{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53096", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.384Z", "datePublished": "2026-06-24T16:30:34.477Z", "dateUpdated": "2026-08-05T12:33:21.982Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:21.982Z" }, "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' 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(&dtab->index_lock) condition in\ndev_map_enqueue_multi(), where the lock is not held either." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/devmap.c" ], "versions": [ { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "4a3d0fe30b907ff324b1b49756f7e713d67f3645", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "b089aa6e94d7a08e74d076a0fe274842dc9feccc", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "571a05ea1baaccc0dc1e0d227b2cbc978b96d392", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "d4c4bd231ebad70e6f30db429e9640bf378b2f52", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "7027e705062482a8cea43a1c13ede3c35653966f", "status": "affected", "versionType": "git" }, { "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266", "lessThan": "8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/devmap.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.1" } ] } ] } ], "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" } } } }