cve-2021-47506
Vulnerability from cvelistv5
Published
2024-05-24 15:01
Modified
2024-12-19 07:43
Severity ?
EPSS score ?
0.05% (0.12141)
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebce\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536ee\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.751Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47506\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-29T17:04:47.932390Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-29T17:04:53.070Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"nfsd: fix use-after-free due to delegation race\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": 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\"eeb0711801f5e19ef654371b627682aed3b11373\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"148c816f10fd11df27ca6a9b3238cdd42fa72cd3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\", \"lessThan\": \"548ec0805c399c65ed66c6641be467f717833ab5\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfs4state.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"4.4.296\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.294\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.259\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.222\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfs4state.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebce\"}, {\"url\": \"https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4\"}, {\"url\": \"https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536ee\"}, {\"url\": \"https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4\"}, {\"url\": \"https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09\"}, {\"url\": \"https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373\"}, {\"url\": \"https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3\"}, {\"url\": \"https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: fix use-after-free due to delegation race\\n\\nA delegation break could arrive as soon as we've called vfs_setlease.  A\\ndelegation break runs a callback which immediately (in\\nnfsd4_cb_recall_prepare) adds the delegation to del_recall_lru.  If we\\nthen exit nfs4_set_delegation without hashing the delegation, it will be\\nfreed as soon as the callback is done with it, without ever being\\nremoved from del_recall_lru.\\n\\nSymptoms show up later as use-after-free or list corruption warnings,\\nusually in the laundromat thread.\\n\\nI suspect aba2072f4523 \\\"nfsd: grant read delegations to clients holding\\nwrites\\\" made this bug easier to hit, but I looked as far back as v3.0\\nand it looks to me it already had the same problem.  So I'm not sure\\nwhere the bug was introduced; it may have been there from the beginning.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:43:46.365Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2021-47506\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:43:46.365Z\", \"dateReserved\": \"2024-05-22T06:20:56.205Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:01:52.746Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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