{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89508", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.716Z", "datePublished": "2026-09-11T19:43:54.682Z", "dateUpdated": "2026-09-11T19:43:54.682Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:43:54.682Z"}, "descriptions": [{"lang": "en", "value": "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/core/ucma.c"], "versions": [{"version": "09e328e47a695b0d346598f5d6593ee598e64885", "lessThan": "764586f8f6180084c5a7d622120f526acc6ce0c9", "status": "affected", "versionType": "git"}, {"version": "09e328e47a695b0d346598f5d6593ee598e64885", "lessThan": "28ac2dd416482d1c763c4af5d61af465b387fb50", "status": "affected", "versionType": "git"}, {"version": "09e328e47a695b0d346598f5d6593ee598e64885", "lessThan": "43a7d8ae9f645dc00235cfa4bf57673c20b769f8", "status": "affected", "versionType": "git"}, {"version": "09e328e47a695b0d346598f5d6593ee598e64885", "lessThan": "ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820", "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/infiniband/core/ucma.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.10", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9"}, {"url": "https://git.kernel.org/stable/c/28ac2dd416482d1c763c4af5d61af465b387fb50"}, {"url": "https://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8"}, {"url": "https://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820"}], "title": "RDMA/ucma: Lock the handler in ucma_set_ib_path()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/infiniband/core/ucma.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "764586f8f6180084c5a7d622120f526acc6ce0c9", "status": "affected", "version": "09e328e47a695b0d346598f5d6593ee598e64885", "versionType": "git"}, {"lessThan": "28ac2dd416482d1c763c4af5d61af465b387fb50", "status": "affected", "version": "09e328e47a695b0d346598f5d6593ee598e64885", "versionType": "git"}, {"lessThan": "43a7d8ae9f645dc00235cfa4bf57673c20b769f8", "status": "affected", "version": "09e328e47a695b0d346598f5d6593ee598e64885", "versionType": "git"}, {"lessThan": "ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820", "status": "affected", "version": "09e328e47a695b0d346598f5d6593ee598e64885", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/infiniband/core/ucma.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"lessThan": "5.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-89508", "lastModified": "2026-09-11T20:19:33.143", "metrics": {}, "published": "2026-09-11T20:19:33.143", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/28ac2dd416482d1c763c4af5d61af465b387fb50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: RDMA/ucma use-after-free vulnerability leading to denial of service", "id": "2532308", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532308"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's RDMA/ucma component. A race condition exists in the `ucma_set_ib_path()` function when handling events concurrently with `ucma_migrate_id()`. This can allow a local attacker with access to an RDMA device to trigger a use-after-free vulnerability, potentially leading to system instability or a denial of service."], "name": "CVE-2026-89508", "public_date": "2026-09-11T19:43:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89508\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89508\nhttps://git.kernel.org/stable/c/28ac2dd416482d1c763c4af5d61af465b387fb50\nhttps://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8\nhttps://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9\nhttps://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820"], "threat_severity": "Important"}

{"created": "2026-09-12T03:45:07.950873+00:00", "updated": "2026-09-12T03:45:07.950884+00:00", "vendors": []}