CVE-2026-53096 (GCVE-0-2026-53096)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-08-05 12:33
VLAI
Title
bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path
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.
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
Linux Linux Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 4a3d0fe30b907ff324b1b49756f7e713d67f3645 (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < b089aa6e94d7a08e74d076a0fe274842dc9feccc (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 571a05ea1baaccc0dc1e0d227b2cbc978b96d392 (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < d4c4bd231ebad70e6f30db429e9640bf378b2f52 (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 7027e705062482a8cea43a1c13ede3c35653966f (git)
Affected: e624d4ed4aa8cc3c69d1359b0aaea539203ed266 , < 8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "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."
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:36:16+00:00",
      "cve": "CVE-2026-53096",
      "id": "CVE-2026-53096",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53096.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-03T03:05:18Z",
      "cve": "CVE-2026-53096",
      "id": "CVE-2026-53096",
      "initial_release_date": "2026-07-03T03:05:18Z",
      "product_status:known_affected": "200",
      "product_status:known_not_affected": "91",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53096",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53096.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.