CVE-2026-74536Bluetooth: ISO: fix leaking sk after socket release
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix leaking sk after socket release iso_sock_kill() tests !sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket || sock_flag(sk, SOCK_DEAD) for early return, but this is always true since sock_orphan(sk) sets SOCK_DEAD, so the sk reference released by socket always leaks, iso_sock_destruct is never called. The socket reference also leaks when __iso_sock_close() does not set SOCK_ZAPPED, since iso_conn_del() does not call iso_sock_kill() after zapping. Fix by replacing SOCK_DEAD by BT_SK_KILLED flag that is not used for something else, and lock_sock to ensure iso_sock_kill() puts sk only after socket release only once. Release and iso_conn_del may run concurrently. Call iso_sock_kill() from iso_conn_del() to clean sk up after zapping. Remove call to iso_sock_kill() from iso_sock_close(), as it's generally no-op there.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from ccf74f2390d60a2f9a75ef496d2564abb478f46a before 96ed3c772c08e7a91c399567f412618e43231023; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before e76a0ae6542ae43241b2147bacf4990e7ae5316a; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before e30e5ca63c8fbe3cd505fbb419bb547760cda633; from ccf74f2390d60a2f9a75ef496d2564abb478f46a before ce57442a379212fe3fda59c9437ee8217eceb5b1 | CNA record |
References
- https://git.kernel.org/stable/c/96ed3c772c08e7a91c399567f412618e43231023
- https://git.kernel.org/stable/c/e76a0ae6542ae43241b2147bacf4990e7ae5316a
- https://git.kernel.org/stable/c/e30e5ca63c8fbe3cd505fbb419bb547760cda633
- https://git.kernel.org/stable/c/ce57442a379212fe3fda59c9437ee8217eceb5b1
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.