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| { |
| "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." |
| } |
| ], |
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| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
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| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "fs/nfsd/nfs4state.c" |
| ], |
| "versions": [ |
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| "status": "affected" |
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| { |
| "version": "0", |
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| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.4.296", |
| "lessThanOrEqual": "4.4.*", |
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| { |
| "version": "4.14.259", |
| "lessThanOrEqual": "4.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.222", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.168", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.85", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.15.8", |
| "lessThanOrEqual": "5.15.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.16", |
| "lessThanOrEqual": "*", |
| "status": "unaffected", |
| "versionType": "original_commit_for_fix" |
| } |
| ] |
| } |
| ], |
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| "nodes": [ |
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| "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" |
| } |
| ], |
| "title": "nfsd: fix use-after-free due to delegation race", |
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| } |
| } |
| }, |
| "cveMetadata": { |
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| "cveID": "CVE-2021-47506", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
