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CVE-2024-36489
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CVE-2024-36489
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
In the Linux kernel, the following vulnerability has been resolved:
tls: fix missing memory barrier in tls_init
In tlsinit(), 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.
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General Information
Vendors
- linux
Products
- linux kernel
References
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Technical Analysis
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