206 lines
10 KiB
JSON
206 lines
10 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-2026-90183",
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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": "2026-09-11T19:38:34.791Z",
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"datePublished": "2026-09-17T16:07:07.045Z",
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"dateUpdated": "2026-10-30T12:34:39.908Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:34:39.908Z"
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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\nblk-iolatency: clear delay state when freeing policy data\n\nio.latency can throttle a group which has no latency target of its own.\nWhen a sibling misses its target, check_scale_change() scales down its\npeers, and a peer that reaches queue depth one gets blkcg_use_delay()\ncalled on it on every further scale-down, even with min_lat_nsec == 0.\n\niolatency_pd_offline() resets the target through\niolatency_set_min_lat_nsec(), which clears the delay only on a nonzero\nto zero transition, so it never clears such a peer. Freeing the policy\ndata then leaves blkg->use_delay set and blkcg->congestion_count\nelevated with nothing left that can drop it.\n\nblk_cgroup_congested() then returns true for every task in that cgroup\nand its descendants for as long as the cgroup lives: page_cache_sync_ra()\ncuts readahead to a single page, page_cache_async_ra() skips it\naltogether, and __folio_throttle_swaprate() takes swap_avail_lock and\nschedules a throttle on anonymous folio allocation.\n\nClear the delay in iolatency_pd_free(). By then bio-held blkg\nreferences have drained, or the queue is frozen for policy\ndeactivation, so check_scale_change() cannot re-arm it. The free\ncallback can also see policy data which was never attached to a blkg,\nhence the pd->blkg check."
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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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"block/blk-iolatency.c"
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],
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"versions": [
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "27573278b1cbc2313ebd31309ac18ac6179b828a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "53ccb4b967edc5f82ff6f9c066fb96c31aa7561a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "b6449a915d1826e1450f6368fc379fe44caa06ca",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "5c6593422eb3c3a21505436ccf74599a433584c8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "02f1b90ab33ef99c89dd96a385b432ff57abc64d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d70675121546c35feaceebf7ed9caed8716640f3",
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"lessThan": "8935bf22c0a0db517a7f72f7097300e05dd852f5",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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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"block/blk-iolatency.c"
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],
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"versions": [
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{
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"version": "4.19",
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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": "4.19",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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"lessThanOrEqual": "*",
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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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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.6.160"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.12.114"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.18.57"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/27573278b1cbc2313ebd31309ac18ac6179b828a"
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},
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{
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"url": "https://git.kernel.org/stable/c/53ccb4b967edc5f82ff6f9c066fb96c31aa7561a"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6449a915d1826e1450f6368fc379fe44caa06ca"
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},
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{
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"url": "https://git.kernel.org/stable/c/5c6593422eb3c3a21505436ccf74599a433584c8"
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},
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{
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"url": "https://git.kernel.org/stable/c/02f1b90ab33ef99c89dd96a385b432ff57abc64d"
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},
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{
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"url": "https://git.kernel.org/stable/c/8935bf22c0a0db517a7f72f7097300e05dd852f5"
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}
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],
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"title": "blk-iolatency: clear delay state when freeing policy data",
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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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} |