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Message-ID: <2024102936-CVE-2024-50077-2940@gregkh> Date: Tue, 29 Oct 2024 01:50:40 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-50077: Bluetooth: ISO: Fix multiple init when debugfs is disabled Description =========== In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix multiple init when debugfs is disabled If bt_debugfs is not created successfully, which happens if either CONFIG_DEBUG_FS or CONFIG_DEBUG_FS_ALLOW_ALL is unset, then iso_init() returns early and does not set iso_inited to true. This means that a subsequent call to iso_init() will result in duplicate calls to proto_register(), bt_sock_register(), etc. With CONFIG_LIST_HARDENED and CONFIG_BUG_ON_DATA_CORRUPTION enabled, the duplicate call to proto_register() triggers this BUG(): list_add double add: new=ffffffffc0b280d0, prev=ffffffffbab56250, next=ffffffffc0b280d0. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:35! Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 2 PID: 887 Comm: bluetoothd Not tainted 6.10.11-1-ao-desktop #1 RIP: 0010:__list_add_valid_or_report+0x9a/0xa0 ... __list_add_valid_or_report+0x9a/0xa0 proto_register+0x2b5/0x340 iso_init+0x23/0x150 [bluetooth] set_iso_socket_func+0x68/0x1b0 [bluetooth] kmem_cache_free+0x308/0x330 hci_sock_sendmsg+0x990/0x9e0 [bluetooth] __sock_sendmsg+0x7b/0x80 sock_write_iter+0x9a/0x110 do_iter_readv_writev+0x11d/0x220 vfs_writev+0x180/0x3e0 do_writev+0xca/0x100 ... This change removes the early return. The check for iso_debugfs being NULL was unnecessary, it is always NULL when iso_inited is false. The Linux kernel CVE team has assigned CVE-2024-50077 to this issue. Affected and fixed versions =========================== Issue introduced in 6.0 with commit ccf74f2390d6 and fixed in 6.1.114 with commit fa4b832c5a6e Issue introduced in 6.0 with commit ccf74f2390d6 and fixed in 6.6.58 with commit 8fb8e912afb4 Issue introduced in 6.0 with commit ccf74f2390d6 and fixed in 6.11.5 with commit adf1b179c2ff Issue introduced in 6.0 with commit ccf74f2390d6 and fixed in 6.12-rc4 with commit a9b7b535ba19 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-50077 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/bluetooth/iso.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/fa4b832c5a6ec35023a1b997cf658c436619c752 https://git.kernel.org/stable/c/8fb8e912afb4c47dec12ea9a5853e7a8db95816f https://git.kernel.org/stable/c/adf1b179c2ff8073c24bf87e5a605fcc5a09798b https://git.kernel.org/stable/c/a9b7b535ba192c6b77e6c15a4c82d853163eab8c
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