{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-99039", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-99039", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-10-23T12:21:57.421Z", "updatedAt": "2026-10-23T12:21:57.421Z", "importedAt": "2026-10-24T01:58:41.756Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "memstick: core: wait for request completion before freeing card", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemstick: core: wait for request completion before freeing card\n\nIn memstick_alloc_card() and memstick_set_rw_addr(),\nwait_for_completion_timeout() is used to wait for device identification\nand address configuration requests to complete.\n\nThe memstick subsystem does not provide an abort or cancellation\ncallback in struct memstick_host for in-flight requests. If\nwait_for_completion_timeout() expires (for instance, when a USB transfer\nor command retry is delayed), memstick_alloc_card() returns an error and\nfrees the memstick_dev structure via kfree(card).\n\nHowever, the host controller driver (such as rtsx_usb_ms) is still\nrunning the request asynchronously in worker context. When the transfer\neventually finishes, the driver writes into host->req->data, which\npoints to memory inside the already freed card structure. This leads to\na KASAN slab-use-after-free write:\n\n BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990\n Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239\n Workqueue: events rtsx_usb_ms_handle_req\n Call Trace:\n ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450\n rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline]\n rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531\n process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560\n kthread+0x373/0x450 kernel/kthread.c:436\n\n Allocated by task 1662:\n memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline]\n memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452\n process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\n Freed by task 1662:\n kfree+0x20c/0x650 mm/slub.c:6792\n memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline]\n memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452\n process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396\n\nHost controller drivers (rtsx_usb_ms, jmb38x_ms, tifm_ms, r592) already\nimplement their own hardware and bus timeouts, and callers in\nmspro_block and ms_block already rely on wait_for_completion()\nunconditionally.\n\nReplace wait_for_completion_timeout() with wait_for_completion() in\nmemstick_set_rw_addr() and memstick_alloc_card() so that the card\nstructure is never freed while an asynchronous request is in flight.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d", "status": "affected", "versionType": "git", "lessThan": "c3ab92542475d59ae685cbb294e70ca4d0ba38e9" }, { "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d", "status": "affected", "versionType": "git", "lessThan": "810580cf60edc75c9891c2de3225e4cda78e4d9f" }, { "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d", "status": "affected", "versionType": "git", "lessThan": "f2795c50144d528dabc2cf2fd53c0f0c63a823a1" }, { "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d", "status": "affected", "versionType": "git", "lessThan": "3af81770e2011c6ac7bb597a4af2e4f3591f928c" }, { "version": "baf8532a147d5b76681ce040e2c8f25a3f0e718d", "status": "affected", "versionType": "git", "lessThan": "aa0a37b5024d921e96ac4f8f487c8bfbf1f1a582" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.25" }, { "version": "6.6.160", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.113", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.57", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }