bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path
Summary
| CVE | CVE-2026-53096 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-06-24 17:17:23 UTC |
| Updated | 2026-06-24 17:17:23 UTC |
| Description | 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. |
Risk And Classification
EPSS: 0.001760000 probability, percentile 0.073050000 (date 2026-06-25)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 4a3d0fe30b907ff324b1b49756f7e713d67f3645 git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 b089aa6e94d7a08e74d076a0fe274842dc9feccc git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 571a05ea1baaccc0dc1e0d227b2cbc978b96d392 git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 d4c4bd231ebad70e6f30db429e9640bf378b2f52 git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 7027e705062482a8cea43a1c13ede3c35653966f git | Not specified |
| CNA | Linux | Linux | affected e624d4ed4aa8cc3c69d1359b0aaea539203ed266 8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19 git | Not specified |
| CNA | Linux | Linux | affected 5.14 | Not specified |
| CNA | Linux | Linux | unaffected 5.14 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.209 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.175 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.141 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.91 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.33 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.10 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/b089aa6e94d7a08e74d076a0fe274842dc9feccc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/571a05ea1baaccc0dc1e0d227b2cbc978b96d392 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d4c4bd231ebad70e6f30db429e9640bf378b2f52 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4a3d0fe30b907ff324b1b49756f7e713d67f3645 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7027e705062482a8cea43a1c13ede3c35653966f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.