{
"dataType": "CVE_RECORD",
"cveMetadata": {
"cveId": "CVE-2024-27399",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-02-25T13:47:42.681Z",
"datePublished": "2024-05-13T10:24:57.045Z",
"dateUpdated": "2024-09-26T15:03:06.207Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2024-05-29T05:28:25.796Z"
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout\n\nThere is a race condition between l2cap_chan_timeout() and\nl2cap_chan_del(). When we use l2cap_chan_del() to delete the\nchannel, the chan->conn will be set to null. But the conn could\nbe dereferenced again in the mutex_lock() of l2cap_chan_timeout().\nAs a result the null pointer dereference bug will happen. The\nKASAN report triggered by POC is shown below:\n\n[ 472.074580] ==================================================================\n[ 472.075284] BUG: KASAN: null-ptr-deref in mutex_lock+0x68/0xc0\n[ 472.075308] Write of size 8 at addr 0000000000000158 by task kworker/0:0/7\n[ 472.075308]\n[ 472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36\n[ 472.075308] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4\n[ 472.075308] Workqueue: events l2cap_chan_timeout\n[ 472.075308] Call Trace:\n[ 472.075308] \n[ 472.075308] dump_stack_lvl+0x137/0x1a0\n[ 472.075308] print_report+0x101/0x250\n[ 472.075308] ? __virt_addr_valid+0x77/0x160\n[ 472.075308] ? mutex_lock+0x68/0xc0\n[ 472.075308] kasan_report+0x139/0x170\n[ 472.075308] ? mutex_lock+0x68/0xc0\n[ 472.075308] kasan_check_range+0x2c3/0x2e0\n[ 472.075308] mutex_lock+0x68/0xc0\n[ 472.075308] l2cap_chan_timeout+0x181/0x300\n[ 472.075308] process_one_work+0x5d2/0xe00\n[ 472.075308] worker_thread+0xe1d/0x1660\n[ 472.075308] ? pr_cont_work+0x5e0/0x5e0\n[ 472.075308] kthread+0x2b7/0x350\n[ 472.075308] ? pr_cont_work+0x5e0/0x5e0\n[ 472.075308] ? kthread_blkcg+0xd0/0xd0\n[ 472.075308] ret_from_fork+0x4d/0x80\n[ 472.075308] ? kthread_blkcg+0xd0/0xd0\n[ 472.075308] ret_from_fork_asm+0x11/0x20\n[ 472.075308] \n[ 472.075308] ==================================================================\n[ 472.094860] Disabling lock debugging due to kernel taint\n[ 472.096136] BUG: kernel NULL pointer dereference, address: 0000000000000158\n[ 472.096136] #PF: supervisor write access in kernel mode\n[ 472.096136] #PF: error_code(0x0002) - not-present page\n[ 472.096136] PGD 0 P4D 0\n[ 472.096136] Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI\n[ 472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Tainted: G B 6.9.0-rc5-00356-g78c0094a146b #36\n[ 472.096136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4\n[ 472.096136] Workqueue: events l2cap_chan_timeout\n[ 472.096136] RIP: 0010:mutex_lock+0x88/0xc0\n[ 472.096136] Code: be 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00 74 08 48 88\n[ 472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246\n[ 472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865\n[ 472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78\n[ 472.096136] RBP: 0000000000000158 R08: ffff88800744fc7f R09: 1ffff11000e89f8f\n[ 472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000\n[ 472.096136] R13: 0000000000000158 R14: ffff88800744fc78 R15: ffff888007405a00\n[ 472.096136] FS: 0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000\n[ 472.096136] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0\n[ 472.096136] Call Trace:\n[ 472.096136] \n[ 472.096136] ? __die_body+0x8d/0xe0\n[ 472.096136] ? page_fault_oops+0x6b8/0x9a0\n[ 472.096136] ? kernelmode_fixup_or_oops+0x20c/0x2a0\n[ 472.096136] ? do_user_addr_fault+0x1027/0x1340\n[ 472.096136] ? _printk+0x7a/0xa0\n[ 472.096136] ? mutex_lock+0x68/0xc0\n[ 472.096136] ? add_taint+0x42/0xd0\n[ 472.096136] ? exc_page_fault+0x6a/0x1b0\n[ 472.096136] ? asm_exc_page_fault+0x26/0x30\n[ 472.096136] ? mutex_lock+0x75/0xc0\n[ 472.096136] ? mutex_lock+0x88/0xc0\n[ 472.096136] ? mutex_lock+0x75/0xc0\n[ 472.096136] l2cap_chan_timeo\n---truncated---"
}
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"title": "Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout",
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