132 lines
7.0 KiB
JSON
132 lines
7.0 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-2025-68807",
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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": "2025-12-24T10:30:51.045Z",
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"datePublished": "2026-01-13T15:29:14.483Z",
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"dateUpdated": "2026-05-11T21:53:43.171Z"
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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": "2026-05-11T21:53:43.171Z"
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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\nblock: fix race between wbt_enable_default and IO submission\n\nWhen wbt_enable_default() is moved out of queue freezing in elevator_change(),\nit can cause the wbt inflight counter to become negative (-1), leading to hung\ntasks in the writeback path. Tasks get stuck in wbt_wait() because the counter\nis in an inconsistent state.\n\nThe issue occurs because wbt_enable_default() could race with IO submission,\nallowing the counter to be decremented before proper initialization. This manifests\nas:\n\n rq_wait[0]:\n inflight: -1\n has_waiters: True\n\nrwb_enabled() checks the state, which can be updated exactly between wbt_wait()\n(rq_qos_throttle()) and wbt_track()(rq_qos_track()), then the inflight counter\nwill become negative.\n\nAnd results in hung task warnings like:\n task:kworker/u24:39 state:D stack:0 pid:14767\n Call Trace:\n rq_qos_wait+0xb4/0x150\n wbt_wait+0xa9/0x100\n __rq_qos_throttle+0x24/0x40\n blk_mq_submit_bio+0x672/0x7b0\n ...\n\nFix this by:\n\n1. Splitting wbt_enable_default() into:\n - __wbt_enable_default(): Returns true if wbt_init() should be called\n - wbt_enable_default(): Wrapper for existing callers (no init)\n - wbt_init_enable_default(): New function that checks and inits WBT\n\n2. Using wbt_init_enable_default() in blk_register_queue() to ensure\n proper initialization during queue registration\n\n3. Move wbt_init() out of wbt_enable_default() which is only for enabling\n disabled wbt from bfq and iocost, and wbt_init() isn't needed. Then the\n original lock warning can be avoided.\n\n4. Removing the ELEVATOR_FLAG_ENABLE_WBT_ON_EXIT flag and its handling\n code since it's no longer needed\n\nThis ensures WBT is properly initialized before any IO can be submitted,\npreventing the counter from going negative."
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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/bfq-iosched.c",
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"block/blk-sysfs.c",
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"block/blk-wbt.c",
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"block/blk-wbt.h",
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"block/elevator.c",
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"block/elevator.h"
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],
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"versions": [
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{
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"version": "78c271344b6f64ce24c845e54903e09928cf2061",
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"lessThan": "f55201fb3becff6a903fd29f4d1147cc7e91eb0c",
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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": "78c271344b6f64ce24c845e54903e09928cf2061",
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"lessThan": "9869d3a6fed381f3b98404e26e1afc75d680cbf9",
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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/bfq-iosched.c",
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"block/blk-sysfs.c",
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"block/blk-wbt.c",
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"block/blk-wbt.h",
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"block/elevator.c",
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"block/elevator.h"
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],
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"versions": [
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{
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"version": "6.16",
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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": "6.16",
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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": "6.18.3",
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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": "6.19",
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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": "6.16",
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"versionEndExcluding": "6.18.3"
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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": "6.16",
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"versionEndExcluding": "6.19"
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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/f55201fb3becff6a903fd29f4d1147cc7e91eb0c"
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},
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{
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"url": "https://git.kernel.org/stable/c/9869d3a6fed381f3b98404e26e1afc75d680cbf9"
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}
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],
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"title": "block: fix race between wbt_enable_default and IO submission",
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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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} |