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CVE-2021-46956 (GCVE-0-2021-46956)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:46 – Updated: 2026-05-11 13:45
VLAI
Title
virtiofs: fix memory leak in virtio_fs_probe()
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
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-27 19:29 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a62a8ef9d97da23762a588592c8b8eb50a8deb6a , < 310efc95c72c13faf855c692d19cd4d054d827c8 (git)
Affected: a62a8ef9d97da23762a588592c8b8eb50a8deb6a , < d19555ff225d0896a33246a49279e6d578095f15 (git)
Affected: a62a8ef9d97da23762a588592c8b8eb50a8deb6a , < 9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae (git)
Affected: a62a8ef9d97da23762a588592c8b8eb50a8deb6a , < 5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 (git)
Affected: a62a8ef9d97da23762a588592c8b8eb50a8deb6a , < c79c5e0178922a9e092ec8fed026750f39dcaef4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46956\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:06.717\",\"lastModified\":\"2026-06-17T04:15:58.590\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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 \"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/fuse/virtio_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/fuse/virtio_fs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.118\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.36\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.11.20\",\"lessThanOrEqual\":\"5.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.12.3\",\"lessThanOrEqual\":\"5.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-02-27T19:29:39.801497Z\",\"id\":\"CVE-2021-46956\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"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\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:17:46+00:00",
      "cve": "CVE-2021-46956",
      "id": "CVE-2021-46956",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: virtiofs: fix memory leak in virtio_fs_probe()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-46956.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:58:44Z",
      "cve": "CVE-2021-46956",
      "id": "CVE-2021-46956",
      "initial_release_date": "2024-02-29T03:56:34Z",
      "product_status:known_affected": "388",
      "product_status:known_not_affected": "333",
      "product_status:recommended": "91",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-46956",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-46956.json",
      "version": "40"
    },
    "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-1.2.0\"}, \"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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.118\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:45:10.978Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46956\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:45:10.978Z\", \"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": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.