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CVE-2026-74335 (GCVE-0-2026-74335)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
bpf: Fix NULL pointer dereference in bpf_task_from_vpid()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix NULL pointer dereference in bpf_task_from_vpid() bpf_task_from_vpid() looks up a task in the pid namespace of the current task, via find_task_by_vpid(): find_task_by_vpid(vpid) find_task_by_pid_ns(vpid, task_active_pid_ns(current)) find_pid_ns(nr, ns) -> idr_find(&ns->idr, nr) cgroup_skb programs run in softirq, which may interrupt a task that is itself in do_exit(). Once that task has passed exit_notify() -> release_task() -> __unhash_process(), its thread_pid is cleared, so task_active_pid_ns(current) returns NULL and find_pid_ns() dereferences &NULL->idr: BUG: kernel NULL pointer dereference, address: 0000000000000050 RIP: 0010:idr_find+0x11/0x30 lib/idr.c:176 Call Trace: <IRQ> find_pid_ns kernel/pid.c:370 [inline] find_task_by_pid_ns+0x3b/0xe0 kernel/pid.c:485 bpf_task_from_vpid+0x5b/0x200 kernel/bpf/helpers.c:2916 bpf_prog_run_array_cg+0x17e/0x530 kernel/bpf/cgroup.c:81 __cgroup_bpf_run_filter_skb+0x12b/0x250 kernel/bpf/cgroup.c:1612 sk_filter_trim_cap+0x1dc/0x4c0 net/core/filter.c:148 tcp_v4_rcv+0x18d1/0x2200 net/ipv4/tcp_ipv4.c:2223 </IRQ> <TASK> do_exit+0xa63/0x1270 kernel/exit.c:1010 get_signal+0x141c/0x1530 kernel/signal.c:3037 Bail out when current has no pid namespace.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 675c3596ff32c040d1dd2e28dd57e83e634b9f60 , < b7474f4432dd9559ada03b01a8cd3472cd02c61d (git)
Affected: 675c3596ff32c040d1dd2e28dd57e83e634b9f60 , < a4c95b6221cb2972a94ed72663c09bd5b0b6dea4 (git)
Affected: 675c3596ff32c040d1dd2e28dd57e83e634b9f60 , < 50dff00615522f3ec03449680ca23beb4cfc549c (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL pointer dereference in bpf_task_from_vpid()\n\nbpf_task_from_vpid() looks up a task in the pid namespace of the\ncurrent task, via find_task_by_vpid():\n\n  find_task_by_vpid(vpid)\n    find_task_by_pid_ns(vpid, task_active_pid_ns(current))\n      find_pid_ns(nr, ns) -\u003e idr_find(\u0026ns-\u003eidr, nr)\n\ncgroup_skb programs run in softirq, which may interrupt a task that is\nitself in do_exit(). Once that task has passed\nexit_notify() -\u003e release_task() -\u003e __unhash_process(), its thread_pid is\ncleared, so task_active_pid_ns(current) returns NULL and find_pid_ns()\ndereferences \u0026NULL-\u003eidr:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000050\n  RIP: 0010:idr_find+0x11/0x30 lib/idr.c:176\n  Call Trace:\n   \u003cIRQ\u003e\n   find_pid_ns kernel/pid.c:370 [inline]\n   find_task_by_pid_ns+0x3b/0xe0 kernel/pid.c:485\n   bpf_task_from_vpid+0x5b/0x200 kernel/bpf/helpers.c:2916\n   bpf_prog_run_array_cg+0x17e/0x530 kernel/bpf/cgroup.c:81\n   __cgroup_bpf_run_filter_skb+0x12b/0x250 kernel/bpf/cgroup.c:1612\n   sk_filter_trim_cap+0x1dc/0x4c0 net/core/filter.c:148\n   tcp_v4_rcv+0x18d1/0x2200 net/ipv4/tcp_ipv4.c:2223\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   do_exit+0xa63/0x1270 kernel/exit.c:1010\n   get_signal+0x141c/0x1530 kernel/signal.c:3037\n\nBail out when current has no pid namespace."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:17:26.885Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b7474f4432dd9559ada03b01a8cd3472cd02c61d"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4c95b6221cb2972a94ed72663c09bd5b0b6dea4"
        },
        {
          "url": "https://git.kernel.org/stable/c/50dff00615522f3ec03449680ca23beb4cfc549c"
        }
      ],
      "title": "bpf: Fix NULL pointer dereference in bpf_task_from_vpid()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74335",
    "datePublished": "2026-08-15T05:58:27.148Z",
    "dateReserved": "2026-08-15T05:44:03.885Z",
    "dateUpdated": "2026-08-17T05:17:26.885Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74335",
      "date": "2026-09-04",
      "epss": "0.00166",
      "percentile": "0.06114"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74335\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:34.393\",\"lastModified\":\"2026-08-17T06:19:27.990\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix NULL pointer dereference in bpf_task_from_vpid()\\n\\nbpf_task_from_vpid() looks up a task in the pid namespace of the\\ncurrent task, via find_task_by_vpid():\\n\\n  find_task_by_vpid(vpid)\\n    find_task_by_pid_ns(vpid, task_active_pid_ns(current))\\n      find_pid_ns(nr, ns) -\u003e idr_find(\u0026ns-\u003eidr, nr)\\n\\ncgroup_skb programs run in softirq, which may interrupt a task that is\\nitself in do_exit(). Once that task has passed\\nexit_notify() -\u003e release_task() -\u003e __unhash_process(), its thread_pid is\\ncleared, so task_active_pid_ns(current) returns NULL and find_pid_ns()\\ndereferences \u0026NULL-\u003eidr:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000050\\n  RIP: 0010:idr_find+0x11/0x30 lib/idr.c:176\\n  Call Trace:\\n   \u003cIRQ\u003e\\n   find_pid_ns kernel/pid.c:370 [inline]\\n   find_task_by_pid_ns+0x3b/0xe0 kernel/pid.c:485\\n   bpf_task_from_vpid+0x5b/0x200 kernel/bpf/helpers.c:2916\\n   bpf_prog_run_array_cg+0x17e/0x530 kernel/bpf/cgroup.c:81\\n   __cgroup_bpf_run_filter_skb+0x12b/0x250 kernel/bpf/cgroup.c:1612\\n   sk_filter_trim_cap+0x1dc/0x4c0 net/core/filter.c:148\\n   tcp_v4_rcv+0x18d1/0x2200 net/ipv4/tcp_ipv4.c:2223\\n   \u003c/IRQ\u003e\\n   \u003cTASK\u003e\\n   do_exit+0xa63/0x1270 kernel/exit.c:1010\\n   get_signal+0x141c/0x1530 kernel/signal.c:3037\\n\\nBail out when current has no pid namespace.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/helpers.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"675c3596ff32c040d1dd2e28dd57e83e634b9f60\",\"lessThan\":\"b7474f4432dd9559ada03b01a8cd3472cd02c61d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"675c3596ff32c040d1dd2e28dd57e83e634b9f60\",\"lessThan\":\"a4c95b6221cb2972a94ed72663c09bd5b0b6dea4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"675c3596ff32c040d1dd2e28dd57e83e634b9f60\",\"lessThan\":\"50dff00615522f3ec03449680ca23beb4cfc549c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/helpers.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/50dff00615522f3ec03449680ca23beb4cfc549c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a4c95b6221cb2972a94ed72663c09bd5b0b6dea4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7474f4432dd9559ada03b01a8cd3472cd02c61d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T18:15:59+00:00",
      "cve": "CVE-2026-74335",
      "id": "CVE-2026-74335",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix NULL pointer dereference in bpf_task_from_vpid()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74335.json",
      "version": "3"
    }
  }
}



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  • 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.
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