{"id":"CVE-2022-48636","state":"PUBLISHED","title":"s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup","description":"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.","publishedAt":"2024-04-28T12:59:28.858Z","updatedAt":"2026-08-05T08:51:35.257Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"d86b4267834e6d4af62e3073e48166e349ab1b70","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"49f401a98b318761ca2e15d4c7869a20043fbed4","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"aaba5ff2742043705bc4c02fd0b2b246e2e16da1","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"2e473351400e3dd66f0b71eddcef82ee45a584c1","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"d3a67c21b18f33c79382084af556557c442f12a6","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"650a2e79d176db753654d3dde88e53a2033036ac","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"db7ba07108a48c0f95b74fabbfd5d63e924f992d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_alias.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"4.9.330","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.295","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.260","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.215","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.146","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.71","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.12","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_alias.c"]}],"references":["https://git.kernel.org/stable/c/d86b4267834e6d4af62e3073e48166e349ab1b70","https://git.kernel.org/stable/c/49f401a98b318761ca2e15d4c7869a20043fbed4","https://git.kernel.org/stable/c/aaba5ff2742043705bc4c02fd0b2b246e2e16da1","https://git.kernel.org/stable/c/2e473351400e3dd66f0b71eddcef82ee45a584c1","https://git.kernel.org/stable/c/f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b","https://git.kernel.org/stable/c/d3a67c21b18f33c79382084af556557c442f12a6","https://git.kernel.org/stable/c/650a2e79d176db753654d3dde88e53a2033036ac","https://git.kernel.org/stable/c/db7ba07108a48c0f95b74fabbfd5d63e924f992d"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/48xxx/CVE-2022-48636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-48636","state":"PUBLISHED","datePublished":"2024-04-28T12:59:28.858Z","dateUpdated":"2026-08-05T08:51:35.257Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-25T13:44:28.315Z"},"containers":{"cna":{"title":"s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"d86b4267834e6d4af62e3073e48166e349ab1b70","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"49f401a98b318761ca2e15d4c7869a20043fbed4","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"aaba5ff2742043705bc4c02fd0b2b246e2e16da1","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"2e473351400e3dd66f0b71eddcef82ee45a584c1","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"d3a67c21b18f33c79382084af556557c442f12a6","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"650a2e79d176db753654d3dde88e53a2033036ac","versionType":"git"},{"version":"8e09f21574ea3028d5629e5de759e0b196c690c5","status":"affected","lessThan":"db7ba07108a48c0f95b74fabbfd5d63e924f992d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_alias.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"4.9.330","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.295","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.260","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.215","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.146","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.71","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.19.12","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/s390/block/dasd_alias.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d86b4267834e6d4af62e3073e48166e349ab1b70"},{"url":"https://git.kernel.org/stable/c/49f401a98b318761ca2e15d4c7869a20043fbed4"},{"url":"https://git.kernel.org/stable/c/aaba5ff2742043705bc4c02fd0b2b246e2e16da1"},{"url":"https://git.kernel.org/stable/c/2e473351400e3dd66f0b71eddcef82ee45a584c1"},{"url":"https://git.kernel.org/stable/c/f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b"},{"url":"https://git.kernel.org/stable/c/d3a67c21b18f33c79382084af556557c442f12a6"},{"url":"https://git.kernel.org/stable/c/650a2e79d176db753654d3dde88e53a2033036ac"},{"url":"https://git.kernel.org/stable/c/db7ba07108a48c0f95b74fabbfd5d63e924f992d"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:51:35.257Z"},"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:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-06-07T17:07:44.029910Z","id":"CVE-2022-48636","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-29T16:01:41.917Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/d86b4267834e6d4af62e3073e48166e349ab1b70","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/49f401a98b318761ca2e15d4c7869a20043fbed4","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/aaba5ff2742043705bc4c02fd0b2b246e2e16da1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/2e473351400e3dd66f0b71eddcef82ee45a584c1","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f5fcc9d6d71d9ff7fdbdd4b89074e6e24fffc20b","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d3a67c21b18f33c79382084af556557c442f12a6","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/650a2e79d176db753654d3dde88e53a2033036ac","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/db7ba07108a48c0f95b74fabbfd5d63e924f992d","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:17:55.505Z"}}]}}}