Vulnerability-Lookup

GHSA-9WFF-G7FH-998R

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-23 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf,fork: wipe ->bpf_storage before bailouts that access it

Currently, copy_process() can bail out to free_task() before p->bpf_storage has been initialized, with this call graph (shown here for the !CONFIG_MEMCG case):

copy_process dup_task_struct arch_dup_task_struct [copies the entire task_struct, including ->bpf_storage member] [RLIMIT_NPROC check fails] delayed_free_task free_task bpf_task_storage_free rcu_dereference(task->bpf_storage) bpf_local_storage_destroy

In this case, the nascent task's ->bpf_storage member that bpf_local_storage_destroy() operates on is a plain copy of the parent's ->bpf_storage pointer, not a real initialized pointer. This leads to badness (kernel hangs, UAF).

This is reachable as long as the process calling fork() has been inserted into a task storage map.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72110"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:25Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,fork: wipe -\u003ebpf_storage before bailouts that access it\n\nCurrently, copy_process() can bail out to free_task() before p-\u003ebpf_storage\nhas been initialized, with this call graph (shown here for the\n!CONFIG_MEMCG case):\n\ncopy_process\n  dup_task_struct\n    arch_dup_task_struct\n      [copies the entire task_struct, including -\u003ebpf_storage member]\n  [RLIMIT_NPROC check fails]\n  delayed_free_task\n    free_task\n      bpf_task_storage_free\n        rcu_dereference(task-\u003ebpf_storage)\n        bpf_local_storage_destroy\n\nIn this case, the nascent task\u0027s -\u003ebpf_storage member that\nbpf_local_storage_destroy() operates on is a plain copy of the parent\u0027s\n-\u003ebpf_storage pointer, not a real initialized pointer.\nThis leads to badness (kernel hangs, UAF).\n\nThis is reachable as long as the process calling fork() has been inserted\ninto a task storage map.",
  "id": "GHSA-9wff-g7fh-998r",
  "modified": "2026-08-23T15:32:59Z",
  "published": "2026-08-15T06:32:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72110"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43f0005f81b8ce3be962d653cde8db9022f1e9b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7df67a4799067a59e6a2d53f8059a6be6e73e678"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cff220ddb65b022cc668bb652200742476e744c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aff686efd38728e06daf12417a0d7ed454ce4cff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4f626ddf2350652ad2f79daf1f10847f3f6eabd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72110 (GCVE-0-2026-72110)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46

Title

bpf,fork: wipe ->bpf_storage before bailouts that access it

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf,fork: wipe ->bpf_storage before bailouts that access it Currently, copy_process() can bail out to free_task() before p->bpf_storage has been initialized, with this call graph (shown here for the !CONFIG_MEMCG case): copy_process dup_task_struct arch_dup_task_struct [copies the entire task_struct, including ->bpf_storage member] [RLIMIT_NPROC check fails] delayed_free_task free_task bpf_task_storage_free rcu_dereference(task->bpf_storage) bpf_local_storage_destroy In this case, the nascent task's ->bpf_storage member that bpf_local_storage_destroy() operates on is a plain copy of the parent's ->bpf_storage pointer, not a real initialized pointer. This leads to badness (kernel hangs, UAF). This is reachable as long as the process calling fork() has been inserted into a task storage map.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/7df67a4799067a59e…
https://git.kernel.org/stable/c/aff686efd38728e06…
https://git.kernel.org/stable/c/c3fd6f28c7ce1142a…
https://git.kernel.org/stable/c/9cff220ddb65b022c…
https://git.kernel.org/stable/c/c4f626ddf2350652a…
https://git.kernel.org/stable/c/43f0005f81b8ce3be…
https://git.kernel.org/stable/c/9b51a6155d1438987…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < 7df67a4799067a59e6a2d53f8059a6be6e73e678 (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < aff686efd38728e06daf12417a0d7ed454ce4cff (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74 (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < 9cff220ddb65b022cc668bb652200742476e744c (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < c4f626ddf2350652ad2f79daf1f10847f3f6eabd (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < 43f0005f81b8ce3be962d653cde8db9022f1e9b0 (git) Affected: a10787e6d58c24b51e91c19c6d16c5da89fcaa4b , < 9b51a6155d14389876916726430da30eabb1d4ed (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.217 , ≤ 5.15.* (semver) Unaffected: 6.1.184 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/fork.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b",
              "versionType": "git"
            },
            {
              "lessThan": "aff686efd38728e06daf12417a0d7ed454ce4cff",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b",
              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.217",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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        {
          "nodes": [
            {
              "cpeMatch": [
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                  "versionEndExcluding": "5.15.217",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,fork: wipe -\u003ebpf_storage before bailouts that access it\n\nCurrently, copy_process() can bail out to free_task() before p-\u003ebpf_storage\nhas been initialized, with this call graph (shown here for the\n!CONFIG_MEMCG case):\n\ncopy_process\n  dup_task_struct\n    arch_dup_task_struct\n      [copies the entire task_struct, including -\u003ebpf_storage member]\n  [RLIMIT_NPROC check fails]\n  delayed_free_task\n    free_task\n      bpf_task_storage_free\n        rcu_dereference(task-\u003ebpf_storage)\n        bpf_local_storage_destroy\n\nIn this case, the nascent task\u0027s -\u003ebpf_storage member that\nbpf_local_storage_destroy() operates on is a plain copy of the parent\u0027s\n-\u003ebpf_storage pointer, not a real initialized pointer.\nThis leads to badness (kernel hangs, UAF).\n\nThis is reachable as long as the process calling fork() has been inserted\ninto a task storage map."
        }
      ],
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        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached via fork()/clone()/clone3() into copy_process() and free_task()-\u003ebpf_task_storage_free(); per kernel guidance BPF/fork paths are Local and no network-facing handler can drive this early-bailout teardown.\nAC:L - The attacker controls all conditions: dup_task_struct copies parent -\u003ebpf_storage, then they can deterministically force early copy_process failure (setrlimit(RLIMIT_NPROC) plus fork, fork-until-EAGAIN, or nr_threads exhaustion) to hit bpf_local_storage_destroy on the copied pointer.\nPR:L - Exploitation needs only a local process already inserted into a BPF task storage map (sched_ext/tracing BPF on servers, or BPF loaded via user-namespace CAP_BPF/unprivileged BPF); fork itself needs no real-root capability, so PR:L per user-namespace guidance.\nUI:N - No victim action is required; the attacker triggers the failed fork on a process they run and control the bailout timing themselves.\nS:U - Impact is in-kernel UAF/heap corruption and denial of service on the parent task\u0027s BPF local storage; this is standard kernel memory corruption without VM, container, or IOMMU boundary crossing.\nC:H - Destroying the parent\u0027s live bpf_local_storage via the child\u0027s stale -\u003ebpf_storage pointer is a use-after-free; freed bpf_local_storage/bpf_local_storage_elem objects can be reclaimed for arbitrary kernel memory disclosure per UAF guidance.\nI:H - bpf_local_storage_destroy() unlinks and frees parent storage still referenced by the live forking task, enabling heap grooming and attacker-controlled writes over freed BPF local storage structures for privilege escalation.\nA:H - The fix commit reports kernel hangs and UAF; tearing down active BPF task local storage during failed fork can oops, panic, or deadlock the system, satisfying High availability impact for kernel crashes/UAF."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:50.580Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed"
        }
      ],
      "title": "bpf,fork: wipe -\u003ebpf_storage before bailouts that access it",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72110",
    "datePublished": "2026-08-15T05:52:51.805Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-23T12:46:50.580Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-9WFF-G7FH-998R

CVE-2026-72110 (GCVE-0-2026-72110)

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Nomenclature