CVE - CVE-2024-36489

CVE-ID
CVE-2024-36489	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/2c260a24cf1c4d30ea3646124f766ee46169280b URL:https://git.kernel.org/stable/c/2c260a24cf1c4d30ea3646124f766ee46169280b MISC:https://git.kernel.org/stable/c/335c8f1566d8e44c384d16b450a18554896d4e8b URL:https://git.kernel.org/stable/c/335c8f1566d8e44c384d16b450a18554896d4e8b MISC:https://git.kernel.org/stable/c/91e61dd7a0af660408e87372d8330ceb218be302 URL:https://git.kernel.org/stable/c/91e61dd7a0af660408e87372d8330ceb218be302 MISC:https://git.kernel.org/stable/c/ab67c2fd3d070a21914d0c31319d3858ab4e199c URL:https://git.kernel.org/stable/c/ab67c2fd3d070a21914d0c31319d3858ab4e199c MISC:https://git.kernel.org/stable/c/d72e126e9a36d3d33889829df8fc90100bb0e071 URL:https://git.kernel.org/stable/c/d72e126e9a36d3d33889829df8fc90100bb0e071 MISC:https://git.kernel.org/stable/c/ef21007a7b581c7fe64d5a10c320880a033c837b URL:https://git.kernel.org/stable/c/ef21007a7b581c7fe64d5a10c320880a033c837b
Assigning CNA
kernel.org
Date Record Created
20240621	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240621)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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