{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98079",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:19:56.074Z",
        "datePublished": "2026-09-25T10:24:16.892Z",
        "dateUpdated": "2026-10-21T12:54:23.769Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-21T12:54:23.769Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zstd: fix lost wakeup when waiting for a workspace\n\nA writer can sleep forever in zstd_get_workspace() even though a workspace\nis free.  When zstd_alloc_workspace() fails, the task is queued on\nzwsm->wait and schedules unconditionally, never re-testing the pool.\nzstd_put_workspace() publishes the workspace and then calls cond_wake_up(),\nwhich only wakes when a sleeper is already visible, so a workspace returned\nbetween the failed allocation and prepare_to_wait() wakes nobody.  The\nwindow is wide: zstd_alloc_workspace() goes through kvmalloc() and may\nenter reclaim.\n\nOnly a max level workspace triggers the wakeup and one is deliberately kept\nallocated as the fallback every waiter waits for, so once its wakeup is\nlost the writer stays in TASK_UNINTERRUPTIBLE until some other task happens\nto return one.  Re-check the pool after prepare_to_wait() has published the\nwaiter, and use the workspace if one turned up."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/zstd.c"
                    ],
                    "versions": [
                        {
                            "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96",
                            "lessThan": "14d982762945d9945c60bbd48b77df194dd8e28d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96",
                            "lessThan": "844603cf842ee67640d33f350e3fa60f3de7fad3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96",
                            "lessThan": "d8f57049521948df5f50797141472fbbed3b0723",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96",
                            "lessThan": "0de9f31d447ae71ab08c7850a321682f8d2907c3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96",
                            "lessThan": "2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/btrfs/zstd.c"
                    ],
                    "versions": [
                        {
                            "version": "5.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.114",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.7",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "6.6.160"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "6.12.114"
                                },
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                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "6.18.53"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
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                                },
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                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "7.3"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/14d982762945d9945c60bbd48b77df194dd8e28d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/844603cf842ee67640d33f350e3fa60f3de7fad3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d8f57049521948df5f50797141472fbbed3b0723"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0de9f31d447ae71ab08c7850a321682f8d2907c3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7"
                }
            ],
            "title": "btrfs: zstd: fix lost wakeup when waiting for a workspace",
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                "engine": "bippy-1.2.0"
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    }
}