{"id":"CVE-2023-54079","state":"PUBLISHED","title":"power: supply: bq27xxx: Fix poll_interval handling and races on remove","description":"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.","publishedAt":"2025-12-24T13:06:11.956Z","updatedAt":"2026-08-05T09:17:02.722Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"4c9615474fb0a41cfad658d78db3c9ec70912969","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"465d919151a1e8d40daf366b868914f59d073211","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"0c5f4cec759679c290720fbcf6bb81768e21c95b","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"e85757da9091998276ff21a13915ac25229cc232","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"e98e5bebfcafc75a7b41192a607dfea5c1268afa","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"d952a1eaafcc5f0351caad5dbe9b5b3300d1d529","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"b12faeca0e819ea09051a705fef9df7ea7e9e18c","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"c00bc80462afc7963f449d7f21d896d2f629cacc","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"4.14.316","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.284","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.244","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.181","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.114","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.31","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.5","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":["https://git.kernel.org/stable/c/4c9615474fb0a41cfad658d78db3c9ec70912969","https://git.kernel.org/stable/c/465d919151a1e8d40daf366b868914f59d073211","https://git.kernel.org/stable/c/0c5f4cec759679c290720fbcf6bb81768e21c95b","https://git.kernel.org/stable/c/e85757da9091998276ff21a13915ac25229cc232","https://git.kernel.org/stable/c/e98e5bebfcafc75a7b41192a607dfea5c1268afa","https://git.kernel.org/stable/c/d952a1eaafcc5f0351caad5dbe9b5b3300d1d529","https://git.kernel.org/stable/c/b12faeca0e819ea09051a705fef9df7ea7e9e18c","https://git.kernel.org/stable/c/c00bc80462afc7963f449d7f21d896d2f629cacc"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54079.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54079","state":"PUBLISHED","datePublished":"2025-12-24T13:06:11.956Z","dateUpdated":"2026-08-05T09:17:02.722Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T13:02:52.514Z"},"containers":{"cna":{"title":"power: supply: bq27xxx: Fix poll_interval handling and races on remove","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"4c9615474fb0a41cfad658d78db3c9ec70912969","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"465d919151a1e8d40daf366b868914f59d073211","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"0c5f4cec759679c290720fbcf6bb81768e21c95b","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"e85757da9091998276ff21a13915ac25229cc232","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"e98e5bebfcafc75a7b41192a607dfea5c1268afa","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"d952a1eaafcc5f0351caad5dbe9b5b3300d1d529","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"b12faeca0e819ea09051a705fef9df7ea7e9e18c","versionType":"git"},{"version":"8cfaaa811894a3ae2d7360a15a6cfccff3ebc7db","status":"affected","lessThan":"c00bc80462afc7963f449d7f21d896d2f629cacc","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"4.14.316","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.284","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.244","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.181","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.114","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.31","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.5","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T09:17:02.722Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}