264 lines
15 KiB
JSON
264 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-2026-46270",
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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": "2026-05-13T15:03:33.109Z",
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"datePublished": "2026-06-03T15:50:12.537Z",
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"dateUpdated": "2026-08-05T12:30:54.591Z"
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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": "2026-08-05T12:30:54.591Z"
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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: rt9455: Fix use-after-free in power_supply_changed()\n\nUsing the `devm_` variant for requesting IRQ _before_ the `devm_`\nvariant for allocating/registering the `power_supply` handle, means that\nthe `power_supply` handle will be deallocated/unregistered _before_ the\ninterrupt handler (since `devm_` naturally deallocates in reverse\nallocation order). This means that during removal, there is a race\ncondition where an interrupt can fire just _after_ the `power_supply`\nhandle has been freed, *but* just _before_ the corresponding\nunregistration of the IRQ handler has run.\n\nThis will lead to the IRQ handler calling `power_supply_changed()` with\na freed `power_supply` handle. Which usually crashes the system or\notherwise silently corrupts the memory...\n\nNote that there is a similar situation which can also happen during\n`probe()`; the possibility of an interrupt firing _before_ registering\nthe `power_supply` handle. This would then lead to the nasty situation\nof using the `power_supply` handle *uninitialized* in\n`power_supply_changed()`.\n\nFix this racy use-after-free by making sure the IRQ is requested _after_\nthe registration of the `power_supply` handle."
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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:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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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 - Exploitation requires local driver teardown (module unload, sysfs unbind, or shutdown/reboot) that runs `devres_release_all()`; the vulnerable `power_supply_changed()` path is only reachable from the on-chip IRQ handler during that window, not from any network-facing protocol.\nAC:L - An attacker who can initiate driver removal can repeatedly assert charger interrupts (USB plug/unplug, charge events) to hit the narrow race between `power_supply_unregister()` and IRQ release; this is a standard attacker-controlled UAF race, not a layout-dependent condition.\nPR:N - On battery-powered embedded/mobile platforms with this IC, an attacker with brief physical possession can force power-off/reboot (no Linux account or capability) while manipulating the charging port to fire IRQs during devm teardown; explicit unbind/rmmod also works but is not the only path.\nUI:N - No victim interaction is required beyond the attacker’s own physical control of the device and charging port; exploitation does not depend on the victim opening files, mounting filesystems, or approving prompts.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the kernel security boundary; it does not cross VM, container, or IOMMU isolation boundaries.\nC:H - The IRQ handler calls `power_supply_changed()` on a freed `struct power_supply`, performing spinlock operations and `schedule_work()` on freed heap memory, which is a classic UAF that can be turned into arbitrary kernel memory disclosure.\nI:H - The same UAF writes to freed object fields (`changed`, locks, workqueue) and can be combined with heap grooming for arbitrary kernel writes or control-flow hijack, as noted by the fix author (“silently corrupts the memory”).\nA:H - Use-after-free in interrupt context typically causes immediate kernel oops/panic or silent memory corruption; the commit explicitly states this “usually crashes the system.”"
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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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"drivers/power/supply/rt9455_charger.c"
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"drivers/power/supply/rt9455_charger.c"
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}
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],
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"title": "power: supply: rt9455: Fix use-after-free in power_supply_changed()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |