266 lines
15 KiB
JSON
266 lines
15 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-2023-54079",
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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": "2025-12-24T13:02:52.514Z",
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"datePublished": "2025-12-24T13:06:11.956Z",
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"dateUpdated": "2026-08-05T09:17:02.722Z"
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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": "2026-08-05T09:17:02.722Z"
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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\npower: supply: bq27xxx: Fix poll_interval handling and races on remove\n\nBefore this patch bq27xxx_battery_teardown() was setting poll_interval = 0\nto avoid bq27xxx_battery_update() requeuing the delayed_work item.\n\nThere are 2 problems with this:\n\n1. If the driver is unbound through sysfs, rather then the module being\n rmmod-ed, this changes poll_interval unexpectedly\n\n2. This is racy, after it being set poll_interval could be changed\n before bq27xxx_battery_update() checks it through\n /sys/module/bq27xxx_battery/parameters/poll_interval\n\nFix this by added a removed attribute to struct bq27xxx_device_info and\nusing that instead of setting poll_interval to 0.\n\nThere also is another poll_interval related race on remove(), writing\n/sys/module/bq27xxx_battery/parameters/poll_interval will requeue\nthe delayed_work item for all devices on the bq27xxx_battery_devices\nlist and the device being removed was only removed from that list\nafter cancelling the delayed_work item.\n\nFix this by moving the removal from the bq27xxx_battery_devices list\nto before cancelling the delayed_work item."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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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 - Both sides of the race are reached through local interfaces — the `poll_interval` module parameter under /sys/module/, driver bind/unbind (or rmmod), and world-readable power_supply attributes under /sys/class/power_supply/. No network or physical access is required.\nAC:L - The attacker drives both sides of the race and can retry indefinitely (unbind/bind loop plus a writer/reader loop on the sysfs attributes), and the widest window spans the entire `power_supply_unregister()` call, which takes milliseconds. Once the work is re-armed the freed object is not touched for up to `poll_interval` seconds, leaving a large window for reliable heap reclaim.\nPR:L - The re-queue leg of the race is reachable from an ordinary unprivileged local user: reading world-readable /sys/class/power_supply/bq27xxx-N/capacity (and friends) enters `bq27xxx_battery_get_property()` → `bq27xxx_battery_update_unlocked()` → `mod_delayed_work()`, which is precisely the path the fix's `di->removed` flag closes under `di->lock`. The removal itself is a routine environmental event (module unload, sysfs unbind, or hot-removal of a w1/HDQ battery pack) rather than a privilege the attacker must hold.\nUI:N - No victim action is required — the attacker's own loops on the sysfs interfaces trigger the race, and the removal path also occurs during ordinary system operation such as module unload or battery hot-removal.\nS:U - The use-after-free is confined to kernel memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The resurrected work item reads `di->regs` and `di->bat` as raw pointers out of freed slab memory and dereferences them, so an attacker who reclaims the ~200-byte object gains an arbitrary kernel-memory read primitive whose results are observable through the power_supply cache.\nI:H - The freed object is dereferenced for an indirect call, `di->bus.read(di, ...)`, and the freed memory also hosts the armed `timer_list`/`work_struct` — both give control-flow hijack from attacker-sprayed data, and `mutex_lock(&di->lock)` plus `di->cache = cache` write into the freed allocation.\nA:H - Even without successful reclaim, running a delayed work item whose `work_struct` and mutex live in freed memory reliably produces workqueue/timer list corruption and a kernel oops — the original OOPS this code path was supposed to prevent."
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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/power/supply/bq27xxx_battery.c",
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"include/linux/power/bq27xxx_battery.h"
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],
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"versions": [
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"status": "affected",
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"status": "affected",
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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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"drivers/power/supply/bq27xxx_battery.c",
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"include/linux/power/bq27xxx_battery.h"
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],
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"versions": [
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{
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"version": "3.3",
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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": "3.3",
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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": "4.14.316",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.284",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.244",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.181",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.114",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.31",
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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": "6.3.5",
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"lessThanOrEqual": "6.3.*",
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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": "6.4",
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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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"references": [
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"url": "https://git.kernel.org/stable/c/4c9615474fb0a41cfad658d78db3c9ec70912969"
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"url": "https://git.kernel.org/stable/c/465d919151a1e8d40daf366b868914f59d073211"
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},
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{
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"url": "https://git.kernel.org/stable/c/0c5f4cec759679c290720fbcf6bb81768e21c95b"
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},
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{
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"url": "https://git.kernel.org/stable/c/e85757da9091998276ff21a13915ac25229cc232"
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},
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{
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"url": "https://git.kernel.org/stable/c/e98e5bebfcafc75a7b41192a607dfea5c1268afa"
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},
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{
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"url": "https://git.kernel.org/stable/c/d952a1eaafcc5f0351caad5dbe9b5b3300d1d529"
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},
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{
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"url": "https://git.kernel.org/stable/c/b12faeca0e819ea09051a705fef9df7ea7e9e18c"
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},
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{
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"url": "https://git.kernel.org/stable/c/c00bc80462afc7963f449d7f21d896d2f629cacc"
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}
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],
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"title": "power: supply: bq27xxx: Fix poll_interval handling and races on remove",
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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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} |