cve-2022-48762
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-08-03 15:25
Severity ?
Summary
arm64: extable: fix load_unaligned_zeropad() reg indices
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "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)"
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    "cveId": "CVE-2022-48762",
    "datePublished": "2024-06-20T11:13:39.855Z",
    "dateReserved": "2024-06-20T11:09:39.060Z",
    "dateUpdated": "2024-08-03T15:25:01.535Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48762\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:14.287\",\"lastModified\":\"2024-06-20T12:43:25.663\",\"vulnStatus\":\"Awaiting Analysis\",\"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)\"}],\"metrics\":{},\"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\"}]}}"
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