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

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-28 06:39
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)
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    "dateReserved": "2026-06-09T07:44:35.384Z",
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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. 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  }
}


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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

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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.