOK.constprop.0+0xf8/0x138 [ 54.938663] ? ip_sublist_rcv_finish+0x68/0x68 [54.939220]? __xfrm_policy_check2.constprop.0+0x18d/0x18d [54.939904]? ip_local_deliver_finish+0x120/0x120 [ 54.940497] __netif_receive_skb_one_core+0xc9/0x107 [ 54.941121] ? __netif_receive_skb_list_core+0x1c2/0x1c2 [54.941771]? blk_mq_start_stopped_hw_queues+0xc7/0xf9 [54.942413]? blk_mq_start_stopped_hw_queue+0x38/0x38 [54.943044]? virtqueue_get_buf_ctx+0x295/0x46b [ 54.943618] Process_backlog+0xb3/0x187 [ 54.944102] __napi_poll.constprop.0+0x57/0x1a7 [ 54.944669] net_rx_action+0x1cb/0x380 [ 54.94 5150] ? __napi_poll.constprop.0+0x1a7/0x1a7 [54.945744]? vring_new_virtqueue+0x17a/0x17a [54.946300]? note_interrupt+0x2cd/0x367 [ 54.946805] handle_softirqs+0x13c/0x2c9 [ 54.947300] do_softirq+0x5f/0x7d [ 54.947727]  [ 54.948014]  [ 54.948300] _enable_ip+0x48/0x62 [ 54.948832] __neigh_event_send+0x3fd/0x4ca [ 54.949361] neigh_resolve_output+0x1e/0x210 [ 54.949896] ip_finish_output2+0x4bf/0x4f0 [ 54.950410] ? __ip_finish_output+0x171/0x1b8 [ 54.950956] ip_send_skb+0x25/0x57 [ 54.951390] raw_sendmsg+0xf95/0x10c0 [ 54.951850] ? check_new_pages+0x45/0x71 [ 54.952343] ? raw_hash_sk+0x21b/0x21b [54.952815]? kernel_init_pages+0x42/0x51 [54.953337]? prep_new_page+0x44/0x51 [54.953811]? get_page_from_freelist+0x72b/0x915 [54.954390]? signal_pending_state+0x77/0x77 [54.954936]? preempt_count_sub+0x14/0xb3 [54.955450]? __might_resched+0x8a/0x240 [ 54.955951] ? __might_sleep+0x25/0xa0 [ 54.956424] ? first_zones_zonelist+0x2c/0x43 [ 54.956977] ? __rcu_read_lock+0x2d/0x3a [ 54.957476] ? __pte_offset_map+0x32/0xa4 [54.957980]? __might_resched+0x8a/0x240 [ 54.958483] ? __might_sleep+0x25/0xa0 [ 54.958963] ? inet_send_prepare+0x54/0x54 [54.959478]? sock_sendmsg_nosec+0x42/0x6c [ 54.960000] sock_sendmsg_nosec+0x42/0x6c [ 54.960502] __sys_sendto+0x15d/0x1cc [ 54.960966] ? __x64_sys_getpeername+0x44/0x44 [ 54.961522] ? __handle_mm_fault+0x679/0xae4 [ 54.962068] ? find_vma+0x6b/0x ---truncado---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/xfrm_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"304b44f0d5a4c2f91f82f7c31538d00485fb484c\",\"lessThan\":\"a4c10813bc394ff2b5c61f913971be216f8f8834\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"304b44f0d5a4c2f91f82f7c31538d00485fb484c\",\"lessThan\":\"54fcc6189dfb822eea984fa2b3e477a02447279d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/xfrm_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.10.3\",\"lessThanOrEqual\":\"6.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T16:05:57.570463Z\",\"id\":\"CVE-2024-43878\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.10\",\"versionEndExcluding\":\"6.10.3\",\"matchCriteriaId\":\"21DC7A88-E88C-4C44-9AFB-CBB30134097C\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/54fcc6189dfb822eea984fa2b3e477a02447279d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a4c10813bc394ff2b5c61f913971be216f8f8834\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:13:15+00:00",
      "cve": "CVE-2024-43878",
      "id": "CVE-2024-43878",
      "initial_release_date": "2024-08-21T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xfrm: Fix input error path memory access",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-43878.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-43878\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:05:57.570463Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:22.606Z\"}}], \"cna\": {\"title\": \"xfrm: Fix input error path memory access\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"304b44f0d5a4c2f91f82f7c31538d00485fb484c\", \"lessThan\": \"a4c10813bc394ff2b5c61f913971be216f8f8834\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"304b44f0d5a4c2f91f82f7c31538d00485fb484c\", \"lessThan\": \"54fcc6189dfb822eea984fa2b3e477a02447279d\", \"versionType\": \"git\"}], \"programFiles\": [\"net/xfrm/xfrm_input.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.10.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/xfrm/xfrm_input.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a4c10813bc394ff2b5c61f913971be216f8f8834\"}, {\"url\": \"https://git.kernel.org/stable/c/54fcc6189dfb822eea984fa2b3e477a02447279d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: Fix input error path memory access\\n\\nWhen there is a misconfiguration of input state slow path\\nKASAN report error. Fix this error.\\nwest login:\\n[   52.987278] eth1: renamed from veth11\\n[   53.078814] eth1: renamed from veth21\\n[   53.181355] eth1: renamed from veth31\\n[   54.921702] ==================================================================\\n[   54.922602] BUG: KASAN: wild-memory-access in xfrmi_rcv_cb+0x2d/0x295\\n[   54.923393] Read of size 8 at addr 6b6b6b6b00000000 by task ping/512\\n[   54.924169]\\n[   54.924386] CPU: 0 PID: 512 Comm: ping Not tainted 6.9.0-08574-gcd29a4313a1b #25\\n[   54.925290] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[   54.926401] Call Trace:\\n[   54.926731]  \u003cIRQ\u003e\\n[   54.927009]  dump_stack_lvl+0x2a/0x3b\\n[   54.927478]  kasan_report+0x84/0xa6\\n[   54.927930]  ? xfrmi_rcv_cb+0x2d/0x295\\n[   54.928410]  xfrmi_rcv_cb+0x2d/0x295\\n[   54.928872]  ? xfrm4_rcv_cb+0x3d/0x5e\\n[   54.929354]  xfrm4_rcv_cb+0x46/0x5e\\n[   54.929804]  xfrm_rcv_cb+0x7e/0xa1\\n[   54.930240]  xfrm_input+0x1b3a/0x1b96\\n[   54.930715]  ? xfrm_offload+0x41/0x41\\n[   54.931182]  ? raw_rcv+0x292/0x292\\n[   54.931617]  ? nf_conntrack_confirm+0xa2/0xa2\\n[   54.932158]  ? skb_sec_path+0xd/0x3f\\n[   54.932610]  ? xfrmi_input+0x90/0xce\\n[   54.933066]  xfrm4_esp_rcv+0x33/0x54\\n[   54.933521]  ip_protocol_deliver_rcu+0xd7/0x1b2\\n[   54.934089]  ip_local_deliver_finish+0x110/0x120\\n[   54.934659]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\\n[   54.935248]  NF_HOOK.constprop.0+0xf8/0x138\\n[   54.935767]  ? ip_sublist_rcv_finish+0x68/0x68\\n[   54.936317]  ? secure_tcpv6_ts_off+0x23/0x168\\n[   54.936859]  ? ip_protocol_deliver_rcu+0x1b2/0x1b2\\n[   54.937454]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\\n[   54.938135]  NF_HOOK.constprop.0+0xf8/0x138\\n[   54.938663]  ? ip_sublist_rcv_finish+0x68/0x68\\n[   54.939220]  ? __xfrm_policy_check2.constprop.0+0x18d/0x18d\\n[   54.939904]  ? ip_local_deliver_finish+0x120/0x120\\n[   54.940497]  __netif_receive_skb_one_core+0xc9/0x107\\n[   54.941121]  ? __netif_receive_skb_list_core+0x1c2/0x1c2\\n[   54.941771]  ? blk_mq_start_stopped_hw_queues+0xc7/0xf9\\n[   54.942413]  ? blk_mq_start_stopped_hw_queue+0x38/0x38\\n[   54.943044]  ? virtqueue_get_buf_ctx+0x295/0x46b\\n[   54.943618]  process_backlog+0xb3/0x187\\n[   54.944102]  __napi_poll.constprop.0+0x57/0x1a7\\n[   54.944669]  net_rx_action+0x1cb/0x380\\n[   54.945150]  ? __napi_poll.constprop.0+0x1a7/0x1a7\\n[   54.945744]  ? vring_new_virtqueue+0x17a/0x17a\\n[   54.946300]  ? note_interrupt+0x2cd/0x367\\n[   54.946805]  handle_softirqs+0x13c/0x2c9\\n[   54.947300]  do_softirq+0x5f/0x7d\\n[   54.947727]  \u003c/IRQ\u003e\\n[   54.948014]  \u003cTASK\u003e\\n[   54.948300]  __local_bh_enable_ip+0x48/0x62\\n[   54.948832]  __neigh_event_send+0x3fd/0x4ca\\n[   54.949361]  neigh_resolve_output+0x1e/0x210\\n[   54.949896]  ip_finish_output2+0x4bf/0x4f0\\n[   54.950410]  ? __ip_finish_output+0x171/0x1b8\\n[   54.950956]  ip_send_skb+0x25/0x57\\n[   54.951390]  raw_sendmsg+0xf95/0x10c0\\n[   54.951850]  ? check_new_pages+0x45/0x71\\n[   54.952343]  ? raw_hash_sk+0x21b/0x21b\\n[   54.952815]  ? kernel_init_pages+0x42/0x51\\n[   54.953337]  ? prep_new_page+0x44/0x51\\n[   54.953811]  ? get_page_from_freelist+0x72b/0x915\\n[   54.954390]  ? signal_pending_state+0x77/0x77\\n[   54.954936]  ? preempt_count_sub+0x14/0xb3\\n[   54.955450]  ? __might_resched+0x8a/0x240\\n[   54.955951]  ? __might_sleep+0x25/0xa0\\n[   54.956424]  ? first_zones_zonelist+0x2c/0x43\\n[   54.956977]  ? __rcu_read_lock+0x2d/0x3a\\n[   54.957476]  ? __pte_offset_map+0x32/0xa4\\n[   54.957980]  ? __might_resched+0x8a/0x240\\n[   54.958483]  ? __might_sleep+0x25/0xa0\\n[   54.958963]  ? inet_send_prepare+0x54/0x54\\n[   54.959478]  ? sock_sendmsg_nosec+0x42/0x6c\\n[   54.960000]  sock_sendmsg_nosec+0x42/0x6c\\n[   54.960502]  __sys_sendto+0x15d/0x1cc\\n[   54.960966]  ? __x64_sys_getpeername+0x44/0x44\\n[   54.961522]  ? __handle_mm_fault+0x679/0xae4\\n[   54.962068]  ? find_vma+0x6b/0x\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.3\", \"versionStartIncluding\": \"6.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"6.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:31:34.582Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-43878\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:31:34.582Z\", \"dateReserved\": \"2024-08-17T09:11:59.286Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-21T00:06:30.412Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.