Vulnerability Details CVE-2026-53276
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer
In iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is
dropped:
bis = iso_pi(sk)->conn->hcon;
/* Release the socket before lookups since that requires hci_dev_lock
* which shall not be acquired while holding sock_lock for proper
* ordering.
*/
release_sock(sk);
hci_dev_lock(bis->hdev);
During the unlocked window, could a concurrent close() destroy the connection
and free the bis structure, causing hci_dev_lock(bis->hdev) to access memory
after it is freed, fix this by using the hdev reference which was safely
acquired via iso_conn_get_hdev().
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 2.2%
CVSS Severity
CVSS v3 Score 7.8
References
Products affected by CVE-2026-53276
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cpe:2.3:o:linux:linux_kernel:6.19
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cpe:2.3:o:linux:linux_kernel:6.19.1
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cpe:2.3:o:linux:linux_kernel:6.19.10
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cpe:2.3:o:linux:linux_kernel:6.19.11
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cpe:2.3:o:linux:linux_kernel:6.19.12
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cpe:2.3:o:linux:linux_kernel:6.19.13
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cpe:2.3:o:linux:linux_kernel:6.19.14
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cpe:2.3:o:linux:linux_kernel:6.19.3
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cpe:2.3:o:linux:linux_kernel:6.19.4
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cpe:2.3:o:linux:linux_kernel:6.19.6
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cpe:2.3:o:linux:linux_kernel:6.19.7
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cpe:2.3:o:linux:linux_kernel:6.19.8
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cpe:2.3:o:linux:linux_kernel:6.19.9
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cpe:2.3:o:linux:linux_kernel:7.0
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cpe:2.3:o:linux:linux_kernel:7.0.1
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cpe:2.3:o:linux:linux_kernel:7.0.10
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cpe:2.3:o:linux:linux_kernel:7.0.11
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cpe:2.3:o:linux:linux_kernel:7.0.12
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cpe:2.3:o:linux:linux_kernel:7.0.2
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cpe:2.3:o:linux:linux_kernel:7.0.3
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cpe:2.3:o:linux:linux_kernel:7.0.4
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cpe:2.3:o:linux:linux_kernel:7.0.5
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cpe:2.3:o:linux:linux_kernel:7.0.6
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cpe:2.3:o:linux:linux_kernel:7.0.7
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cpe:2.3:o:linux:linux_kernel:7.0.8
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cpe:2.3:o:linux:linux_kernel:7.0.9
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cpe:2.3:o:linux:linux_kernel:7.1