{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54079","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-24T13:02:52.514Z","datePublished":"2025-12-24T13:06:11.956Z","dateUpdated":"2026-08-05T09:17:02.722Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T09:17:02.722Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/power/supply/bq27xxx_battery.c","include/linux/power/bq27xxx_battery.h"],"versions":[{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"4c9615474fb0a41cfad658d78db3c9ec70912969","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"465d919151a1e8d40daf366b868914f59d073211","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"0c5f4cec759679c290720fbcf6bb81768e21c95b","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"e85757da9091998276ff21a13915ac25229cc232","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"e98e5bebfcafc75a7b41192a607dfea5c1268afa","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"d952a1eaafcc5f0351caad5dbe9b5b3300d1d529","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"b12faeca0e819ea09051a705fef9df7ea7e9e18c","status":"affected","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","lessThan":"c00bc80462afc7963f449d7f21d896d2f629cacc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/power/supply/bq27xxx_battery.c","include/linux/power/bq27xxx_battery.h"],"versions":[{"version":"3.3","status":"affected"},{"version":"0","lessThan":"3.3","status":"unaffected","versionType":"semver"},{"version":"4.14.316","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.284","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.244","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.181","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.114","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.31","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.3.5","lessThanOrEqual":"6.3.*","status":"unaffected","versionType":"semver"},{"version":"6.4","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"4.14.316"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"4.19.284"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.4.244"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.181"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.31"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.3.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.4"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4c9615474fb0a41cfad658d78db3c9ec70912969"},{"url":"https://git.kernel.org/stable/c/465d919151a1e8d40daf366b868914f59d073211"},{"url":"https://git.kernel.org/stable/c/0c5f4cec759679c290720fbcf6bb81768e21c95b"},{"url":"https://git.kernel.org/stable/c/e85757da9091998276ff21a13915ac25229cc232"},{"url":"https://git.kernel.org/stable/c/e98e5bebfcafc75a7b41192a607dfea5c1268afa"},{"url":"https://git.kernel.org/stable/c/d952a1eaafcc5f0351caad5dbe9b5b3300d1d529"},{"url":"https://git.kernel.org/stable/c/b12faeca0e819ea09051a705fef9df7ea7e9e18c"},{"url":"https://git.kernel.org/stable/c/c00bc80462afc7963f449d7f21d896d2f629cacc"}],"title":"power: supply: bq27xxx: Fix poll_interval handling and races on remove","x_generator":{"engine":"bippy-1.2.0"}}}}