| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: release page in error path to avoid BUG_ON\n\nConsider the following sequence of events:\n\n1. Userspace issues a UFFD ioctl, which ends up calling into\n shmem_mfill_atomic_pte(). We successfully account the blocks, we\n shmem_alloc_page(), but then the copy_from_user() fails. We return\n -ENOENT. We don't release the page we allocated.\n2. Our caller detects this error code, tries the copy_from_user() after\n dropping the mmap_lock, and retries, calling back into\n shmem_mfill_atomic_pte().\n3. Meanwhile, let's say another process filled up the tmpfs being used.\n4. So shmem_mfill_atomic_pte() fails to account blocks this time, and\n immediately returns - without releasing the page.\n\nThis triggers a BUG_ON in our caller, which asserts that the page\nshould always be consumed, unless -ENOENT is returned.\n\nTo fix this, detect if we have such a \"dangling\" page when accounting\nfails, and if so, release it before returning." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/shmem.c" |
| ], |
| "versions": [ |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "319116227e52d49eee671f0aa278bac89b3c1b69", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "07c9b834c97d0fa3402fb7f3f3b32df370a6ff1f", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "b3f1731c6d7fbc1ebe3ed8eff6d6bec56d76ff43", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "140cfd9980124aecb6c03ef2e69c72d0548744de", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "ad53127973034c63b5348715a1043d0e80ceb330", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "2d59a0ed8b26b8f3638d8afc31f839e27759f1f6", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "cb658a453b9327ce96ce5222c24d162b5b65b564", |
| "lessThan": "7ed9d238c7dbb1fdb63ad96a6184985151b0171c", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "mm/shmem.c" |
| ], |
| "versions": [ |
| { |
| "version": "4.11", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "4.11", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.14.233", |
| "lessThanOrEqual": "4.14.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "4.19.191", |
| "lessThanOrEqual": "4.19.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.4.120", |
| "lessThanOrEqual": "5.4.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.10.38", |
| "lessThanOrEqual": "5.10.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.11.22", |
| "lessThanOrEqual": "5.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.12.5", |
| "lessThanOrEqual": "5.12.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "5.13", |
| "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": "4.11", |
| "versionEndExcluding": "4.14.233" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "4.19.191" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "5.4.120" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "5.10.38" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "5.11.22" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "5.12.5" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "4.11", |
| "versionEndExcluding": "5.13" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/319116227e52d49eee671f0aa278bac89b3c1b69" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/07c9b834c97d0fa3402fb7f3f3b32df370a6ff1f" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/b3f1731c6d7fbc1ebe3ed8eff6d6bec56d76ff43" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/140cfd9980124aecb6c03ef2e69c72d0548744de" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ad53127973034c63b5348715a1043d0e80ceb330" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/2d59a0ed8b26b8f3638d8afc31f839e27759f1f6" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/7ed9d238c7dbb1fdb63ad96a6184985151b0171c" |
| } |
| ], |
| "title": "userfaultfd: release page in error path to avoid BUG_ON", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2021-46988", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
