CVE-2021-46929 (GCVE-0-2021-46929)

Vulnerability from cvelistv5 – Published: 2024-02-27 09:43 – Updated: 2026-05-11 13:44
VLAI
Title
sctp: use call_rcu to free endpoint
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: use call_rcu to free endpoint This patch is to delay the endpoint free by calling call_rcu() to fix another use-after-free issue in sctp_sock_dump(): BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20 Call Trace: __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [inline] __lock_sock+0x203/0x350 net/core/sock.c:2253 lock_sock_nested+0xfe/0x120 net/core/sock.c:2774 lock_sock include/net/sock.h:1492 [inline] sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324 sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c:5091 sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527 __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049 inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065 netlink_dump+0x606/0x1080 net/netlink/af_netlink.c:2244 __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352 netlink_dump_start include/linux/netlink.h:216 [inline] inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170 __sock_diag_cmd net/core/sock_diag.c:232 [inline] sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274 This issue occurs when asoc is peeled off and the old sk is freed after getting it by asoc->base.sk and before calling lock_sock(sk). To prevent the sk free, as a holder of the sk, ep should be alive when calling lock_sock(). This patch uses call_rcu() and moves sock_put and ep free into sctp_endpoint_destroy_rcu(), so that it's safe to try to hold the ep under rcu_read_lock in sctp_transport_traverse_process(). If sctp_endpoint_hold() returns true, it means this ep is still alive and we have held it and can continue to dump it; If it returns false, it means this ep is dead and can be freed after rcu_read_unlock, and we should skip it. In sctp_sock_dump(), after locking the sk, if this ep is different from tsp->asoc->ep, it means during this dumping, this asoc was peeled off before calling lock_sock(), and the sk should be skipped; If this ep is the same with tsp->asoc->ep, it means no peeloff happens on this asoc, and due to lock_sock, no peeloff will happen either until release_sock. Note that delaying endpoint free won't delay the port release, as the port release happens in sctp_endpoint_destroy() before calling call_rcu(). Also, freeing endpoint by call_rcu() makes it safe to access the sk by asoc->base.sk in sctp_assocs_seq_show() and sctp_rcv(). Thanks Jones to bring this issue up. v1->v2: - improve the changelog. - add kfree(ep) into sctp_endpoint_destroy_rcu(), as Jakub noticed.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < 8873140f95d4977bf37e4cf0d5c5e3f6e34cdd3e (git)
Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < af6e6e58f7ebf86b4e7201694b1e4f3a62cbc3ec (git)
Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < 831de271452b87657fcf8d715ee20519b79caef5 (git)
Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < 769d14abd35e0e153b5149c3e1e989a9d719e3ff (git)
Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < 75799e71df1da11394740b43ae5686646179561d (git)
Affected: d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab , < 5ec7d18d1813a5bead0b495045606c93873aecbb (git)
Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 4.14.261 , ≤ 4.14.* (semver)
Unaffected: 4.19.224 , ≤ 4.19.* (semver)
Unaffected: 5.4.170 , ≤ 5.4.* (semver)
Unaffected: 5.10.90 , ≤ 5.10.* (semver)
Unaffected: 5.15.13 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46929\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T10:15:07.573\",\"lastModified\":\"2026-06-17T04:15:53.040\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: use call_rcu to free endpoint\\n\\nThis patch is to delay the endpoint free by calling call_rcu() to fix\\nanother use-after-free issue in sctp_sock_dump():\\n\\n  BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20\\n  Call Trace:\\n    __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218\\n    lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844\\n    __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]\\n    _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168\\n    spin_lock_bh include/linux/spinlock.h:334 [inline]\\n    __lock_sock+0x203/0x350 net/core/sock.c:2253\\n    lock_sock_nested+0xfe/0x120 net/core/sock.c:2774\\n    lock_sock include/net/sock.h:1492 [inline]\\n    sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324\\n    sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c:5091\\n    sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527\\n    __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049\\n    inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065\\n    netlink_dump+0x606/0x1080 net/netlink/af_netlink.c:2244\\n    __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352\\n    netlink_dump_start include/linux/netlink.h:216 [inline]\\n    inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170\\n    __sock_diag_cmd net/core/sock_diag.c:232 [inline]\\n    sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263\\n    netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477\\n    sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274\\n\\nThis issue occurs when asoc is peeled off and the old sk is freed after\\ngetting it by asoc-\u003ebase.sk and before calling lock_sock(sk).\\n\\nTo prevent the sk free, as a holder of the sk, ep should be alive when\\ncalling lock_sock(). This patch uses call_rcu() and moves sock_put and\\nep free into sctp_endpoint_destroy_rcu(), so that it\u0027s safe to try to\\nhold the ep under rcu_read_lock in sctp_transport_traverse_process().\\n\\nIf sctp_endpoint_hold() returns true, it means this ep is still alive\\nand we have held it and can continue to dump it; If it returns false,\\nit means this ep is dead and can be freed after rcu_read_unlock, and\\nwe should skip it.\\n\\nIn sctp_sock_dump(), after locking the sk, if this ep is different from\\ntsp-\u003easoc-\u003eep, it means during this dumping, this asoc was peeled off\\nbefore calling lock_sock(), and the sk should be skipped; If this ep is\\nthe same with tsp-\u003easoc-\u003eep, it means no peeloff happens on this asoc,\\nand due to lock_sock, no peeloff will happen either until release_sock.\\n\\nNote that delaying endpoint free won\u0027t delay the port release, as the\\nport release happens in sctp_endpoint_destroy() before calling call_rcu().\\nAlso, freeing endpoint by call_rcu() makes it safe to access the sk by\\nasoc-\u003ebase.sk in sctp_assocs_seq_show() and sctp_rcv().\\n\\nThanks Jones to bring this issue up.\\n\\nv1-\u003ev2:\\n  - improve the changelog.\\n  - add kfree(ep) into sctp_endpoint_destroy_rcu(), as Jakub noticed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sctp: use call_rcu para liberar el endpoint. Este parche tiene como objetivo retrasar la liberaci\u00f3n del endpoint llamando a call_rcu() para solucionar otro problema de use-after-free en sctp_sock_dump(): ERROR: KASAN: use-after-free en __lock_acquire+0x36d9/0x4c20 Rastreo de llamadas: __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 __raw_spin_lock_bh include/linux/spinlock_api_smp.h :135 [en l\u00ednea] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168 spin_lock_bh include/linux/spinlock.h:334 [en l\u00ednea] __lock_sock+0x203/0x350 net/core/sock.c:2253 lock_sock_nested+0xfe/ 0x120 net/core/sock.c:2774 lock_sock include/net/sock.h:1492 [en l\u00ednea] sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324 sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c: 5091 sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527 __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049 inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065 netlink_dump+0x6 06/0x1080 neto/ netlink/af_netlink.c:2244 __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352 netlink_dump_start include/linux/netlink.h:216 [en l\u00ednea] inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170 __sock_diag_cm re neto /core/sock_diag.c:232 [en l\u00ednea] sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477 sock_diag_rcv+0x2a/0x40 net/core/sock_diag. c:274 Este problema ocurre cuando se quita asoc y se libera el sk antiguo despu\u00e9s de obtenerlo mediante asoc-\u0026gt;base.sk y antes de llamar a lock_sock(sk). Para evitar que sk se libere, como titular de sk, ep debe estar activo al llamar a lock_sock(). Este parche usa call_rcu() y mueve sock_put y ep free a sctp_endpoint_destroy_rcu(), por lo que es seguro intentar mantener el ep bajo rcu_read_lock en sctp_transport_traverse_process(). Si sctp_endpoint_hold() devuelve verdadero, significa que este ep todav\u00eda est\u00e1 vivo, lo hemos retenido y podemos continuar descart\u00e1ndolo; Si devuelve falso, significa que este ep est\u00e1 muerto y puede liberarse despu\u00e9s de rcu_read_unlock, y debemos omitirlo. En sctp_sock_dump(), despu\u00e9s de bloquear el sk, si este ep es diferente de tsp-\u0026gt;asoc-\u0026gt;ep, significa que durante este volcado, este asoc se elimin\u00f3 antes de llamar a lock_sock(), y el sk debe omitirse; Si este ep es el mismo con tsp-\u0026gt;asoc-\u0026gt;ep, significa que no se produce ning\u00fan despegue en este asoc y, debido a lock_sock, tampoco se producir\u00e1 ning\u00fan despegue hasta que se libere_sock. Tenga en cuenta que retrasar la liberaci\u00f3n del endpoint  no retrasar\u00e1 la liberaci\u00f3n del puerto, ya que la liberaci\u00f3n del puerto ocurre en sctp_endpoint_destroy() antes de llamar a call_rcu(). Adem\u00e1s, liberar el endpoint mediante call_rcu() hace que sea seguro acceder a sk mediante asoc-\u0026gt;base.sk en sctp_assocs_seq_show() y sctp_rcv(). Gracias Jones por plantear este problema. v1-\u0026gt;v2: - mejorar el registro de cambios. - agregue kfree(ep) a sctp_endpoint_destroy_rcu(), como not\u00f3 Jakub.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/sctp/sctp.h\",\"include/net/sctp/structs.h\",\"net/sctp/diag.c\",\"net/sctp/endpointola.c\",\"net/sctp/socket.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"8873140f95d4977bf37e4cf0d5c5e3f6e34cdd3e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"af6e6e58f7ebf86b4e7201694b1e4f3a62cbc3ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"831de271452b87657fcf8d715ee20519b79caef5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"769d14abd35e0e153b5149c3e1e989a9d719e3ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"75799e71df1da11394740b43ae5686646179561d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab\",\"lessThan\":\"5ec7d18d1813a5bead0b495045606c93873aecbb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/sctp/sctp.h\",\"include/net/sctp/structs.h\",\"net/sctp/diag.c\",\"net/sctp/endpointola.c\",\"net/sctp/socket.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.261\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.224\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.170\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.90\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.13\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-09-10T16:02:00.945845Z\",\"id\":\"CVE-2021-46929\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:46:22+00:00",
      "cve": "CVE-2021-46929",
      "id": "CVE-2021-46929",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: use call_rcu to free endpoint",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46929.json",
      "version": "3"
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\"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.14\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.14\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.224\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.170\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.90\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/sctp/sctp.h\", \"include/net/sctp/structs.h\", \"net/sctp/diag.c\", \"net/sctp/endpointola.c\", \"net/sctp/socket.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8873140f95d4977bf37e4cf0d5c5e3f6e34cdd3e\"}, {\"url\": \"https://git.kernel.org/stable/c/af6e6e58f7ebf86b4e7201694b1e4f3a62cbc3ec\"}, {\"url\": \"https://git.kernel.org/stable/c/831de271452b87657fcf8d715ee20519b79caef5\"}, {\"url\": \"https://git.kernel.org/stable/c/769d14abd35e0e153b5149c3e1e989a9d719e3ff\"}, {\"url\": \"https://git.kernel.org/stable/c/75799e71df1da11394740b43ae5686646179561d\"}, {\"url\": \"https://git.kernel.org/stable/c/5ec7d18d1813a5bead0b495045606c93873aecbb\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: use call_rcu to free endpoint\\n\\nThis patch is to delay the endpoint free by calling call_rcu() to fix\\nanother use-after-free issue in sctp_sock_dump():\\n\\n  BUG: KASAN: use-after-free in __lock_acquire+0x36d9/0x4c20\\n  Call Trace:\\n    __lock_acquire+0x36d9/0x4c20 kernel/locking/lockdep.c:3218\\n    lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844\\n    __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]\\n    _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:168\\n    spin_lock_bh include/linux/spinlock.h:334 [inline]\\n    __lock_sock+0x203/0x350 net/core/sock.c:2253\\n    lock_sock_nested+0xfe/0x120 net/core/sock.c:2774\\n    lock_sock include/net/sock.h:1492 [inline]\\n    sctp_sock_dump+0x122/0xb20 net/sctp/diag.c:324\\n    sctp_for_each_transport+0x2b5/0x370 net/sctp/socket.c:5091\\n    sctp_diag_dump+0x3ac/0x660 net/sctp/diag.c:527\\n    __inet_diag_dump+0xa8/0x140 net/ipv4/inet_diag.c:1049\\n    inet_diag_dump+0x9b/0x110 net/ipv4/inet_diag.c:1065\\n    netlink_dump+0x606/0x1080 net/netlink/af_netlink.c:2244\\n    __netlink_dump_start+0x59a/0x7c0 net/netlink/af_netlink.c:2352\\n    netlink_dump_start include/linux/netlink.h:216 [inline]\\n    inet_diag_handler_cmd+0x2ce/0x3f0 net/ipv4/inet_diag.c:1170\\n    __sock_diag_cmd net/core/sock_diag.c:232 [inline]\\n    sock_diag_rcv_msg+0x31d/0x410 net/core/sock_diag.c:263\\n    netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477\\n    sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:274\\n\\nThis issue occurs when asoc is peeled off and the old sk is freed after\\ngetting it by asoc-\u003ebase.sk and before calling lock_sock(sk).\\n\\nTo prevent the sk free, as a holder of the sk, ep should be alive when\\ncalling lock_sock(). This patch uses call_rcu() and moves sock_put and\\nep free into sctp_endpoint_destroy_rcu(), so that it\u0027s safe to try to\\nhold the ep under rcu_read_lock in sctp_transport_traverse_process().\\n\\nIf sctp_endpoint_hold() returns true, it means this ep is still alive\\nand we have held it and can continue to dump it; If it returns false,\\nit means this ep is dead and can be freed after rcu_read_unlock, and\\nwe should skip it.\\n\\nIn sctp_sock_dump(), after locking the sk, if this ep is different from\\ntsp-\u003easoc-\u003eep, it means during this dumping, this asoc was peeled off\\nbefore calling lock_sock(), and the sk should be skipped; If this ep is\\nthe same with tsp-\u003easoc-\u003eep, it means no peeloff happens on this asoc,\\nand due to lock_sock, no peeloff will happen either until release_sock.\\n\\nNote that delaying endpoint free won\u0027t delay the port release, as the\\nport release happens in sctp_endpoint_destroy() before calling call_rcu().\\nAlso, freeing endpoint by call_rcu() makes it safe to access the sk by\\nasoc-\u003ebase.sk in sctp_assocs_seq_show() and sctp_rcv().\\n\\nThanks Jones to bring this issue up.\\n\\nv1-\u003ev2:\\n  - improve the changelog.\\n  - add kfree(ep) into sctp_endpoint_destroy_rcu(), as Jakub noticed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.261\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.224\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.170\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.90\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.13\", \"versionStartIncluding\": \"4.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"4.14\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:44:37.844Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46929\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:44:37.844Z\", \"dateReserved\": \"2024-02-25T13:45:52.720Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T09:43:58.047Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.