cve-2021-46956
Vulnerability from cvelistv5
Published
2024-02-27 18:46
Modified
2024-12-19 07:32
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
virtiofs: fix memory leak in virtio_fs_probe()
When accidentally passing twice the same tag to qemu, kmemleak ended up
reporting a memory leak in virtiofs. Also, looking at the log I saw the
following error (that's when I realised the duplicated tag):
virtiofs: probe of virtio5 failed with error -17
Here's the kmemleak log for reference:
unreferenced object 0xffff888103d47800 (size 1024):
comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s)
hex dump (first 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 ................
backtrace:
[<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs]
[<00000000f8aca419>] virtio_dev_probe+0x15f/0x210
[<000000004d6baf3c>] really_probe+0xea/0x430
[<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0
[<00000000196f47a7>] __driver_attach+0x98/0x140
[<000000000b20601d>] bus_for_each_dev+0x7b/0xc0
[<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0
[<0000000032b09ba7>] driver_register+0x8f/0xe0
[<00000000cdd55998>] 0xffffffffa002c013
[<000000000ea196a2>] do_one_initcall+0x64/0x2e0
[<0000000008f727ce>] do_init_module+0x5c/0x260
[<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120
[<00000000ad2f48c6>] do_syscall_64+0x33/0x40
[<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: a62a8ef9d97da23762a588592c8b8eb50a8deb6a Version: a62a8ef9d97da23762a588592c8b8eb50a8deb6a Version: a62a8ef9d97da23762a588592c8b8eb50a8deb6a Version: a62a8ef9d97da23762a588592c8b8eb50a8deb6a Version: a62a8ef9d97da23762a588592c8b8eb50a8deb6a |
||||||
|
|||||||||
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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\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4\",\"versionEndExcluding\":\"5.4.118\",\"matchCriteriaId\":\"45C90F78-15A8-452F-AA7D-00A762FDEFE7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.36\",\"matchCriteriaId\":\"003E22D0-CA29-4338-8B35-0754C740074F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.11.20\",\"matchCriteriaId\":\"EEC03413-9760-46D4-AC1D-EB084A1D4111\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.3\",\"matchCriteriaId\":\"F9D6B2DE-7E4A-4B3B-9AEE-3A2C5F23DA32\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:42.907Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46956\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-02-27T19:29:39.801497Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-05T15:20:40.997Z\"}}], \"cna\": {\"title\": \"virtiofs: fix memory leak in virtio_fs_probe()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"a62a8ef9d97da23762a588592c8b8eb50a8deb6a\", \"lessThan\": \"310efc95c72c13faf855c692d19cd4d054d827c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a62a8ef9d97da23762a588592c8b8eb50a8deb6a\", \"lessThan\": \"d19555ff225d0896a33246a49279e6d578095f15\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a62a8ef9d97da23762a588592c8b8eb50a8deb6a\", \"lessThan\": \"9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a62a8ef9d97da23762a588592c8b8eb50a8deb6a\", \"lessThan\": \"5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"a62a8ef9d97da23762a588592c8b8eb50a8deb6a\", \"lessThan\": \"c79c5e0178922a9e092ec8fed026750f39dcaef4\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/fuse/virtio_fs.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.118\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/fuse/virtio_fs.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8\"}, {\"url\": \"https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15\"}, {\"url\": \"https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae\"}, {\"url\": \"https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6\"}, {\"url\": \"https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"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\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:32:30.946Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-46956\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:32:30.946Z\", \"dateReserved\": \"2024-02-27T18:42:55.937Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:46:58.101Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.