Bug 2536622 (CVE-2026-90225)

Summary: CVE-2026-90225 kernel: nfc: llcp: read llcp_sock->local under the socket lock in getsockopt
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Near Field Communication (NFC) Logical Link Control Protocol (LLCP) subsystem of the Linux kernel. A race condition exists between the `nfc_llcp_getsockopt()` and `llcp_sock_bind()` functions. This allows a local attacker to potentially cause a use-after-free vulnerability by racing a `getsockopt()` call with an in-flight `bind()` operation, leading to memory corruption or a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-17 18:54:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nfc: llcp: read llcp_sock->local under the socket lock in getsockopt

nfc_llcp_getsockopt() read llcp_sock->local before lock_sock(sk) and
then dereferenced the cached pointer inside the locked region.
llcp_sock_bind() assigns and clears llcp_sock->local under the same
socket lock, dropping the last reference on its error path. A
getsockopt() racing an in-flight bind() can observe the pointer, block
on lock_sock(), and then dereference a freed nfc_llcp_local once bind()
has unwound.

Move the llcp_sock->local read and the NULL check inside the
lock_sock(sk) region so bind() cannot mutate or free the pointer between
the load and the use.
Comment 1 Mauro Matteo Cascella 2026-09-24 14:02:48 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-90225.mbox