CVE-2023-53240 (GCVE-0-2023-53240)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:22 – Updated: 2026-05-23 15:28
VLAI
Title
xsk: check IFF_UP earlier in Tx path
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: check IFF_UP earlier in Tx path Xsk Tx can be triggered via either sendmsg() or poll() syscalls. These two paths share a call to common function xsk_xmit() which has two sanity checks within. A pseudo code example to show the two paths: __xsk_sendmsg() : xsk_poll(): if (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs))) return -ENXIO; return mask; if (unlikely(need_wait)) (...) return -EOPNOTSUPP; xsk_xmit() mark napi id (...) xsk_xmit() xsk_xmit(): if (unlikely(!(xs->dev->flags & IFF_UP))) return -ENETDOWN; if (unlikely(!xs->tx)) return -ENOBUFS; As it can be observed above, in sendmsg() napi id can be marked on interface that was not brought up and this causes a NULL ptr dereference: [31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018 [31757.512710] #PF: supervisor read access in kernel mode [31757.517936] #PF: error_code(0x0000) - not-present page [31757.523149] PGD 0 P4D 0 [31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI [31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40 [31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180 [31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 <8b> 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f [31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246 [31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000 [31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100 [31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000 [31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa [31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000 [31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000 [31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0 [31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [31757.648139] PKRU: 55555554 [31757.650894] Call Trace: [31757.653385] <TASK> [31757.655524] sock_sendmsg+0x8f/0xa0 [31757.659077] ? sockfd_lookup_light+0x12/0x70 [31757.663416] __sys_sendto+0xfc/0x170 [31757.667051] ? do_sched_setscheduler+0xdb/0x1b0 [31757.671658] __x64_sys_sendto+0x20/0x30 [31757.675557] do_syscall_64+0x38/0x90 [31757.679197] entry_SYSCALL_64_after_hwframe+0x72/0xdc [31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48 [31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16 [31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000 [31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000 [31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [31757.754940] </TASK> To fix this, let's make xsk_xmit a function that will be responsible for generic Tx, where RCU is handled accordingly and pull out sanity checks and xs->zc handling. Populate sanity checks to __xsk_sendmsg() and xsk_poll().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 , < cecc68559cd57fffb2be50685f262b9af2318e16 (git)
Affected: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 , < ffe19750e68d0bb21e8110b398346eef20b156a7 (git)
Affected: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 , < 1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b (git)
Affected: ad7219cd8751bd258b9d1e69ae0654ec00f71875 (git)
Affected: d1579253ffce39986e7a6ab757ac93b2680a665f (git)
Affected: 8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9 (git)
Affected: 5.15.33 , < 5.16 (semver)
Affected: 5.16.19 , < 5.17 (semver)
Affected: 5.17.2 , < 5.18 (semver)
Create a notification for this product.
Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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              "content": {
                "id": "CVE-2023-53240",
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                "role": "CISA Coordinator",
                "timestamp": "2026-01-14T17:57:36.337425Z",
                "version": "2.0.3"
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            }
          }
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            "descriptions": [
              {
                "cweId": "CWE-476",
                "description": "CWE-476 NULL Pointer Dereference",
                "lang": "en",
                "type": "CWE"
              }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-14T18:02:50.570Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
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          "programFiles": [
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.16",
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            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.16",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.3",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
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                  "versionEndExcluding": "6.3",
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                {
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                {
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: check IFF_UP earlier in Tx path\n\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\ntwo paths share a call to common function xsk_xmit() which has two\nsanity checks within. A pseudo code example to show the two paths:\n\n__xsk_sendmsg() :                       xsk_poll():\nif (unlikely(!xsk_is_bound(xs)))        if (unlikely(!xsk_is_bound(xs)))\n    return -ENXIO;                          return mask;\nif (unlikely(need_wait))                (...)\n    return -EOPNOTSUPP;                 xsk_xmit()\nmark napi id\n(...)\nxsk_xmit()\n\nxsk_xmit():\nif (unlikely(!(xs-\u003edev-\u003eflags \u0026 IFF_UP)))\n\treturn -ENETDOWN;\nif (unlikely(!xs-\u003etx))\n\treturn -ENOBUFS;\n\nAs it can be observed above, in sendmsg() napi id can be marked on\ninterface that was not brought up and this causes a NULL ptr\ndereference:\n\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\n[31757.512710] #PF: supervisor read access in kernel mode\n[31757.517936] #PF: error_code(0x0000) - not-present page\n[31757.523149] PGD 0 P4D 0\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\n[31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 \u003c8b\u003e 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\n[31757.612364] FS:  00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\n[31757.620571] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[31757.648139] PKRU: 55555554\n[31757.650894] Call Trace:\n[31757.653385]  \u003cTASK\u003e\n[31757.655524]  sock_sendmsg+0x8f/0xa0\n[31757.659077]  ? sockfd_lookup_light+0x12/0x70\n[31757.663416]  __sys_sendto+0xfc/0x170\n[31757.667051]  ? do_sched_setscheduler+0xdb/0x1b0\n[31757.671658]  __x64_sys_sendto+0x20/0x30\n[31757.675557]  do_syscall_64+0x38/0x90\n[31757.679197]  entry_SYSCALL_64_after_hwframe+0x72/0xdc\n[31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n[31757.754940]  \u003c/TASK\u003e\n\nTo fix this, let\u0027s make xsk_xmit a function that will be responsible for\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\nand xs-\u003ezc handling. Populate sanity checks to __xsk_sendmsg() and\nxsk_poll()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:28:23.218Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b"
        }
      ],
      "title": "xsk: check IFF_UP earlier in Tx path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53240",
    "datePublished": "2025-09-15T14:22:14.241Z",
    "dateReserved": "2025-09-15T14:19:21.848Z",
    "dateUpdated": "2026-05-23T15:28:23.218Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53240",
      "date": "2026-08-03",
      "epss": "0.00143",
      "percentile": "0.04107"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:10:35.000Z",
      "cve": "CVE-2023-53240",
      "id": "msrc_CVE-2023-53240",
      "initial_release_date": "2025-09-02T00:00:00.000Z",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "xsk: check IFF_UP earlier in Tx path",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2023-53240.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53240\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:51.120\",\"lastModified\":\"2026-06-17T06:44:36.210\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: check IFF_UP earlier in Tx path\\n\\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\\ntwo paths share a call to common function xsk_xmit() which has two\\nsanity checks within. A pseudo code example to show the two paths:\\n\\n__xsk_sendmsg() :                       xsk_poll():\\nif (unlikely(!xsk_is_bound(xs)))        if (unlikely(!xsk_is_bound(xs)))\\n    return -ENXIO;                          return mask;\\nif (unlikely(need_wait))                (...)\\n    return -EOPNOTSUPP;                 xsk_xmit()\\nmark napi id\\n(...)\\nxsk_xmit()\\n\\nxsk_xmit():\\nif (unlikely(!(xs-\u003edev-\u003eflags \u0026 IFF_UP)))\\n\\treturn -ENETDOWN;\\nif (unlikely(!xs-\u003etx))\\n\\treturn -ENOBUFS;\\n\\nAs it can be observed above, in sendmsg() napi id can be marked on\\ninterface that was not brought up and this causes a NULL ptr\\ndereference:\\n\\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\\n[31757.512710] #PF: supervisor read access in kernel mode\\n[31757.517936] #PF: error_code(0x0000) - not-present page\\n[31757.523149] PGD 0 P4D 0\\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\\n[31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 \u003c8b\u003e 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\\n[31757.612364] FS:  00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\\n[31757.620571] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n[31757.648139] PKRU: 55555554\\n[31757.650894] Call Trace:\\n[31757.653385]  \u003cTASK\u003e\\n[31757.655524]  sock_sendmsg+0x8f/0xa0\\n[31757.659077]  ? sockfd_lookup_light+0x12/0x70\\n[31757.663416]  __sys_sendto+0xfc/0x170\\n[31757.667051]  ? do_sched_setscheduler+0xdb/0x1b0\\n[31757.671658]  __x64_sys_sendto+0x20/0x30\\n[31757.675557]  do_syscall_64+0x38/0x90\\n[31757.679197]  entry_SYSCALL_64_after_hwframe+0x72/0xdc\\n[31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\\n[31757.754940]  \u003c/TASK\u003e\\n\\nTo fix this, let\u0027s make xsk_xmit a function that will be responsible for\\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\\nand xs-\u003ezc handling. Populate sanity checks to __xsk_sendmsg() and\\nxsk_poll().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xdp/xsk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\",\"lessThan\":\"cecc68559cd57fffb2be50685f262b9af2318e16\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\",\"lessThan\":\"ffe19750e68d0bb21e8110b398346eef20b156a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\",\"lessThan\":\"1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad7219cd8751bd258b9d1e69ae0654ec00f71875\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d1579253ffce39986e7a6ab757ac93b2680a665f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.33\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.16.19\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.17.2\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xdp/xsk.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.16\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.3\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-14T17:57:36.337425Z\",\"id\":\"CVE-2023-53240\",\"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-476\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.33\",\"versionEndExcluding\":\"5.16\",\"matchCriteriaId\":\"38E7A7B3-C56B-4D09-A3BC-1A47B10759B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.19\",\"versionEndExcluding\":\"5.17\",\"matchCriteriaId\":\"D4ED89FC-18EE-445F-8FE2-A2B6A5F9BB13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17.2\",\"versionEndExcluding\":\"6.1.16\",\"matchCriteriaId\":\"AD68A6E9-F664-4594-B8A0-ED32253D6067\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.2.3\",\"matchCriteriaId\":\"88C67289-22AD-4CA9-B202-5F5A80E5BA4B\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T22:14:09+00:00",
      "cve": "CVE-2023-53240",
      "id": "CVE-2023-53240",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "201",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xsk: check IFF_UP earlier in Tx path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53240.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-53240\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T17:57:36.337425Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T17:57:32.342Z\"}}], \"cna\": {\"title\": \"xsk: check IFF_UP earlier in Tx path\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\", \"lessThan\": \"cecc68559cd57fffb2be50685f262b9af2318e16\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\", \"lessThan\": \"ffe19750e68d0bb21e8110b398346eef20b156a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18b1ab7aa76bde181bdb1ab19a87fa9523c32f21\", \"lessThan\": \"1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ad7219cd8751bd258b9d1e69ae0654ec00f71875\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d1579253ffce39986e7a6ab757ac93b2680a665f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9\", \"versionType\": \"git\"}], \"programFiles\": [\"net/xdp/xsk.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.16\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.2.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/xdp/xsk.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16\"}, {\"url\": \"https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7\"}, {\"url\": \"https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: check IFF_UP earlier in Tx path\\n\\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\\ntwo paths share a call to common function xsk_xmit() which has two\\nsanity checks within. A pseudo code example to show the two paths:\\n\\n__xsk_sendmsg() :                       xsk_poll():\\nif (unlikely(!xsk_is_bound(xs)))        if (unlikely(!xsk_is_bound(xs)))\\n    return -ENXIO;                          return mask;\\nif (unlikely(need_wait))                (...)\\n    return -EOPNOTSUPP;                 xsk_xmit()\\nmark napi id\\n(...)\\nxsk_xmit()\\n\\nxsk_xmit():\\nif (unlikely(!(xs-\u003edev-\u003eflags \u0026 IFF_UP)))\\n\\treturn -ENETDOWN;\\nif (unlikely(!xs-\u003etx))\\n\\treturn -ENOBUFS;\\n\\nAs it can be observed above, in sendmsg() napi id can be marked on\\ninterface that was not brought up and this causes a NULL ptr\\ndereference:\\n\\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\\n[31757.512710] #PF: supervisor read access in kernel mode\\n[31757.517936] #PF: error_code(0x0000) - not-present page\\n[31757.523149] PGD 0 P4D 0\\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\\n[31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 \u003c8b\u003e 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\\n[31757.612364] FS:  00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\\n[31757.620571] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n[31757.648139] PKRU: 55555554\\n[31757.650894] Call Trace:\\n[31757.653385]  \u003cTASK\u003e\\n[31757.655524]  sock_sendmsg+0x8f/0xa0\\n[31757.659077]  ? sockfd_lookup_light+0x12/0x70\\n[31757.663416]  __sys_sendto+0xfc/0x170\\n[31757.667051]  ? do_sched_setscheduler+0xdb/0x1b0\\n[31757.671658]  __x64_sys_sendto+0x20/0x30\\n[31757.675557]  do_syscall_64+0x38/0x90\\n[31757.679197]  entry_SYSCALL_64_after_hwframe+0x72/0xdc\\n[31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\\n[31757.754940]  \u003c/TASK\u003e\\n\\nTo fix this, let\u0027s make xsk_xmit a function that will be responsible for\\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\\nand xs-\u003ezc handling. Populate sanity checks to __xsk_sendmsg() and\\nxsk_poll().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.16\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2.3\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.33\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.16.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.17.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-15T14:22:14.241Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53240\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T18:02:50.570Z\", \"dateReserved\": \"2025-09-15T14:19:21.848Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-15T14:22:14.241Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.