CVE-2024-36489 (GCVE-0-2024-36489)

Vulnerability from cvelistv5 – Published: 2024-06-21 10:18 – Updated: 2026-10-15 00:42
VLAI
Title
tls: fix missing memory barrier in tls_init
Summary
In the Linux kernel, the following vulnerability has been resolved: tls: fix missing memory barrier in tls_init In tls_init(), a write memory barrier is missing, and store-store reordering may cause NULL dereference in tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // In tls_init() // In tls_ctx_create() ctx = kzalloc() ctx->sk_proto = READ_ONCE(sk->sk_prot) -(1) // In update_sk_prot() WRITE_ONCE(sk->sk_prot, tls_prots) -(2) // In sock_common_setsockopt() READ_ONCE(sk->sk_prot)->setsockopt() // In tls_{setsockopt,getsockopt}() ctx->sk_proto->setsockopt() -(3) In the above scenario, when (1) and (2) are reordered, (3) can observe the NULL value of ctx->sk_proto, causing NULL dereference. To fix it, we rely on rcu_assign_pointer() which implies the release barrier semantic. By moving rcu_assign_pointer() after ctx->sk_proto is initialized, we can ensure that ctx->sk_proto are visible when changing sk->sk_prot.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:09 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < d72e126e9a36d3d33889829df8fc90100bb0e071 (git)
Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < 2c260a24cf1c4d30ea3646124f766ee46169280b (git)
Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < 335c8f1566d8e44c384d16b450a18554896d4e8b (git)
Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < ab67c2fd3d070a21914d0c31319d3858ab4e199c (git)
Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < ef21007a7b581c7fe64d5a10c320880a033c837b (git)
Affected: d5bee7374b68de3c44586d46e9e61ffc97a1e886 , < 91e61dd7a0af660408e87372d8330ceb218be302 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.219 , ≤ 5.10.* (semver)
Unaffected: 5.15.161 , ≤ 5.15.* (semver)
Unaffected: 6.1.93 , ≤ 6.1.* (semver)
Unaffected: 6.6.33 , ≤ 6.6.* (semver)
Unaffected: 6.9.4 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.1 (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Unaffected: 0 , < * (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.1 (custom)
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Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < V1.1.1 (custom)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: fix missing memory barrier in tls_init\n\nIn tls_init(), a write memory barrier is missing, and store-store\nreordering may cause NULL dereference in tls_{setsockopt,getsockopt}.\n\nCPU0                               CPU1\n-----                              -----\n// In tls_init()\n// In tls_ctx_create()\nctx = kzalloc()\nctx-\u003esk_proto = READ_ONCE(sk-\u003esk_prot) -(1)\n\n// In update_sk_prot()\nWRITE_ONCE(sk-\u003esk_prot, tls_prots)     -(2)\n\n                                   // In sock_common_setsockopt()\n                                   READ_ONCE(sk-\u003esk_prot)-\u003esetsockopt()\n\n                                   // In tls_{setsockopt,getsockopt}()\n                                   ctx-\u003esk_proto-\u003esetsockopt()    -(3)\n\nIn the above scenario, when (1) and (2) are reordered, (3) can observe\nthe NULL value of ctx-\u003esk_proto, causing NULL dereference.\n\nTo fix it, we rely on rcu_assign_pointer() which implies the release\nbarrier semantic. By moving rcu_assign_pointer() after ctx-\u003esk_proto is\ninitialized, we can ensure that ctx-\u003esk_proto are visible when\nchanging sk-\u003esk_prot."
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            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tls: corrige la barrera de memoria faltante en tls_init En tls_init(), falta una barrera de memoria de escritura y el reordenamiento tienda-tienda puede causar una desreferencia NULL en tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // En tls_init() // En tls_ctx_create() ctx = kzalloc() ctx-\u0026gt;sk_proto = READ_ONCE(sk-\u0026gt;sk_prot) -(1) // En update_sk_prot( ) WRITE_ONCE(sk-\u0026gt;sk_prot, tls_prots) -(2) // En sock_common_setsockopt() READ_ONCE(sk-\u0026gt;sk_prot)-\u0026gt;setsockopt() // En tls_{setsockopt,getsockopt}() ctx-\u0026gt;sk_proto-\u0026gt;setsockopt () -(3) En el escenario anterior, cuando (1) y (2) se reordenan, (3) puede observar el valor NULL de ctx-\u0026gt;sk_proto, lo que provoca la desreferencia NULL. Para solucionarlo, confiamos en rcu_assign_pointer() que implica la sem\u00e1ntica de barrera de liberaci\u00f3n. Al mover rcu_assign_pointer() despu\u00e9s de inicializar ctx-\u0026gt;sk_proto, podemos asegurarnos de que ctx-\u0026gt;sk_proto sean visibles al cambiar sk-\u0026gt;sk_prot."
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