{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64352", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.782Z", "datePublished": "2026-07-25T08:50:11.522Z", "dateUpdated": "2026-08-17T04:53:57.862Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:53:57.862Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Allow LPM map access from sleepable BPF programs\n\ntrie_lookup_elem() annotates its rcu_dereference_check() walks with\nonly rcu_read_lock_bh_held(). Because rcu_dereference_check(p, c)\nresolves to \"c || rcu_read_lock_held()\", this passes for XDP/NAPI and\nclassic RCU readers but fails for sleepable BPF programs, which enter\nvia __bpf_prog_enter_sleepable() and hold only rcu_read_lock_trace().\n\ntrie_update_elem() and trie_delete_elem() have the same problem in a\ndifferent form: they walk the trie with plain rcu_dereference(), which\nasserts rcu_read_lock_held() unconditionally. Both are reachable from\nsleepable BPF programs via the bpf_map_update_elem / bpf_map_delete_elem\nhelpers, and from the syscall path under classic rcu_read_lock(). In\nthe writer paths the trie is actually protected by trie->lock (an\nrqspinlock taken across the walk); we never relied on the RCU read-side\nlock to keep nodes alive there.\n\nA sleepable LSM hook that ends up touching an LPM trie therefore\ntriggers lockdep on debug kernels:\n\n =============================\n WARNING: suspicious RCU usage\n 7.1.0-... Tainted: G E\n -----------------------------\n kernel/bpf/lpm_trie.c:249 suspicious rcu_dereference_check() usage!\n 1 lock held by net_tests/540:\n #0: (rcu_tasks_trace_srcu_struct){....}-{0:0},\n at: __bpf_prog_enter_sleepable+0x26/0x280\n Call Trace:\n dump_stack_lvl\n lockdep_rcu_suspicious\n trie_lookup_elem\n bpf_prog_..._enforce_security_socket_connect\n bpf_trampoline_...\n security_socket_connect\n __sys_connect\n do_syscall_64\n\nThis is lockdep-only -- no UAF, since Tasks Trace RCU does serialize\nagainst the trie's reclaim path -- but it spams the console once per\ndistinct callsite on every debug kernel running a sleepable BPF LSM\nthat touches an LPM trie, which is increasingly common.\n\nFor the lookup path, switch the rcu_dereference_check() annotation\nfrom rcu_read_lock_bh_held() to bpf_rcu_lock_held(), which accepts all\nthree contexts (classic, BH, Tasks Trace). Other map types already\nfollow this convention.\n\nFor trie_update_elem() and trie_delete_elem(), annotate the walks as\nrcu_dereference_protected(*p, 1) -- matching trie_free() in the same\nfile -- since trie->lock is held across the walk. rqspinlock has no\nlockdep_map, so the predicate degenerates to '1' rather than\nlockdep_is_held(&trie->lock); the protection is real but not\nmachine-verifiable. trie_get_next_key() also uses bare\nrcu_dereference() but is reachable only from the BPF syscall, which\nholds classic rcu_read_lock() before dispatching, so it is left\nuntouched." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/lpm_trie.c" ], "versions": [ { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "f0967d4f1ba4323a3cb7dc8fdba74dd3a8caaf04", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "304ca50582f0c047370f85e13caec456f78c9fcc", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "ec662a8b2cde01e76b37ccd4b992d0342299e69c", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "9bfdf4b81b0e56d47bc6c46c34a46638be716695", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "57454944737f3ad9a8703aecbbb79713b513a94b", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "bd6ad9a6b30498d845413e863fb95c6fab3babe3", "status": "affected", "versionType": "git" }, { "version": "694cea395fded425008e93cd90cfdf7a451674af", "lessThan": "2f884d371fafea137afea504d49ee4a7c8d7985b", "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/lpm_trie.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f0967d4f1ba4323a3cb7dc8fdba74dd3a8caaf04" }, { "url": "https://git.kernel.org/stable/c/304ca50582f0c047370f85e13caec456f78c9fcc" }, { "url": "https://git.kernel.org/stable/c/ec662a8b2cde01e76b37ccd4b992d0342299e69c" }, { "url": "https://git.kernel.org/stable/c/9bfdf4b81b0e56d47bc6c46c34a46638be716695" }, { "url": "https://git.kernel.org/stable/c/57454944737f3ad9a8703aecbbb79713b513a94b" }, { "url": "https://git.kernel.org/stable/c/bd6ad9a6b30498d845413e863fb95c6fab3babe3" }, { "url": "https://git.kernel.org/stable/c/2f884d371fafea137afea504d49ee4a7c8d7985b" } ], "title": "bpf: Allow LPM map access from sleepable BPF programs", "x_generator": { "engine": "bippy-1.2.0" } } } }