{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48636", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:44:28.315Z", "datePublished": "2024-04-28T12:59:28.858Z", "dateUpdated": "2026-08-05T08:51:35.257Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:51:35.257Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup\n\nFix Oops in dasd_alias_get_start_dev() function caused by the pavgroup\npointer being NULL.\n\nThe pavgroup pointer is checked on the entrance of the function but\nwithout the lcu->lock being held. Therefore there is a race window\nbetween dasd_alias_get_start_dev() and _lcu_update() which sets\npavgroup to NULL with the lcu->lock held.\n\nFix by checking the pavgroup pointer with lcu->lock held." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is local DASD block I/O (do_dasd_request → dasd_eckd_build_alias_cp → dasd_alias_get_start_dev) on s390 PAV devices, reached via ordinary filesystem or block access; it is not network- or physically triggered.\nAC:L - An attacker can continuously generate DASD I/O on one side of the race; per guidance to prefer higher severity when uncertain, and because UAF races are AC:L unless clearly attacker-uncontrollable, complexity is Low.\nPR:L - Any unprivileged local user whose I/O hits a DASD-backed filesystem or accessible DASD block device reaches build_alias_cp without CAP_SYS_ADMIN; format ioctls need admin but the normal I/O path does not.\nUI:N - The attacker triggers the path with their own reads/writes; no separate victim action (mount, open crafted file, or admin reconfiguration) is required.\nS:U - Impact is confined to the host kernel’s DASD/alias state within the same OS security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - Concurrent _lcu_update() kfree()s the alias_pav_group while get_start_dev holds a stale pointer, yielding a heap UAF whose reclaim can disclose kernel memory via controlled freed-object contents.\nI:H - The same UAF both reads and writes group->next on freed memory and may return a attacker-influenced dasd_device used for CCW construction, enabling heap corruption and control-flow impact under standard UAF exploitation.\nA:H - Dereferencing the freed pavgroup causes a kernel Oops/panic in dasd_alias_get_start_dev, which is Availability High under kernel CVSS guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/s390/block/dasd_alias.c" ], "versions": [ { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "d86b4267834e6d4af62e3073e48166e349ab1b70", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "49f401a98b318761ca2e15d4c7869a20043fbed4", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "aaba5ff2742043705bc4c02fd0b2b246e2e16da1", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "2e473351400e3dd66f0b71eddcef82ee45a584c1", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "d3a67c21b18f33c79382084af556557c442f12a6", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "650a2e79d176db753654d3dde88e53a2033036ac", "status": "affected", "versionType": "git" }, { "version": "8e09f21574ea3028d5629e5de759e0b196c690c5", "lessThan": "db7ba07108a48c0f95b74fabbfd5d63e924f992d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/s390/block/dasd_alias.c" ], "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.330", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.295", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.260", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.215", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.146", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.71", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.12", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "2.6.25", "versionEndExcluding": "4.9.330" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "4.14.295" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "4.19.260" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.4.215" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.10.146" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.15.71" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.25", "versionEndExcluding": "5.19.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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