384 lines
19 KiB
JSON
384 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-48636",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-25T13:44:28.315Z",
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"datePublished": "2024-04-28T12:59:28.858Z",
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"dateUpdated": "2026-08-05T08:51:35.257Z"
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},
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:51:35.257Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/s390/block/dasd_alias.c"
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],
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"drivers/s390/block/dasd_alias.c"
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],
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{
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"version": "2.6.25",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.25",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.9.330",
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"lessThanOrEqual": "4.9.*",
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"status": "unaffected",
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},
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{
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"lessThanOrEqual": "4.14.*",
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{
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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"version": "5.10.146",
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"lessThanOrEqual": "5.10.*",
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"versionType": "semver"
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},
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{
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"version": "5.15.71",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "5.19.12",
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"version": "6.0",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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{
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{
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"lang": "en",
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}
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}
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"content": {
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"timestamp": "2024-06-07T17:07:44.029910Z",
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"id": "CVE-2022-48636",
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"options": [
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"version": "2.0.3"
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}
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