CVSS: -EPSS: 0%CPEs: 5EXPL: 0CVE-2024-36937 – xdp: use flags field to disambiguate broadcast redirect
https://notcve.org/view.php?id=CVE-2024-36937
In the Linux kernel, the following vulnerability has been resolved: xdp: use flags field to disambiguate broadcast redirect When redirecting a packet using XDP, the bpf_redirect_map() helper will set up the redirect destination information in struct bpf_redirect_info (using the __bpf_xdp_redirect_map() helper function), and the xdp_do_redirect() function will read this information after the XDP program returns and pass the frame on to the right redirect destination. When using the BPF_F_BROADCAST flag to do multicast redirect to a whole map, __bpf_xdp_redirect_map() sets the 'map' pointer in struct bpf_redirect_info to point to the destination map to be broadcast. And xdp_do_redirect() reacts to the value of this map pointer to decide whether it's dealing with a broadcast or a single-value redirect. However, if the destination map is being destroyed before xdp_do_redirect() is called, the map pointer will be cleared out (by bpf_clear_redirect_map()) without waiting for any XDP programs to stop running. This causes xdp_do_redirect() to think that the redirect was to a single target, but the target pointer is also NULL (since broadcast redirects don't have a single target), so this causes a crash when a NULL pointer is passed to dev_map_enqueue(). To fix this, change xdp_do_redirect() to react directly to the presence of the BPF_F_BROADCAST flag in the 'flags' value in struct bpf_redirect_info to disambiguate between a single-target and a broadcast redirect. And only read the 'map' pointer if the broadcast flag is set, aborting if that has been cleared out in the meantime. • https://git.kernel.org/stable/c/e624d4ed4aa8cc3c69d1359b0aaea539203ed266 https://git.kernel.org/stable/c/12481f30128fbebc2eeb55eb2d56390fdfa30c5e https://git.kernel.org/stable/c/272bfb019f3cc018f654b992115774e77b4f3ffc https://git.kernel.org/stable/c/e22e25820fa04ea5eaac4ef7ee200e9923f466a4 https://git.kernel.org/stable/c/6fd81f9d333e7b3532036577b1beb74ba1323553 https://git.kernel.org/stable/c/5bcf0dcbf9066348058b88a510c57f70f384c92c •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-36934 – bna: ensure the copied buf is NUL terminated
https://notcve.org/view.php?id=CVE-2024-36934
In the Linux kernel, the following vulnerability has been resolved: bna: ensure the copied buf is NUL terminated Currently, we allocate a nbytes-sized kernel buffer and copy nbytes from userspace to that buffer. Later, we use sscanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using sscanf. Fix this issue by using memdup_user_nul instead of memdup_user. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bna: asegúrese de que el buf copiado tenga terminación NUL. Actualmente, asignamos un búfer del kernel de tamaño nbytes y copiamos nbytes del espacio de usuario a ese búfer. • https://git.kernel.org/stable/c/7afc5dbde09104b023ce04465ba71aaba0fc4346 https://git.kernel.org/stable/c/bd502ba81cd1d515deddad7dbc6b812b14b97147 https://git.kernel.org/stable/c/80578ec10335bc15ac35fd1703c22aab34e39fdd https://git.kernel.org/stable/c/6f0f19b79c085cc891c418b768f26f7004bd51a4 https://git.kernel.org/stable/c/0f560240b4cc25d3de527deb257cdf072c0102a9 https://git.kernel.org/stable/c/06cb37e2ba6441888f24566a997481d4197b4e32 https://git.kernel.org/stable/c/e19478763154674c084defc62ae0d64d79657f91 https://git.kernel.org/stable/c/1518b2b498a0109eb6b15755169d3b660 •
CVSS: 5.9EPSS: 0%CPEs: 8EXPL: 0CVE-2024-36933 – nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment().
https://notcve.org/view.php?id=CVE-2024-36933
In the Linux kernel, the following vulnerability has been resolved: nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). syzbot triggered various splats (see [0] and links) by a crafted GSO packet of VIRTIO_NET_HDR_GSO_UDP layering the following protocols: ETH_P_8021AD + ETH_P_NSH + ETH_P_IPV6 + IPPROTO_UDP NSH can encapsulate IPv4, IPv6, Ethernet, NSH, and MPLS. As the inner protocol can be Ethernet, NSH GSO handler, nsh_gso_segment(), calls skb_mac_gso_segment() to invoke inner protocol GSO handlers. nsh_gso_segment() does the following for the original skb before calling skb_mac_gso_segment() 1. reset skb->network_header 2. save the original skb->{mac_heaeder,mac_len} in a local variable 3. pull the NSH header 4. resets skb->mac_header 5. set up skb->mac_len and skb->protocol for the inner protocol. and does the following for the segmented skb 6. set ntohs(ETH_P_NSH) to skb->protocol 7. push the NSH header 8. restore skb->mac_header 9. set skb->mac_header + mac_len to skb->network_header 10. restore skb->mac_len There are two problems in 6-7 and 8-9. (a) After 6 & 7, skb->data points to the NSH header, so the outer header (ETH_P_8021AD in this case) is stripped when skb is sent out of netdev. Also, if NSH is encapsulated by NSH + Ethernet (so NSH-Ethernet-NSH), skb_pull() in the first nsh_gso_segment() will make skb->data point to the middle of the outer NSH or Ethernet header because the Ethernet header is not pulled by the second nsh_gso_segment(). (b) While restoring skb->{mac_header,network_header} in 8 & 9, nsh_gso_segment() does not assume that the data in the linear buffer is shifted. However, udp6_ufo_fragment() could shift the data and change skb->mac_header accordingly as demonstrated by syzbot. If this happens, even the restored skb->mac_header points to the middle of the outer header. It seems nsh_gso_segment() has never worked with outer headers so far. At the end of nsh_gso_segment(), the outer header must be restored for the segmented skb, instead of the NSH header. To do that, let's calculate the outer header position relatively from the inner header and set skb->{data,mac_header,protocol} properly. [0]: BUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline] BUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline] BUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline] ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563 __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x735/0xa10 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: slab_post_alloc_hook mm/slub.c:3819 [inline] slab_alloc_node mm/slub.c:3860 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001 kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582 __ ---truncated--- En el kernel de Linux, se resolvió la siguiente vulnerabilidad: nsh: restaurar skb->{protocol,data,mac_header} para el encabezado externo en nsh_gso_segment(). syzbot activó varios símbolos (ver [0] y enlaces) mediante un paquete GSO manipulado de VIRTIO_NET_HDR_GSO_UDP que superpone los siguientes protocolos: ETH_P_8021AD + ETH_P_NSH + ETH_P_IPV6 + IPPROTO_UDP NSH puede encapsular IPv4, IPv6, Ethernet, NSH y MPLS. Como el protocolo interno puede ser Ethernet, el controlador NSH GSO, nsh_gso_segment(), llama a skb_mac_gso_segment() para invocar los controladores GSO del protocolo interno. nsh_gso_segment() hace lo siguiente para el skb original antes de llamar a skb_mac_gso_segment() 1. restablecer skb->network_header 2. guardar el skb->{mac_heaeder,mac_len} original en una variable local 3. extraer el encabezado NSH 4. restablece skb- >mac_header 5. Configure skb->mac_len y skb->protocol para el protocolo interno. y hace lo siguiente para el skb segmentado 6. configurar ntohs(ETH_P_NSH) en skb->protocol 7. empujar el encabezado NSH 8. restaurar skb->mac_header 9. configurar skb->mac_header + mac_len en skb->network_header 10. restaurar skb->mac_len Hay dos problemas en 6-7 y 8-9. (a) Después de 6 y 7, skb->data apunta al encabezado NSH, por lo que el encabezado externo (ETH_P_8021AD en este caso) se elimina cuando skb se envía fuera de netdev. • https://git.kernel.org/stable/c/c411ed854584a71b0e86ac3019b60e4789d88086 https://git.kernel.org/stable/c/a7c2c3c1caabcb4a3d6c47284c397507aaf54fe9 https://git.kernel.org/stable/c/46134031c20fd313d03b90169d64b2e05ca6b65c https://git.kernel.org/stable/c/bbccf0caef2fa917d6d0692385a06ce3c262a216 https://git.kernel.org/stable/c/5a4603fbc285752d19e4b415466db18ef3617e4a https://git.kernel.org/stable/c/37ed6f244ec5bda2e90b085084e322ea55d0aaa2 https://git.kernel.org/stable/c/696d18bb59727a2e0526c0802a812620be1c9340 https://git.kernel.org/stable/c/29a07f2ee4d273760c2acbfc756e29ecc • CWE-457: Use of Uninitialized Variable •
CVSS: -EPSS: 0%CPEs: 5EXPL: 0CVE-2024-36931 – s390/cio: Ensure the copied buf is NUL terminated
https://notcve.org/view.php?id=CVE-2024-36931
In the Linux kernel, the following vulnerability has been resolved: s390/cio: Ensure the copied buf is NUL terminated Currently, we allocate a lbuf-sized kernel buffer and copy lbuf from userspace to that buffer. Later, we use scanf on this buffer but we don't ensure that the string is terminated inside the buffer, this can lead to OOB read when using scanf. Fix this issue by using memdup_user_nul instead. En el kernel de Linux, se resolvió la siguiente vulnerabilidad: s390/cio: asegúrese de que el buf copiado tenga terminación NUL. Actualmente, asignamos un búfer del kernel del tamaño de lbuf y copiamos lbuf del espacio de usuario a ese búfer. • https://git.kernel.org/stable/c/a4f17cc726712a52122ad38540bc3ff3a052d1a4 https://git.kernel.org/stable/c/c9d48ce163305595ae20aee27774192476d5e6a5 https://git.kernel.org/stable/c/10452edd175fcc4fd0f5ac782ed2a002e3e5d65c https://git.kernel.org/stable/c/84b38f48836662c4bfae646c014f4e981e16a2b2 https://git.kernel.org/stable/c/06759ebaf75c19c87b2453a5e130e9e61e9b5d65 https://git.kernel.org/stable/c/da7c622cddd4fe36be69ca61e8c42e43cde94784 •
CVSS: 5.5EPSS: 0%CPEs: 4EXPL: 0CVE-2024-36930 – spi: fix null pointer dereference within spi_sync
https://notcve.org/view.php?id=CVE-2024-36930
In the Linux kernel, the following vulnerability has been resolved: spi: fix null pointer dereference within spi_sync If spi_sync() is called with the non-empty queue and the same spi_message is then reused, the complete callback for the message remains set while the context is cleared, leading to a null pointer dereference when the callback is invoked from spi_finalize_current_message(). With function inlining disabled, the call stack might look like this: _raw_spin_lock_irqsave from complete_with_flags+0x18/0x58 complete_with_flags from spi_complete+0x8/0xc spi_complete from spi_finalize_current_message+0xec/0x184 spi_finalize_current_message from spi_transfer_one_message+0x2a8/0x474 spi_transfer_one_message from __spi_pump_transfer_message+0x104/0x230 __spi_pump_transfer_message from __spi_transfer_message_noqueue+0x30/0xc4 __spi_transfer_message_noqueue from __spi_sync+0x204/0x248 __spi_sync from spi_sync+0x24/0x3c spi_sync from mcp251xfd_regmap_crc_read+0x124/0x28c [mcp251xfd] mcp251xfd_regmap_crc_read [mcp251xfd] from _regmap_raw_read+0xf8/0x154 _regmap_raw_read from _regmap_bus_read+0x44/0x70 _regmap_bus_read from _regmap_read+0x60/0xd8 _regmap_read from regmap_read+0x3c/0x5c regmap_read from mcp251xfd_alloc_can_err_skb+0x1c/0x54 [mcp251xfd] mcp251xfd_alloc_can_err_skb [mcp251xfd] from mcp251xfd_irq+0x194/0xe70 [mcp251xfd] mcp251xfd_irq [mcp251xfd] from irq_thread_fn+0x1c/0x78 irq_thread_fn from irq_thread+0x118/0x1f4 irq_thread from kthread+0xd8/0xf4 kthread from ret_from_fork+0x14/0x28 Fix this by also setting message->complete to NULL when the transfer is complete. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: corrige la desreferencia del puntero nulo dentro de spi_sync Si se llama a spi_sync() con la cola no vacía y luego se reutiliza el mismo spi_message, la devolución de llamada completa para el mensaje permanece configurada mientras el el contexto se borra, lo que lleva a una desreferencia del puntero nulo cuando se invoca la devolución de llamada desde spi_finalize_current_message(). Con la función incorporada deshabilitada, la pila de llamadas podría verse así: _raw_spin_lock_irqsave from complete_with_flags+0x18/0x58 complete_with_flags from spi_complete+0x8/0xc spi_complete from spi_finalize_current_message+0xec/0x184 spi_finalize_current_message from spi_transfer_one_message+0x2 a8/0x474 spi_transfer_one_message de __spi_pump_transfer_message+0x104/0x230 __spi_pump_transfer_message de __spi_transfer_message_noqueue+0x30/0xc4 __spi_transfer_message_noqueue de __spi_sync+0x204/0x248 __spi_sync de spi_sync+0x24/0x3c spi_sync de mcp251xfd_regmap_crc_read+0x124/0x28c fd] mcp251xfd_regmap_crc_read [mcp251xfd] de _regmap_raw_read+0xf8/0x154 _regmap_raw_read de _regmap_bus_read+0x44/0x70 _regmap_bus_read de _regmap_read+ 0x60/0xd8 _regmap_read de regmap_read+0x3c/0x5c regmap_read de mcp251xfd_alloc_can_err_skb+0x1c/0x54 [mcp251xfd] mcp251xfd_alloc_can_err_skb [mcp251xfd] de mcp251xfd_irq+0x19 4/0xe70 [mcp251xfd] mcp251xfd_irq [mcp251xfd] de irq_thread_fn+0x1c/0x78 irq_thread_fn de irq_thread+0x118/0x1f4 irq_thread de kthread+0xd8/0xf4 kthread de ret_from_fork+0x14/0x28 Solucione este problema configurando también mensaje->completo en NULL cuando se complete la transferencia. • https://git.kernel.org/stable/c/ae7d2346dc89ae89a6e0aabe6037591a11e593c0 https://git.kernel.org/stable/c/e005d6754e3e440257006795b687c4ad8733b493 https://git.kernel.org/stable/c/a30659f1576d2c8e62e7426232bb18b885fd951a https://git.kernel.org/stable/c/2070d008cc08bff50a58f0f4d30f12d3ebf94c00 https://git.kernel.org/stable/c/4756fa529b2f12b7cb8f21fe229b0f6f47190829 https://access.redhat.com/security/cve/CVE-2024-36930 https://bugzilla.redhat.com/show_bug.cgi?id=2284494 • CWE-476: NULL Pointer Dereference •