Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready iso_conn_ready() looks up the BIS listener socket with iso_get_sock(), which takes a reference, and then, without re-checking its state, creates a child socket from it: parent = iso_get_sock(hdev, ...); if (!parent) return; lock_sock(parent); sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...); ... iso_chan_add(conn, sk, parent); ... release_sock(parent); sock_put(parent); If the listener socket is closed concurrently, between iso_get_sock() and lock_sock(), the reference taken by iso_get_sock() may be the last one: the close path drops the link-list reference, and once iso_conn_ready() drops its own reference at the end of the function the socket is freed. The child socket, however, is already linked to the freed parent, and a later disconnect of the child runs iso_chan_del() -> bt_accept_unlink(), which dereferences the dangling parent pointer into the freed accept queue (a use-after-free). The same dangling pointer is also dereferenced through parent->***() in iso_chan_del(). Fix it the same way the connected (non-BIS) path was fixed in commit 0d255e63fcf3 ("Bluetooth: ISO: hold sk properly in iso_conn_ready"): after taking the socket lock, re-check that the parent is still a listening, alive socket, and bail out otherwise.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in 1702f12cf59a1c3b670eb6bb4a4d6fcccf07e3b8; From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in d47b8f8c02a3d3f282693e5a4ff1f6b4b00518de; From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in 2387cd06a2c0b416f05028b02bba1089f54c28d9; From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in 49fd7116f76b860b230843700fb7423ab5331e1f; From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in 03288b7447c9e572f8ab82fc29cfb4ca719ab210; From ccf74f2390d60a2f9a75ef496d2564abb478f46a · fixed in 560bef609fa5992745929e8d7d458b9d88dd2830
- Linux Linux
6.0
- KernelLinux
From 6.0.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4