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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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          "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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              "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."
            }
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        "dateUpdated": "2026-08-23T12:46:50.580Z",
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    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-23T12:46:50.580Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/fork.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"7df67a4799067a59e6a2d53f8059a6be6e73e678\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"aff686efd38728e06daf12417a0d7ed454ce4cff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"9cff220ddb65b022cc668bb652200742476e744c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"c4f626ddf2350652ad2f79daf1f10847f3f6eabd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"43f0005f81b8ce3be962d653cde8db9022f1e9b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a10787e6d58c24b51e91c19c6d16c5da89fcaa4b\",\"lessThan\":\"9b51a6155d14389876916726430da30eabb1d4ed\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/fork.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"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\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/43f0005f81b8ce3be962d653cde8db9022f1e9b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7df67a4799067a59e6a2d53f8059a6be6e73e678\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9cff220ddb65b022cc668bb652200742476e744c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aff686efd38728e06daf12417a0d7ed454ce4cff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4f626ddf2350652ad2f79daf1f10847f3f6eabd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:21:59+00:00",
      "cve": "CVE-2026-72110",
      "id": "CVE-2026-72110",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf,fork: wipe -\u003ebpf_storage before bailouts that access it",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72110.json",
      "version": "3"
    }
  }
}



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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.