CVE-2021-46956
Vulnerability from cvelistv5
Published
2024-02-27 18:46
Modified
2024-08-04 05:17
Severity
Summary
virtiofs: fix memory leak in virtio_fs_probe()
References
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirtiofs: fix memory leak in virtio_fs_probe()\n\nWhen accidentally passing twice the same tag to qemu, kmemleak ended up\nreporting a memory leak in virtiofs. Also, looking at the log I saw the\nfollowing error (that\u0027s when I realised the duplicated tag):\n\n virtiofs: probe of virtio5 failed with error -17\n\nHere\u0027s the kmemleak log for reference:\n\nunreferenced object 0xffff888103d47800 (size 1024):\n comm \"systemd-udevd\", pid 118, jiffies 4294893780 (age 18.340s)\n hex dump (first 32 bytes):\n 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........\n ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................\n backtrace:\n [\u003c000000000ebb87c1\u003e] virtio_fs_probe+0x171/0x7ae [virtiofs]\n [\u003c00000000f8aca419\u003e] virtio_dev_probe+0x15f/0x210\n [\u003c000000004d6baf3c\u003e] really_probe+0xea/0x430\n [\u003c00000000a6ceeac8\u003e] device_driver_attach+0xa8/0xb0\n [\u003c00000000196f47a7\u003e] __driver_attach+0x98/0x140\n [\u003c000000000b20601d\u003e] bus_for_each_dev+0x7b/0xc0\n [\u003c00000000399c7b7f\u003e] bus_add_driver+0x11b/0x1f0\n [\u003c0000000032b09ba7\u003e] driver_register+0x8f/0xe0\n [\u003c00000000cdd55998\u003e] 0xffffffffa002c013\n [\u003c000000000ea196a2\u003e] do_one_initcall+0x64/0x2e0\n [\u003c0000000008f727ce\u003e] do_init_module+0x5c/0x260\n [\u003c000000003cdedab6\u003e] __do_sys_finit_module+0xb5/0x120\n [\u003c00000000ad2f48c6\u003e] do_syscall_64+0x33/0x40\n [\u003c00000000809526b5\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae"
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-46956\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:06.717\",\"lastModified\":\"2024-02-28T14:06:45.783\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvirtiofs: fix memory leak in virtio_fs_probe()\\n\\nWhen accidentally passing twice the same tag to qemu, kmemleak ended up\\nreporting a memory leak in virtiofs. Also, looking at the log I saw the\\nfollowing error (that\u0027s when I realised the duplicated tag):\\n\\n virtiofs: probe of virtio5 failed with error -17\\n\\nHere\u0027s the kmemleak log for reference:\\n\\nunreferenced object 0xffff888103d47800 (size 1024):\\n comm \\\"systemd-udevd\\\", pid 118, jiffies 4294893780 (age 18.340s)\\n hex dump (first 32 bytes):\\n 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........\\n ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................\\n backtrace:\\n [\u003c000000000ebb87c1\u003e] virtio_fs_probe+0x171/0x7ae [virtiofs]\\n [\u003c00000000f8aca419\u003e] virtio_dev_probe+0x15f/0x210\\n [\u003c000000004d6baf3c\u003e] really_probe+0xea/0x430\\n [\u003c00000000a6ceeac8\u003e] device_driver_attach+0xa8/0xb0\\n [\u003c00000000196f47a7\u003e] __driver_attach+0x98/0x140\\n [\u003c000000000b20601d\u003e] bus_for_each_dev+0x7b/0xc0\\n [\u003c00000000399c7b7f\u003e] bus_add_driver+0x11b/0x1f0\\n [\u003c0000000032b09ba7\u003e] driver_register+0x8f/0xe0\\n [\u003c00000000cdd55998\u003e] 0xffffffffa002c013\\n [\u003c000000000ea196a2\u003e] do_one_initcall+0x64/0x2e0\\n [\u003c0000000008f727ce\u003e] do_init_module+0x5c/0x260\\n [\u003c000000003cdedab6\u003e] __do_sys_finit_module+0xb5/0x120\\n [\u003c00000000ad2f48c6\u003e] do_syscall_64+0x33/0x40\\n [\u003c00000000809526b5\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: virtiofs: corrige p\u00e9rdida de memoria en virtio_fs_probe() Al pasar accidentalmente dos veces la misma etiqueta a qemu, kmemleak termin\u00f3 reportando una p\u00e9rdida de memoria en virtiofs. Adem\u00e1s, mirando el registro vi el siguiente error (fue entonces cuando me di cuenta de la etiqueta duplicada): virtiofs: la sonda de virtio5 fall\u00f3 con el error -17 Aqu\u00ed est\u00e1 el registro kmemleak como referencia: objeto sin referencia 0xffff888103d47800 (tama\u00f1o 1024): comm \\\"systemd- udevd\\\", pid 118, jiffies 4294893780 (edad 18.340 s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 ......N....... ... ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................ rastreo: [\u0026lt;000000000ebb87c1\u0026gt;] virtio_fs_probe+0x171/0x7ae [virtiofs] [\u0026lt;00000000f8aca419\u0026gt;] virtio_dev_probe+0x15f/0x210 [\u0026lt;000000004d6baf3c\u0026gt;] very_probe+0xea/0x430 [\u0026lt;00000000a6ceeac8\u0026gt;] device_driver_attach+0xa8/0xb0 [\u0026lt;00000000196f47a7 \u0026gt;] __driver_attach+0x98/0x140 [\u0026lt;000000000b20601d\u0026gt;] bus_for_each_dev+0x7b/0xc0 [\u0026lt;00000000399c7b7f\u0026gt;] bus_add_driver+0x11b/0x1f0 [\u0026lt;0000000032b09ba7\u0026gt;] driver_register+0x8f/0xe0 [\u0026lt;00000000cdd55998\u0026gt;] 0xffffffffa002c013 [\u0026lt;000000000ea196a2\u0026gt; ] do_one_initcall+0x64/0x2e0 [\u0026lt;0000000008f727ce\u0026gt;] do_init_module+0x5c/0x260 [\u0026lt;000000003cdedab6\u0026gt; ] __do_sys_finit_module+0xb5/0x120 [\u0026lt;00000000ad2f48c6\u0026gt;] do_syscall_64+0x33/0x40 [\u0026lt;00000000809526b5\u0026gt;] Entry_SYSCALL_64_after_hwframe+0x44/0xae \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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