CVE-2026-53096bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 4a3d0fe30b907ff324b1b49756f7e713d67f3645; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before b089aa6e94d7a08e74d076a0fe274842dc9feccc; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 571a05ea1baaccc0dc1e0d227b2cbc978b96d392; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before d4c4bd231ebad70e6f30db429e9640bf378b2f52; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 7027e705062482a8cea43a1c13ede3c35653966f; from e624d4ed4aa8cc3c69d1359b0aaea539203ed266 before 8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.14 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10 | NVD |
References
- https://git.kernel.org/stable/c/4a3d0fe30b907ff324b1b49756f7e713d67f3645patch
- https://git.kernel.org/stable/c/b089aa6e94d7a08e74d076a0fe274842dc9fecccpatch
- https://git.kernel.org/stable/c/571a05ea1baaccc0dc1e0d227b2cbc978b96d392patch
- https://git.kernel.org/stable/c/cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901apatch
- https://git.kernel.org/stable/c/d4c4bd231ebad70e6f30db429e9640bf378b2f52patch
- https://git.kernel.org/stable/c/7027e705062482a8cea43a1c13ede3c35653966fpatch
- https://git.kernel.org/stable/c/8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.