CVE-2026-74717 (GCVE-0-2026-74717)
Vulnerability from cvelistv5
Published
2026-08-22 15:33
Modified
2026-08-25 05:41
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: fw_tracer, return NULL on create error Tracer creation can fail by returning either NULL or ERR_PTR. The return value is stored without a check on the device, and users treat ERR_PTR and NULL the same way. This also causes a crash in the core dump logic, which is missing the ERR_PTR check and ends up dereferencing it, as shown in the trace below. Switch tracer creation to return NULL on failure only, so callers only need a single NULL check. Internal error: Oops: 0000000096000006 [#1] SMP Modules linked in: mlx5_ib ib_uverbs ib_core ipv6 mlx5_core CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.19.7 #1 PREEMPT(none) Workqueue: mlx5_health0001:01:00.0 mlx5_fw_reporter_err_work [mlx5_core] pstate: a3400009 (NzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core] lr : mlx5_fw_tracer_trigger_core_dump_general+0x40/0xe0 [mlx5_core] sp : ffff800081cf3c40 x29: ffff800081cf3c90 x28: 0000000000000000 x27: 0000000000000000 x26: ffff000080018828 x25: 0000000000000000 x24: ffff000080304a05 x23: ffff800081cf3d80 x22: ffff0000847e01a0 x21: 0000000000000000 x20: ffff0000847e01a0 x19: ffffffffffffffa1 x18: ffff80008310bbf0 x17: ffff800080119650 x16: ffff80008010df54 x15: ffff80008010d4ac x14: ffff800079c202e4 x13: ffff80008002fe60 x12: ffff800080119650 x11: ffff80008010df54 x10: ffff80008010d4ac x9 : ffff800079c203d8 x8 : ffff800081cf3c88 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000008 x3 : 0000000000000030 x2 : 0000000000000008 x1 : 0000000000000000 x0 : 00000000c5c4000e Call trace: mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core] (P) mlx5_fw_reporter_dump+0x30/0x2e0 [mlx5_core] devlink_health_do_dump+0x9c/0x160 devlink_health_report+0x1c0/0x288 mlx5_fw_reporter_err_work+0xac/0xc0 [mlx5_core] process_one_work+0x15c/0x3d8 worker_thread+0x18c/0x320 kthread+0x148/0x228 ret_from_fork+0x10/0x20 Code: b9400000 5ac00800 7a401800 540003ca (3940a260) ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Oops: Fatal exception SMP: stopping secondary CPUs Kernel Offset: disabled CPU features: 0x000000,00078031,75fce5a1,35fffe67 Memory Limit: none ---[ end Kernel panic - not syncing: Oops: Fatal exception ]---
References
Impacted products
Vendor Product Version
Linux Linux Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
Version: fd1483fe1f9fd45fe312adffb0faffa57446690d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "47fe0d2571e5b446a0f0b0c1d6b99f55e51f5cc0",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            },
            {
              "lessThan": "ee41ea49c4ab0e4015919f52ad23ec251d3b39d3",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            },
            {
              "lessThan": "04599570c3a18f9ae7aad36825eb46f3dcd2c4e3",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            },
            {
              "lessThan": "9a416f000285a94c1b723877547981dec8132434",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "b1d6375b9a63c9dc7e5e780d3ea9b126fe30d6cb",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "80094352bd40ba54a33731f9c22872493983ed6d",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            },
            {
              "lessThan": "4aafa600d93e9551c1f24e785d57cbd4adf021d5",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            },
            {
              "lessThan": "af39eb111ce6b5eba9c08513b62c4868eb7e7fd5",
              "status": "affected",
              "version": "fd1483fe1f9fd45fe312adffb0faffa57446690d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: fw_tracer, return NULL on create error\n\nTracer creation can fail by returning either NULL or ERR_PTR.\nThe return value is stored without a check on the device, and users\ntreat ERR_PTR and NULL the same way.\nThis also causes a crash in the core dump logic, which is missing the\nERR_PTR check and ends up dereferencing it, as shown in the trace below.\n\nSwitch tracer creation to return NULL on failure only, so callers only\nneed a single NULL check.\n\n  Internal error: Oops: 0000000096000006 [#1]  SMP\n  Modules linked in: mlx5_ib ib_uverbs ib_core ipv6 mlx5_core\n  CPU: 1 UID: 0 PID: 12 Comm: kworker/u16:0 Not tainted 6.19.7 #1 PREEMPT(none)\n  Workqueue: mlx5_health0001:01:00.0 mlx5_fw_reporter_err_work [mlx5_core]\n  pstate: a3400009 (NzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)\n  pc : mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core]\n  lr : mlx5_fw_tracer_trigger_core_dump_general+0x40/0xe0 [mlx5_core]\n  sp : ffff800081cf3c40\n  x29: ffff800081cf3c90 x28: 0000000000000000 x27: 0000000000000000\n  x26: ffff000080018828 x25: 0000000000000000 x24: ffff000080304a05\n  x23: ffff800081cf3d80 x22: ffff0000847e01a0 x21: 0000000000000000\n  x20: ffff0000847e01a0 x19: ffffffffffffffa1 x18: ffff80008310bbf0\n  x17: ffff800080119650 x16: ffff80008010df54 x15: ffff80008010d4ac\n  x14: ffff800079c202e4 x13: ffff80008002fe60 x12: ffff800080119650\n  x11: ffff80008010df54 x10: ffff80008010d4ac x9 : ffff800079c203d8\n  x8 : ffff800081cf3c88 x7 : 0000000000000000 x6 : 0000000000000000\n  x5 : 0000000000000000 x4 : 0000000000000008 x3 : 0000000000000030\n  x2 : 0000000000000008 x1 : 0000000000000000 x0 : 00000000c5c4000e\n  Call trace:\n   mlx5_fw_tracer_trigger_core_dump_general+0x58/0xe0 [mlx5_core] (P)\n   mlx5_fw_reporter_dump+0x30/0x2e0 [mlx5_core]\n   devlink_health_do_dump+0x9c/0x160\n   devlink_health_report+0x1c0/0x288\n   mlx5_fw_reporter_err_work+0xac/0xc0 [mlx5_core]\n   process_one_work+0x15c/0x3d8\n   worker_thread+0x18c/0x320\n   kthread+0x148/0x228\n   ret_from_fork+0x10/0x20\n  Code: b9400000 5ac00800 7a401800 540003ca (3940a260)\n  ---[ end trace 0000000000000000 ]---\n  Kernel panic - not syncing: Oops: Fatal exception\n  SMP: stopping secondary CPUs\n  Kernel Offset: disabled\n  CPU features: 0x000000,00078031,75fce5a1,35fffe67\n  Memory Limit: none\n  ---[ end Kernel panic - not syncing: Oops: Fatal exception ]---"
        }
      ],
      "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 - On internet-facing cloud/HPC hosts with mlx5 PF NICs, a remote attacker can induce ConnectX firmware syndrome via crafted network/RDMA traffic; the kernel health poller then auto-invokes mlx5_fw_reporter_dump without any local syscall.\nAC:L - On affected hardware, mlx5_fw_tracer_create leaves ERR_PTR in dev-\u003etracer at probe (e.g. -EOPNOTSUPP when trace_to_memory is unset); once present, any FW syndrome or health miss counter event reliably queues the dump workqueue that dereferences the bad pointer.\nPR:N - The crash path shown in the fix oops is triggered automatically by mlx5_fw_reporter_err_work from the health poller with no userspace action; inducing FW syndrome over the network requires no host credentials, unlike the optional devlink dump path that needs CAP_NET_ADMIN.\nUI:N - Exploitation requires no victim interaction; the devlink health auto_dump fires from kernel workqueues when firmware reports a syndrome or miss-count threshold, independent of user actions such as mounts or file opens.\nS:U - Impact is confined to kernel crash/panic on the host running mlx5_core; there is no VM escape, IOMMU bypass, or crossing from guest VF context into a separate security authority beyond standard host kernel failure.\nC:N - The bug is an ERR_PTR mishandled as a valid mlx5_fw_tracer pointer; mlx5_fw_tracer_trigger_core_dump_general dereferences tracer-\u003eowner and faults immediately, producing an oops with no out-of-bounds read, UAF, or information disclosure primitive.\nI:N - Faulting on an ERR_PTR-encoded address does not corrupt adjacent memory or provide a controllable write primitive; the only outcome is an unrecoverable kernel oops/panic, not arbitrary modification or code execution.\nA:H - The fix commit documents a fatal kernel Oops in mlx5_fw_tracer_trigger_core_dump_general followed by \u0027Kernel panic - not syncing\u0027, causing complete loss of host availability on affected mlx5 PF systems when the FW reporter dump path runs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:59.788Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/47fe0d2571e5b446a0f0b0c1d6b99f55e51f5cc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee41ea49c4ab0e4015919f52ad23ec251d3b39d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/04599570c3a18f9ae7aad36825eb46f3dcd2c4e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a416f000285a94c1b723877547981dec8132434"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1d6375b9a63c9dc7e5e780d3ea9b126fe30d6cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/80094352bd40ba54a33731f9c22872493983ed6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/4aafa600d93e9551c1f24e785d57cbd4adf021d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/af39eb111ce6b5eba9c08513b62c4868eb7e7fd5"
        }
      ],
      "title": "net/mlx5: fw_tracer, return NULL on create error",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74717",
    "datePublished": "2026-08-22T15:33:11.488Z",
    "dateReserved": "2026-08-15T05:44:03.928Z",
    "dateUpdated": "2026-08-25T05:41:59.788Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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