Vulnerabilidad en kernel de Linux (CVE-2022-48640)

En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: bonding: corrige la deref NULL en bond_rr_gen_slave_id Se corrige una desreferencia NULL del miembro struct bonding.rr_tx_counter porque si un enlace se crea inicialmente con un modo inicial != cero (Round Robin) la memoria requerido para el contador nunca se crea y cuando se cambia el modo nunca se intenta verificar que la memoria esté asignada al cambiar de modo. Esto provoca los siguientes errores en una máquina aarch64: [334.686773] No se puede manejar la solicitud de paginación del kernel en la dirección virtual ffff2c91ac905000 [334.694703] Información de cancelación de memoria: [334.697486] ESR = 0x0000000096000004 [334.701234] EC = 0x25: DABT (EL actual), IL = 32 bits [ 334.706536] SET = 0, FnV = 0 [ 334.709579] EA = 0, S1PTW = 0 [ 334.712719] FSC = 0x04: error de traducción de nivel 0 [ 334.717586] Información de cancelación de datos: [ 334.720454] ISV = 0, ISS = 0x00000004 [334.724288] CM = 0, WnR = 0 [334.727244] tabla de intercambio: páginas 4k, VA de 48 bits, pgdp=000008044d662000 [334.733944] [ffff2c91ac905000] 0000000000000, p4d=00000000000000000 [334.740734] Error interno: Ups: 96000004 [#1] SMP [334.745602] Módulos vinculados en: unión tls veth rfkill sunrpc arm_spe_pmu vfat fat acpi_ipmi ipmi_ssif ixgbe igb i40e mdio ipmi_devintf ipmi_msghandler arm_cmn arm_dsu_pmu cppc_cpufreq acpi_tad fuse crct10dif_ce ast ghash_ce sbsa_gwdt nvme drm_vram_helper drm_ttm_helper nvme_core ttm xgene_hwmon [334.772217] CPU: 7 PID: 2214 Comm: ping No contaminado 6.0.0-rc4-00133-g64ae13ed4784 #4 [334.779950] Nombre de hardware: GIGABYTE R272-P31-00/MP32-AR1-00, BIOS F18v (SCP: 1.08.20211002) 12/01 /2021 [ 334.789244] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 334.796196] pc : bond_rr_gen_slave_id+0x40/0x124 [unión] [ 334.801691] lr : _slave_get+0x38/0xdc [ vinculación] [ 334.807962] sp : ffff8000221733e0 [ 334.811265] x29: ffff8000221733e0 x28: ffffdbac8572d198 x27: ffff80002217357c [ 334.818392] x26: 00000000002a x25: ffffdbacb33ee000 x24: ffff07ff980fa000 [ 334.825519] x23: ffffdbacb2e398ba x22: ffff07ff98102000 x21: ffff07ff981029c0 [ 334.832646] x 20: 0000000000000001 x19: ffff07ff981029c0 x18: 0000000000000014 [ 334.839773] x17: 0000000000000000 x16: ffffdbacb1004364 x15: 0000aaaabe2f5a62 [ 334.846899] 14: ffff07ff8e55d968 x13: ffff07ff8e55db30 x12: 0000000000000000 [ 334.854026] x11: ffffdbacb21532e8 x10: 0000000000000001 x9 : ffffdbac857178ec [ 3 34.861153] x8: ffff07ff9f6e5a28 x7: 0000000000000000 x6: 000000007c2b3742 [334.868279] x5: ffff2c91ac905000 x4: ffff2c91ac905000 x3: ffff07ff9f554400 [334.875406] x2: 1ac905000 x1: 0000000000000001 x0: ffff07ff981029c0 [334.882532] Rastreo de llamadas: [334.884967] bond_rr_gen_slave_id+0x40/0x124 [vinculación] [334.890109] _obtener+ 0x38/0xdc [vínculo] [ 334.896033] __bond_start_xmit+0x128/0x3a0 [vínculo] [ 334.901001] bond_start_xmit+0x54/0xb0 [vínculo] [ 334.905622] dev_hard_start_xmit+0xb4/0x220 [ 334 .909798] __dev_queue_xmit+0x1a0/0x720 [ 334.913799] arp_xmit+0x3c /0xbc [ 334.916932] arp_send_dst+0x98/0xd0 [ 334.920410] arp_solicit+0xe8/0x230 [ 334.923888] neigh_probe+0x60/0xb0 [ 334.927279] 0x470 [334.931453] neigh_resolve_output+0x70/0x90 [334.935626] ip_finish_output2+0x158/0x514 [ 334.939714] __ip_finish_output+0xac/0x1a4 [ 334.943800] ip_finish_output+0x40/0xfc [ 334.947626] ip_output+0xf8/0x1a4 [ 334.950931] 0 [ 334.954410] ip_push_pending_frames+0x3c/0x60 [ 334.958758] raw_sendmsg+0x458/0x6d0 [ 334.962325 ] inet_sendmsg+0x50/0x80 [ 334.965805] sock_sendmsg+0x60/0x6c [ 334.969286] __sys_sendto+0xc8/0x134 [ 334.972853] __arm64_sys_sendto+0x34/0x4c ncado---