cve-2022-48762
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-12-19 08:07
Severity ?
6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: extable: fix load_unaligned_zeropad() reg indices In ex_handler_load_unaligned_zeropad() we erroneously extract the data and addr register indices from ex->type rather than ex->data. As ex->type will contain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4): * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is extracted from bits [9:5]. Thus, we may attempt to dereference an arbitrary address as X0 may hold an arbitrary value. * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary behaviour within load_unaligned_zeropad() and its caller. Fix this by extracting both values from ex->data as originally intended. On an MTE-enabled QEMU image we are hitting the following crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Call trace: fixup_exception+0xc4/0x108 __do_kernel_fault+0x3c/0x268 do_tag_check_fault+0x3c/0x104 do_mem_abort+0x44/0xf4 el1_abort+0x40/0x64 el1h_64_sync_handler+0x60/0xa0 el1h_64_sync+0x7c/0x80 link_path_walk+0x150/0x344 path_openat+0xa0/0x7dc do_filp_open+0xb8/0x168 do_sys_openat2+0x88/0x17c __arm64_sys_openat+0x74/0xa0 invoke_syscall+0x48/0x148 el0_svc_common+0xb8/0xf8 do_el0_svc+0x28/0x88 el0_svc+0x24/0x84 el0t_64_sync_handler+0x88/0xec el0t_64_sync+0x1b4/0x1b8 Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb
Impacted products
Vendor Product Version
Linux Linux Version: 5.16
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48762\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:14.287\",\"lastModified\":\"2024-11-21T07:33:58.220\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: extable: fix load_unaligned_zeropad() reg indices\\n\\nIn ex_handler_load_unaligned_zeropad() we erroneously extract the data and\\naddr register indices from ex-\u003etype rather than ex-\u003edata. As ex-\u003etype will\\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\\n * We\u0027ll always treat X0 as the address register, since EX_DATA_REG_ADDR is\\n   extracted from bits [9:5]. Thus, we may attempt to dereference an\\n   arbitrary address as X0 may hold an arbitrary value.\\n * We\u0027ll always treat X4 as the data register, since EX_DATA_REG_DATA is\\n   extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\\n   behaviour within load_unaligned_zeropad() and its caller.\\n\\nFix this by extracting both values from ex-\u003edata as originally intended.\\n\\nOn an MTE-enabled QEMU image we are hitting the following crash:\\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\\n Call trace:\\n  fixup_exception+0xc4/0x108\\n  __do_kernel_fault+0x3c/0x268\\n  do_tag_check_fault+0x3c/0x104\\n  do_mem_abort+0x44/0xf4\\n  el1_abort+0x40/0x64\\n  el1h_64_sync_handler+0x60/0xa0\\n  el1h_64_sync+0x7c/0x80\\n  link_path_walk+0x150/0x344\\n  path_openat+0xa0/0x7dc\\n  do_filp_open+0xb8/0x168\\n  do_sys_openat2+0x88/0x17c\\n  __arm64_sys_openat+0x74/0xa0\\n  invoke_syscall+0x48/0x148\\n  el0_svc_common+0xb8/0xf8\\n  do_el0_svc+0x28/0x88\\n  el0_svc+0x24/0x84\\n  el0t_64_sync_handler+0x88/0xec\\n  el0t_64_sync+0x1b4/0x1b8\\n Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: extable: corrige los \u00edndices de registro load_unaligned_zeropad() En ex_handler_load_unaligned_zeropad() extraemos err\u00f3neamente los datos y los \u00edndices de registro de direcciones de ex-\u0026gt;type en lugar de ex-\u0026gt;data. Como ex-\u0026gt;type contendr\u00e1 EX_TYPE_LOAD_UNALIGNED_ZEROPAD (es decir, 4): * Siempre trataremos a X0 como el registro de direcci\u00f3n, ya que EX_DATA_REG_ADDR se extrae de los bits [9:5]. Por lo tanto, podemos intentar eliminar la referencia a una direcci\u00f3n arbitraria ya que X0 puede tener un valor arbitrario. * Siempre trataremos a X4 como el registro de datos, ya que EX_DATA_REG_DATA se extrae de los bits [4:0]. Por lo tanto, corromperemos X4 y provocaremos un comportamiento arbitrario dentro de load_unaligned_zeropad() y su llamador. Solucione este problema extrayendo ambos valores de ex-\u0026gt;data como se pretend\u00eda originalmente. En una imagen QEMU habilitada para MTE, nos encontramos con el siguiente bloqueo: No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000 Rastreo de llamadas: fixup_exception+0xc4/0x108 __do_kernel_fault+0x3c/0x268 do_tag_check_fault+0x3c/0x104 do_mem_abort+0x44/0 xf4 el1_abort+ 0x40/0x64 el1h_64_sync_handler+0x60/0xa0 el1h_64_sync+0x7c/0x80 link_path_walk+0x150/0x344 path_openat+0xa0/0x7dc do_filp_open+0xb8/0x168 do_sys_openat2+0x88/0x17c __arm64_s ys_openat+0x74/0xa0 invoke_syscall+0x48/0x148 el0_svc_common+0xb8/0xf8 do_el0_svc+ 0x28/0x88 el0_svc+0x24/0x84 el0t_64_sync_handler+0x88/0xec el0t_64_sync+0x1b4/0x1b8 C\u00f3digo: f8695a69 71007d1f 540000e0 927df12a (f940014a)\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.2,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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