{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48921", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T06:06:23.295Z", "datePublished": "2024-08-22T01:32:53.131Z", "dateUpdated": "2026-05-23T15:21:05.775Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:21:05.775Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Fix fault in reweight_entity\n\nSyzbot found a GPF in reweight_entity. This has been bisected to\ncommit 4ef0c5c6b5ba (\"kernel/sched: Fix sched_fork() access an invalid\nsched_task_group\")\n\nThere is a race between sched_post_fork() and setpriority(PRIO_PGRP)\nwithin a thread group that causes a null-ptr-deref in\nreweight_entity() in CFS. The scenario is that the main process spawns\nnumber of new threads, which then call setpriority(PRIO_PGRP, 0, -20),\nwait, and exit. For each of the new threads the copy_process() gets\ninvoked, which adds the new task_struct and calls sched_post_fork()\nfor it.\n\nIn the above scenario there is a possibility that\nsetpriority(PRIO_PGRP) and set_one_prio() will be called for a thread\nin the group that is just being created by copy_process(), and for\nwhich the sched_post_fork() has not been executed yet. This will\ntrigger a null pointer dereference in reweight_entity(), as it will\ntry to access the run queue pointer, which hasn't been set.\n\nBefore the mentioned change the cfs_rq pointer for the task has been\nset in sched_fork(), which is called much earlier in copy_process(),\nbefore the new task is added to the thread_group. Now it is done in\nthe sched_post_fork(), which is called after that. To fix the issue\nthe remove the update_load param from the update_load param() function\nand call reweight_task() only if the task flag doesn't have the\nTASK_NEW flag set." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/core.c" ], "versions": [ { "version": "c85c6fadbef0a3eab41540ea628fa8fe8928c820", "lessThan": "8f317cd888059c59e2fa924bf4b0957cfa53f78e", "status": "affected", "versionType": "git" }, { "version": "3869eecf050416a1d19bac60926f6b5d64b0aa58", "lessThan": "e0bcd6b5779352aed88f2e538a82a39f1a7715bb", "status": "affected", "versionType": "git" }, { "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a", "lessThan": "589a954daab5e18399860b6c8ffaeaf79844eb20", "status": "affected", "versionType": "git" }, { "version": "4ef0c5c6b5ba1f38f0ea1cedad0cad722f00c14a", "lessThan": "13765de8148f71fa795e0a6607de37c49ea5915a", "status": "affected", "versionType": "git" }, { "version": "25d40b828fb855ee62e1039c65a666c9afd60786", "status": "affected", "versionType": "git" }, { "version": "5.10.80", "lessThan": "5.10.137", "status": "affected", "versionType": "semver" }, { "version": "5.15.3", "lessThan": "5.15.27", "status": "affected", "versionType": "semver" }, { "version": "5.14.19", "lessThan": "5.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/core.c" ], "versions": [ { "version": "5.16", "status": "affected" }, { "version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.27", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.13", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17", "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": "5.10.80", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.3", "versionEndExcluding": "5.15.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.16.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "5.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8f317cd888059c59e2fa924bf4b0957cfa53f78e" }, { "url": "https://git.kernel.org/stable/c/e0bcd6b5779352aed88f2e538a82a39f1a7715bb" }, { "url": "https://git.kernel.org/stable/c/589a954daab5e18399860b6c8ffaeaf79844eb20" }, { "url": "https://git.kernel.org/stable/c/13765de8148f71fa795e0a6607de37c49ea5915a" } ], "title": "sched/fair: Fix fault in reweight_entity", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48921", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:33:28.558357Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:01.045Z" } } ] } }