{ "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-2026-89508", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89508", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:43:54.682Z", "updatedAt": "2026-10-19T08:47:59.672Z", "importedAt": "2026-10-24T01:58:35.090Z", "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": "RDMA/ucma: Lock the handler in ucma_set_ib_path()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Lock the handler in ucma_set_ib_path()\n\nucma_set_ib_path() calls ucma_event_handler() straight from the write()\npath, without the handler lock that keeps ctx->file stable while a uevent\nis queued. The handler re-reads ctx->file for every dereference:\n\n\tmutex_lock(&ctx->file->mut);\t\t\t/* file A */\n\tlist_add_tail(&uevent->list, &ctx->file->event_list);\t/* file B */\n\tmutex_unlock(&ctx->file->mut);\t\t\t/* file B */\n\twake_up_interruptible(&ctx->file->poll_wait);\t/* file B */\n\nA concurrent ucma_migrate_id() reassigns ctx->file while the SET_OPTION\ncaller sleeps in mutex_lock(), so the list_add_tail() lands on file B's\nevent_list while only file A's mutex is held, racing every other user of\nthat list:\n\n BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0\n Read of size 8 at addr ffff888153c6a418 by task poc_corr/486\n Call Trace:\n __list_add_valid_or_report+0x1aa/0x1c0\n ucma_event_handler+0x1be/0xc00\n ucma_set_ib_path+0x45e/0x710\n ucma_set_option+0x32e/0x590\n ucma_write+0x1f9/0x330\n Allocated by task 505:\n ucma_write_cm_event+0x1a1/0x660\n Freed by task 505:\n kfree+0x1da/0x4c0\n ucma_get_event+0x5d5/0x7e0\n\nThe freed object is a ucma_event that another thread dequeued from file B's\nlist under file B's mutex. File A's mut is left held on top of that,\nwedging its next writer in uninterruptible sleep.\n\nThis path needs a bound and address-resolved cm_id, so it requires an RDMA\ndevice to be present.\n\nTake the handler lock around the call.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "3dd07b369371a2f29e1c3caf1ade85bb92b4c551" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "b2da0d488a1c72956ebb0a57015ee8ee6a2f7748" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "71dc206f2e2a645dac78879768762451aa1799f7" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "764586f8f6180084c5a7d622120f526acc6ce0c9" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "28ac2dd416482d1c763c4af5d61af465b387fb50" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "43a7d8ae9f645dc00235cfa4bf57673c20b769f8" }, { "version": "09e328e47a695b0d346598f5d6593ee598e64885", "status": "affected", "versionType": "git", "lessThan": "ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.10" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }