CVE-2026-98079

{"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.3"}]}]}], "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", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/btrfs/zstd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "14d982762945d9945c60bbd48b77df194dd8e28d", "status": "affected", "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96", "versionType": "git"}, {"lessThan": "844603cf842ee67640d33f350e3fa60f3de7fad3", "status": "affected", "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96", "versionType": "git"}, {"lessThan": "d8f57049521948df5f50797141472fbbed3b0723", "status": "affected", "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96", "versionType": "git"}, {"lessThan": "0de9f31d447ae71ab08c7850a321682f8d2907c3", "status": "affected", "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96", "versionType": "git"}, {"lessThan": "2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7", "status": "affected", "version": "3f93aef535c8ea03e40cd8acf0753b3e6ed33e96", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/btrfs/zstd.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-98079", "lastModified": "2026-10-21T13:21:21.620", "metrics": {}, "published": "2026-09-25T11:17:37.307", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0de9f31d447ae71ab08c7850a321682f8d2907c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/14d982762945d9945c60bbd48b77df194dd8e28d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/844603cf842ee67640d33f350e3fa60f3de7fad3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d8f57049521948df5f50797141472fbbed3b0723"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f93aef535c8ea03e40cd8acf0753b3e6ed33e96,d8f57049521948df5f50797141472fbbed3b0723)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f93aef535c8ea03e40cd8acf0753b3e6ed33e96,0de9f31d447ae71ab08c7850a321682f8d2907c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f93aef535c8ea03e40cd8acf0753b3e6ed33e96,2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:45:19.067928+00:00", "updated": "2026-09-26T14:15:09.567176+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-632"]}