CVE-2026-53096 (GCVE-0-2026-53096)
Vulnerability from cvelistv5
Published
2026-06-24 16:30
Modified
2026-08-05 12:33
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path The DEVMAP_HASH branch in dev_map_redirect_multi() uses hlist_for_each_entry_safe() to iterate hash buckets, but this function runs under RCU protection (called from xdp_do_generic_redirect_map() in softirq context). Concurrent writers (__dev_map_hash_update_elem, dev_map_hash_delete_elem) modify the list using RCU primitives (hlist_add_head_rcu, hlist_del_rcu). hlist_for_each_entry_safe() performs plain pointer dereferences without rcu_dereference(), missing the acquire barrier needed to pair with writers' rcu_assign_pointer(). On weakly-ordered architectures (ARM64, POWER), a reader can observe a partially-constructed node. It also defeats CONFIG_PROVE_RCU lockdep validation and KCSAN data-race detection. Replace with hlist_for_each_entry_rcu() using rcu_read_lock_bh_held() as the lockdep condition, consistent with the rcu_dereference_check() used in the DEVMAP (non-hash) branch of the same functions. Also fix the same incorrect lockdep_is_held(&dtab->index_lock) condition in dev_map_enqueue_multi(), where the lock is not held either.
References
Impacted products
Vendor Product Version
Linux Linux Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
Version: e624d4ed4aa8cc3c69d1359b0aaea539203ed266
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/devmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
          "programFiles": [
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              "version": "6.12.91",
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              "status": "unaffected",
              "version": "6.18.33",
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            },
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
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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: Use RCU-safe iteration in dev_map_redirect_multi() SKB path\n\nThe DEVMAP_HASH branch in dev_map_redirect_multi() uses\nhlist_for_each_entry_safe() to iterate hash buckets, but this function\nruns under RCU protection (called from xdp_do_generic_redirect_map()\nin softirq context). Concurrent writers (__dev_map_hash_update_elem,\ndev_map_hash_delete_elem) modify the list using RCU primitives\n(hlist_add_head_rcu, hlist_del_rcu).\n\nhlist_for_each_entry_safe() performs plain pointer dereferences without\nrcu_dereference(), missing the acquire barrier needed to pair with\nwriters\u0027 rcu_assign_pointer(). On weakly-ordered architectures (ARM64,\nPOWER), a reader can observe a partially-constructed node. It also\ndefeats CONFIG_PROVE_RCU lockdep validation and KCSAN data-race\ndetection.\n\nReplace with hlist_for_each_entry_rcu() using rcu_read_lock_bh_held()\nas the lockdep condition, consistent with the rcu_dereference_check()\nused in the DEVMAP (non-hash) branch of the same functions. Also fix\nthe same incorrect lockdep_is_held(\u0026dtab-\u003eindex_lock) condition in\ndev_map_enqueue_multi(), where the lock is not held either."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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 vulnerable path requires local BPF/netlink setup of an XDP program using a DEVMAP_HASH broadcast redirect and concurrent map update/delete operations. Network packets can trigger the packet-side reader after setup, but the exploit control path is local.\nAC:L - The attacker can control both sides of the race by driving packets through the attached XDP program while another local thread updates or deletes devmap-hash entries. Weakly ordered architectures such as ARM64/POWER are common reasonable deployments, so this is not a rare external condition.\nPR:L - The path requires BPF/CAP_NET_ADMIN-style privileges to create/update the map and load/attach XDP, but these can be available to a low-privileged local attacker through namespace/delegated BPF-token scenarios. It is not reachable by an unauthenticated remote attacker.\nUI:N - No victim action is needed once the attacker has the local privileges and can run the racing BPF/map operations. Packet delivery and map syscalls are attacker-driven.\nS:U - The impact remains within the kernel and the network namespace/security authority being attacked. This is standard kernel memory-safety exposure, not a VM escape or separate-scope boundary bypass.\nC:H - The unsafe non-RCU traversal can observe partially constructed or inconsistent bpf_dtab_netdev objects and dereference attacker-influenced stale kernel pointers. Given the kernel pointer misuse and heap-shaping potential, high confidentiality impact is defensible.\nI:H - The same stale or partially initialized dev/xdp_prog pointers can be used in redirect and BPF program execution paths, making control-flow or object-confusion style corruption plausible. Under the required overestimate rule, this supports high integrity impact.\nA:H - At minimum, dereferencing inconsistent devmap entries can crash or oops the kernel in the packet redirect path. The race is repeatable by the local attacker, so availability impact is high."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:21.982Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4a3d0fe30b907ff324b1b49756f7e713d67f3645"
        },
        {
          "url": "https://git.kernel.org/stable/c/b089aa6e94d7a08e74d076a0fe274842dc9feccc"
        },
        {
          "url": "https://git.kernel.org/stable/c/571a05ea1baaccc0dc1e0d227b2cbc978b96d392"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4c4bd231ebad70e6f30db429e9640bf378b2f52"
        },
        {
          "url": "https://git.kernel.org/stable/c/7027e705062482a8cea43a1c13ede3c35653966f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19"
        }
      ],
      "title": "bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53096",
    "datePublished": "2026-06-24T16:30:34.477Z",
    "dateReserved": "2026-06-09T07:44:35.384Z",
    "dateUpdated": "2026-08-05T12:33:21.982Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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