CVSS: 5.5EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47457 – can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible()
https://notcve.org/view.php?id=CVE-2021-47457
In the Linux kernel, the following vulnerability has been resolved: can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible() Using wait_event_interruptible() to wait for complete transmission, but do not check the result of wait_event_interruptible() which can be interrupted. It will result in TX buffer has multiple accessors and the later process interferes with the previous process. Following is one of the problems reported by syzbot. ============================================================= WARNING: CPU: 0 PID: 0 at net/can/isotp.c:840 isotp_tx_timer_handler+0x2e0/0x4c0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc7+ #68 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:isotp_tx_timer_handler+0x2e0/0x4c0 Call Trace: <IRQ> ? isotp_setsockopt+0x390/0x390 __hrtimer_run_queues+0xb8/0x610 hrtimer_run_softirq+0x91/0xd0 ? rcu_read_lock_sched_held+0x4d/0x80 __do_softirq+0xe8/0x553 irq_exit_rcu+0xf8/0x100 sysvec_apic_timer_interrupt+0x9e/0xc0 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 Add result check for wait_event_interruptible() in isotp_sendmsg() to avoid multiple accessers for tx buffer. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: isotp: isotp_sendmsg(): agregar verificación de resultado para wait_event_interruptible() Usar wait_event_interruptible() para esperar la transmisión completa, pero no verificar el resultado de wait_event_interruptible() que puede ser interrumpido. • https://git.kernel.org/stable/c/e057dd3fc20ffb3d7f150af46542a51b59b90127 https://git.kernel.org/stable/c/053bc12df0d6097c1126d0e14fa778a0a8faeb64 https://git.kernel.org/stable/c/a76abedd2be3926d6deba236a935c7f98abf9110 https://git.kernel.org/stable/c/9acf636215a6ce9362fe618e7da4913b8bfe84c8 https://access.redhat.com/security/cve/CVE-2021-47457 https://bugzilla.redhat.com/show_bug.cgi?id=2282901 • CWE-99: Improper Control of Resource Identifiers ('Resource Injection') •
CVSS: 8.4EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47456 – can: peak_pci: peak_pci_remove(): fix UAF
https://notcve.org/view.php?id=CVE-2021-47456
In the Linux kernel, the following vulnerability has been resolved: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250 En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: pico_pci: pico_pci_remove(): arreglar UAF Cuando se elimina el módulo peek_pci, hacer referencia a 'chan' nuevamente después de liberar 'dev' causará UAF. Solucione este problema lanzando 'dev' más tarde. • https://git.kernel.org/stable/c/e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38 https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9 https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250 https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9 https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699 https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69 https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640 • CWE-416: Use After Free CWE-467: Use of sizeof() on a Pointer Type •
CVSS: 5.1EPSS: 0%CPEs: 8EXPL: 0CVE-2021-47455 – ptp: Fix possible memory leak in ptp_clock_register()
https://notcve.org/view.php?id=CVE-2021-47455
In the Linux kernel, the following vulnerability has been resolved: ptp: Fix possible memory leak in ptp_clock_register() I got memory leak as follows when doing fault injection test: unreferenced object 0xffff88800906c618 (size 8): comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s) hex dump (first 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0 [<0000000079f6e2ff>] kvasprintf+0xb5/0x150 [<0000000026aae54f>] kvasprintf_const+0x60/0x190 [<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150 [<000000004e35abdd>] dev_set_name+0xc0/0x100 [<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp] [<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] When posix_clock_register() returns an error, the name allocated in dev_set_name() will be leaked, the put_device() should be used to give up the device reference, then the name will be freed in kobject_cleanup() and other memory will be freed in ptp_clock_release(). En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ptp: solucione una posible pérdida de memoria en ptp_clock_register() Obtuve una pérdida de memoria de la siguiente manera al realizar la prueba de inyección de fallas: objeto sin referencia 0xffff88800906c618 (tamaño 8): comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (edad 13,188 s) volcado hexadecimal (primeros 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0 [<0000 000079f6e2ff>] kvasprintf+0xb5 /0x150 [<0000000026aae54f>] kvasprintf_const+0x60/0x190 [<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150 [<000000004e35abdd>] dev_set_name+0xc0/0x100 0000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp] [<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] Cuando posix_clock_register() devuelve un error, el nombre asignado en dev_set_name() se filtrará, se debe usar put_device() para renunciar a la referencia del dispositivo, luego el nombre se liberará kobject_cleanup() y otra memoria se liberarán en ptp_clock_release(). • https://git.kernel.org/stable/c/a33121e5487b424339636b25c35d3a180eaa5f5e https://git.kernel.org/stable/c/5230ef61882d2d14deb846eb6b48370694816e4c https://git.kernel.org/stable/c/6f5e3bb7879ee1eb71c6c3cbaaffbb0da6cd7d57 https://git.kernel.org/stable/c/89e8fc989feaac00bf1a7f9a766289422e2f5768 https://git.kernel.org/stable/c/2dece4d6d13fe179ee3a5991811712725a56e2f7 https://git.kernel.org/stable/c/0393b8720128d5b39db8523e5bfbfc689f18c37c https://git.kernel.org/stable/c/bfa2e0cd3dfda64fde43c3dca3aeba298d2fe7ad https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a10 •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2021-47452 – netfilter: nf_tables: skip netdev events generated on netns removal
https://notcve.org/view.php?id=CVE-2021-47452
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: skip netdev events generated on netns removal syzbot reported following (harmless) WARN: WARNING: CPU: 1 PID: 2648 at net/netfilter/core.c:468 nft_netdev_unregister_hooks net/netfilter/nf_tables_api.c:230 [inline] nf_tables_unregister_hook include/net/netfilter/nf_tables.h:1090 [inline] __nft_release_basechain+0x138/0x640 net/netfilter/nf_tables_api.c:9524 nft_netdev_event net/netfilter/nft_chain_filter.c:351 [inline] nf_tables_netdev_event+0x521/0x8a0 net/netfilter/nft_chain_filter.c:382 reproducer: unshare -n bash -c 'ip link add br0 type bridge; nft add table netdev t ; \ nft add chain netdev t ingress \{ type filter hook ingress device "br0" \ priority 0\; policy drop\; \}' Problem is that when netns device exit hooks create the UNREGISTER event, the .pre_exit hook for nf_tables core has already removed the base hook. Notifier attempts to do this again. The need to do base hook unregister unconditionally was needed in the past, because notifier was last stage where reg->dev dereference was safe. Now that nf_tables does the hook removal in .pre_exit, this isn't needed anymore. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: omitir eventos de netdev generados al eliminar netns syzbot informó lo siguiente (inofensivo) ADVERTENCIA: ADVERTENCIA: CPU: 1 PID: 2648 en net/netfilter/core.c:468 nft_netdev_unregister_hooks net/netfilter/nf_tables_api.c:230 [en línea] nf_tables_unregister_hook include/net/netfilter/nf_tables.h:1090 [en línea] __nft_release_basechain+0x138/0x640 net/netfilter/nf_tables_api.c:9524 nft_netdev_event net/netfilter/nft_ filtro_cadena.c: 351 [en línea] nf_tables_netdev_event+0x521/0x8a0 net/netfilter/nft_chain_filter.c:382 reproductor: dejar de compartir -n bash -c 'ip link agregar puente tipo br0; nft agregar tabla netdev t; \ nft add chain netdev t ingress \{ tipo filtro gancho ingreso dispositivo "br0" \ prioridad 0\; caída de la política\; \}' El problema es que cuando los ganchos de salida del dispositivo netns crean el evento UNREGISTER, el gancho .pre_exit para nf_tables core ya ha eliminado el gancho base. Notifier intenta hacer esto nuevamente. La necesidad de cancelar el registro del enlace base incondicionalmente era necesaria en el pasado, porque el notificador era la última etapa donde la desreferencia reg->dev era segura. • https://git.kernel.org/stable/c/767d1216bff82507c945e92fe719dff2083bb2f4 https://git.kernel.org/stable/c/b110391d1e806167254d3c7ae5d637191d913175 https://git.kernel.org/stable/c/0a0e5d47670b753d3dbf88f3c77a97a30864d9bd https://git.kernel.org/stable/c/90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f https://git.kernel.org/stable/c/68a3765c659f809dcaac20030853a054646eb739 •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2021-47451 – netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value
https://notcve.org/view.php?id=CVE-2021-47451
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value Currently, when the rule related to IDLETIMER is added, idletimer_tg timer structure is initialized by kmalloc on executing idletimer_tg_create function. However, in this process timer->timer_type is not defined to a specific value. Thus, timer->timer_type has garbage value and it occurs kernel panic. So, this commit fixes the panic by initializing timer->timer_type using kzalloc instead of kmalloc. Test commands: # iptables -A OUTPUT -j IDLETIMER --timeout 1 --label test $ cat /sys/class/xt_idletimer/timers/test Killed Splat looks like: BUG: KASAN: user-memory-access in alarm_expires_remaining+0x49/0x70 Read of size 8 at addr 0000002e8c7bc4c8 by task cat/917 CPU: 12 PID: 917 Comm: cat Not tainted 5.14.0+ #3 79940a339f71eb14fc81aee1757a20d5bf13eb0e Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: dump_stack_lvl+0x6e/0x9c kasan_report.cold+0x112/0x117 ? alarm_expires_remaining+0x49/0x70 __asan_load8+0x86/0xb0 alarm_expires_remaining+0x49/0x70 idletimer_tg_show+0xe5/0x19b [xt_IDLETIMER 11219304af9316a21bee5ba9d58f76a6b9bccc6d] dev_attr_show+0x3c/0x60 sysfs_kf_seq_show+0x11d/0x1f0 ? • https://git.kernel.org/stable/c/68983a354a655c35d3fb204489d383a2a051fda7 https://git.kernel.org/stable/c/2a670c323055282c9b72794a491d53cef86bbeaf https://git.kernel.org/stable/c/cae7cab804c943d723d52724a3aeb07a3f4a2650 https://git.kernel.org/stable/c/902c0b1887522a099aa4e1e6b4b476c2fe5dd13e •