{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"CRITICAL" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix slab-use-after-free Read in tipc_aead_decrypt_done\n\ntipc_aead_decrypt() goes straight from tipc_bearer_hold(b) to\ncrypto_aead_decrypt(req) without taking a reference on the netns, unlike\nthe encrypt path. When crypto_aead_decrypt() is offloaded asynchronously\n(e.g. the SIMD aead wrapper queuing to cryptd), the cryptd worker runs\ntipc_aead_decrypt_done() later. If the bearer's netns is torn down in the\nmeantime, cleanup_net() -> tipc_exit_net() -> tipc_crypto_stop() frees the\nper-netns tipc_crypto, and the completion then reads it:\ntipc_aead_decrypt_done() dereferences aead->crypto->stats and\naead->crypto->net, and tipc_crypto_rcv_complete() dereferences\naead->crypto->aead[] and the node table -- reading freed memory.\n\nDecoded KASAN splat (v7.1-rc7, CONFIG_KASAN_INLINE + TIPC + TIPC_CRYPTO):\n\n BUG: KASAN: slab-use-after-free in tipc_aead_decrypt_done (net/tipc/crypto.c:999)\n Read of size 8 at addr ffff8881056258a8 by task kworker/u16:2/51\n Workqueue: events_unbound\n Call Trace:\n tipc_aead_decrypt_done (net/tipc/crypto.c:999)\n process_one_work (kernel/workqueue.c:3314)\n worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n\n Allocated by task 169:\n __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)\n tipc_crypto_start (net/tipc/crypto.c:1502)\n tipc_init_net (net/tipc/core.c:72)\n ops_init (net/core/net_namespace.c:137)\n setup_net (net/core/net_namespace.c:446)\n copy_net_ns (net/core/net_namespace.c:579)\n create_new_namespaces (kernel/nsproxy.c:132)\n __x64_sys_unshare (kernel/fork.c:3316)\n do_syscall_64 (arch/x86/entry/syscall_64.c:63)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\n Freed by task 8:\n kfree (mm/slub.c:6566)\n tipc_exit_net (net/tipc/core.c:119)\n cleanup_net (net/core/net_namespace.c:704)\n process_one_work (kernel/workqueue.c:3314)\n kthread (kernel/kthread.c:436)\n\nThis is the same class of bug that commit e279024617134 (\"net/tipc: fix\nslab-use-after-free Read in tipc_aead_encrypt_done\") fixed for the encrypt\nside. The encrypt path takes maybe_get_net(aead->crypto->net) before\ncrypto_aead_encrypt() and drops it with put_net() on the synchronous\nreturn paths and in tipc_aead_encrypt_done(); the -EINPROGRESS/-EBUSY\nreturn keeps the reference for the async callback to release. The decrypt\npath was left without the equivalent guard.\n\nMirror the encrypt-side fix on the decrypt path: take a net reference\nbefore crypto_aead_decrypt() (failing with -ENODEV and the matching\nbearer put if it cannot be acquired), keep it across the\n-EINPROGRESS/-EBUSY async return, and drop it with put_net() on the\nsynchronous success/error return and at the end of\ntipc_aead_decrypt_done().\n\nReproduced under KASAN on v7.1-rc7: a UDP bearer with a cluster key is\nflooded with crafted encrypted frames from an unknown peer (driving the\ncluster-key decrypt path) while the bearer's netns is repeatedly torn\ndown. The completion must run asynchronously to outlive\ntipc_crypto_stop(); on x86 the stock aesni gcm(aes) now decrypts\nsynchronously, so the async path was exercised via cryptd offload. The\nunguarded aead->crypto dereference in tipc_aead_decrypt_done() is the\nunpatched upstream path; tipc_aead_decrypt() still lacks\nmaybe_get_net(aead->crypto->net), so the completion can outlive the free\non any config where crypto_aead_decrypt() goes async.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63801" }, { "summary":"CVE-2026-63801 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-63801.json" }, { "summary":"openEuler-SA-2026-3702", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3702" }, { "summary":"CVE-2026-63801", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-63801&packageName=kernel" } ], "title":"openEuler cve CVE-2026-63801", "tracking":{ "initial_release_date":"2026-09-09T18:29:07+08:00", "revision_history":[ { "date":"2026-09-09T18:29:07+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-09-09T18:29:07+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-09-09T18:29:07+08:00", "id":"CVE-2026-63801", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, 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When crypto_aead_decrypt() is offloaded asynchronously\n(e.g. the SIMD aead wrapper queuing to cryptd), the cryptd worker runs\ntipc_aead_decrypt_done() later. If the bearer's netns is torn down in the\nmeantime, cleanup_net() -> tipc_exit_net() -> tipc_crypto_stop() frees the\nper-netns tipc_crypto, and the completion then reads it:\ntipc_aead_decrypt_done() dereferences aead->crypto->stats and\naead->crypto->net, and tipc_crypto_rcv_complete() dereferences\naead->crypto->aead[] and the node table -- reading freed memory.\n\nDecoded KASAN splat (v7.1-rc7, CONFIG_KASAN_INLINE + TIPC + TIPC_CRYPTO):\n\n BUG: KASAN: slab-use-after-free in tipc_aead_decrypt_done (net/tipc/crypto.c:999)\n Read of size 8 at addr ffff8881056258a8 by task kworker/u16:2/51\n Workqueue: events_unbound\n Call Trace:\n tipc_aead_decrypt_done (net/tipc/crypto.c:999)\n process_one_work (kernel/workqueue.c:3314)\n worker_thread (kernel/workqueue.c:3397 kernel/workqueue.c:3478)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n\n Allocated by task 169:\n __kasan_kmalloc (mm/kasan/common.c:398 mm/kasan/common.c:415)\n tipc_crypto_start (net/tipc/crypto.c:1502)\n tipc_init_net (net/tipc/core.c:72)\n ops_init (net/core/net_namespace.c:137)\n setup_net (net/core/net_namespace.c:446)\n copy_net_ns (net/core/net_namespace.c:579)\n create_new_namespaces (kernel/nsproxy.c:132)\n __x64_sys_unshare (kernel/fork.c:3316)\n do_syscall_64 (arch/x86/entry/syscall_64.c:63)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\n Freed by task 8:\n kfree (mm/slub.c:6566)\n tipc_exit_net (net/tipc/core.c:119)\n cleanup_net (net/core/net_namespace.c:704)\n process_one_work (kernel/workqueue.c:3314)\n kthread (kernel/kthread.c:436)\n\nThis is the same class of bug that commit e279024617134 (\"net/tipc: fix\nslab-use-after-free Read in tipc_aead_encrypt_done\") fixed for the encrypt\nside. The encrypt path takes maybe_get_net(aead->crypto->net) before\ncrypto_aead_encrypt() and drops it with put_net() on the synchronous\nreturn paths and in tipc_aead_encrypt_done(); the -EINPROGRESS/-EBUSY\nreturn keeps the reference for the async callback to release. The decrypt\npath was left without the equivalent guard.\n\nMirror the encrypt-side fix on the decrypt path: take a net reference\nbefore crypto_aead_decrypt() (failing with -ENODEV and the matching\nbearer put if it cannot be acquired), keep it across the\n-EINPROGRESS/-EBUSY async return, and drop it with put_net() on the\nsynchronous success/error return and at the end of\ntipc_aead_decrypt_done().\n\nReproduced under KASAN on v7.1-rc7: a UDP bearer with a cluster key is\nflooded with crafted encrypted frames from an unknown peer (driving the\ncluster-key decrypt path) while the bearer's netns is repeatedly torn\ndown. The completion must run asynchronously to outlive\ntipc_crypto_stop(); on x86 the stock aesni gcm(aes) now decrypts\nsynchronously, so the async path was exercised via cryptd offload. The\nunguarded aead->crypto dereference in tipc_aead_decrypt_done() is the\nunpatched upstream path; tipc_aead_decrypt() still lacks\nmaybe_get_net(aead->crypto->net), so the completion can outlive the free\non any config where crypto_aead_decrypt() goes async.\n\nFound by 0sec automated security-research tooling (https://0sec.ai).", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-331.0.0.232.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-331.0.0.232.oe2203sp4.aarch64", 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