CVSS: 5.5EPSS: 0%CPEs: 4EXPL: 0CVE-2024-36936 – efi/unaccepted: touch soft lockup during memory accept
https://notcve.org/view.php?id=CVE-2024-36936
In the Linux kernel, the following vulnerability has been resolved: efi/unaccepted: touch soft lockup during memory accept Commit 50e782a86c98 ("efi/unaccepted: Fix soft lockups caused by parallel memory acceptance") has released the spinlock so other CPUs can do memory acceptance in parallel and not triggers softlockup on other CPUs. However the softlock up was intermittent shown up if the memory of the TD guest is large, and the timeout of softlockup is set to 1 second: RIP: 0010:_raw_spin_unlock_irqrestore Call Trace: ? __hrtimer_run_queues <IRQ> ? hrtimer_interrupt ? watchdog_timer_fn ? __sysvec_apic_timer_interrupt ? • https://git.kernel.org/stable/c/50e782a86c980d4f8292ef82ed8139282ca07a98 https://git.kernel.org/stable/c/b583bfcc5a36dbd1db1984dbfcfd23ba64d23604 https://git.kernel.org/stable/c/e115c1b5de55a105c75aba8eb08301c075fa4ef4 https://git.kernel.org/stable/c/781e34b736014188ba9e46a71535237313dcda81 https://git.kernel.org/stable/c/1c5a1627f48105cbab81d25ec2f72232bfaa8185 https://access.redhat.com/security/cve/CVE-2024-36936 https://bugzilla.redhat.com/show_bug.cgi?id=2296278 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-36935 – ice: ensure the copied buf is NUL terminated
https://notcve.org/view.php?id=CVE-2024-36935
In the Linux kernel, the following vulnerability has been resolved: ice: ensure the copied buf is NUL terminated Currently, we allocate a count-sized kernel buffer and copy count bytes 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 resolvió la siguiente vulnerabilidad: ice: asegúrese de que el buf copiado tenga terminación NUL. Actualmente, asignamos un búfer del kernel del tamaño de un conteo y copiamos el conteo de bytes del espacio de usuario a ese búfer. • https://git.kernel.org/stable/c/96a9a9341cdaea0c3bce4c134e04a2a42ae899ac https://git.kernel.org/stable/c/5ff4de981983ed84f29b5d92b6550ec054e12a92 https://git.kernel.org/stable/c/666854ea9cad844f75a068f32812a2d78004914a •
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: 5.5EPSS: 0%CPEs: 2EXPL: 0CVE-2024-36932 – thermal/debugfs: Prevent use-after-free from occurring after cdev removal
https://notcve.org/view.php?id=CVE-2024-36932
In the Linux kernel, the following vulnerability has been resolved: thermal/debugfs: Prevent use-after-free from occurring after cdev removal Since thermal_debug_cdev_remove() does not run under cdev->lock, it can run in parallel with thermal_debug_cdev_state_update() and it may free the struct thermal_debugfs object used by the latter after it has been checked against NULL. If that happens, thermal_debug_cdev_state_update() will access memory that has been freed already causing the kernel to crash. Address this by using cdev->lock in thermal_debug_cdev_remove() around the cdev->debugfs value check (in case the same cdev is removed at the same time in two different threads) and its reset to NULL. Cc :6.8+ <stable@vger.kernel.org> # 6.8+ En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Thermal/debugfs: evita que se produzca use after free después de la eliminación de cdev. Dado que Thermal_debug_cdev_remove() no se ejecuta bajo cdev->lock, puede ejecutarse en paralelo con Thermal_debug_cdev_state_update() y puede liberar el objeto struct Thermal_debugfs utilizado por este último después de haberlo verificado con NULL. Si eso sucede, Thermal_debug_cdev_state_update() accederá a la memoria que ya ha sido liberada, lo que provocará que el kernel falle. Solucione esto usando cdev->lock en Thermal_debug_cdev_remove() alrededor de la verificación del valor de cdev->debugfs (en caso de que el mismo cdev se elimine al mismo tiempo en dos subprocesos diferentes) y se restablezca a NULL. CC :6.8+ # 6.8+ • https://git.kernel.org/stable/c/755113d7678681a137c330f7997ceb680adb644e https://git.kernel.org/stable/c/c1279dee33369e2525f532364bb87207d23b9481 https://git.kernel.org/stable/c/d351eb0ab04c3e8109895fc33250cebbce9c11da https://access.redhat.com/security/cve/CVE-2024-36932 https://bugzilla.redhat.com/show_bug.cgi?id=2284490 • CWE-416: Use After Free •