CVE-2025-38063

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COMMAND: \"kworker/u260:0\"\n #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8\n #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4\n #2 [ffff800084a2f880] schedule at ffff800040bfa4b4\n #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4\n #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc\n #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0\n #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254\n #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38\n #8 [ffff800084a2fa60] generic_make_request at ffff800040570138\n #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4\n #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs]\n #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs]\n #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs]\n #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs]\n #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs]\n #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs]\n #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08\n #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc\n #18 [ffff800084a2fe70] kthread at ffff800040118de4\n\nAfter commit 2def2845cc33 (\"xfs: don't allow log IO to be throttled\"),\nthe metadata submitted by xlog_write_iclog() should not be throttled.\nBut due to the existence of the dm layer, throttling flush_bio indirectly\ncauses the metadata bio to be throttled.\n\nFix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes\nwbt_should_throttle() return false to avoid wbt_wait()."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm.c"], "versions": [{"version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": "95d08924335f3b6f4ea0b92ebfe4fe0731c502d9", "status": "affected", "versionType": "git"}, {"version": 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"CISA-ADP", "dateUpdated": "2026-11-05T20:48:52.713Z"}}], "cna": {"title": "dm: fix unconditional IO throttle caused by REQ_PREFLUSH", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": "95d08924335f3b6f4ea0b92ebfe4fe0731c502d9", "versionType": "git"}, {"status": "affected", "version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": "52aa28f7b1708d76e315d78b5ed397932a1a97c3", "versionType": "git"}, {"status": "affected", "version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": "b55a97d1bd4083729a60d19beffe85d4c96680de", "versionType": "git"}, {"status": "affected", "version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": "2858cda9a8d95e6deee7e3b0a26adde696a9a4f5", "versionType": "git"}, {"status": "affected", "version": "e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c", "lessThan": 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[{"url": "https://git.kernel.org/stable/c/95d08924335f3b6f4ea0b92ebfe4fe0731c502d9"}, {"url": "https://git.kernel.org/stable/c/52aa28f7b1708d76e315d78b5ed397932a1a97c3"}, {"url": "https://git.kernel.org/stable/c/b55a97d1bd4083729a60d19beffe85d4c96680de"}, {"url": "https://git.kernel.org/stable/c/2858cda9a8d95e6deee7e3b0a26adde696a9a4f5"}, {"url": "https://git.kernel.org/stable/c/88f7f56d16f568f19e1a695af34a7f4a6ce537a6"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix unconditional IO throttle caused by REQ_PREFLUSH\n\nWhen a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush()\ngenerates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,\nwhich causes the flush_bio to be throttled by wbt_wait().\n\nAn example from v5.4, similar problem also exists in upstream:\n\n crash> bt 2091206\n PID: 2091206 TASK: ffff2050df92a300 CPU: 109 COMMAND: \"kworker/u260:0\"\n #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8\n #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4\n #2 [ffff800084a2f880] schedule at ffff800040bfa4b4\n #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4\n #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc\n #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0\n #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254\n #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38\n #8 [ffff800084a2fa60] generic_make_request at ffff800040570138\n #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4\n #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs]\n #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs]\n #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs]\n #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs]\n #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs]\n #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs]\n #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08\n #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc\n #18 [ffff800084a2fe70] kthread at ffff800040118de4\n\nAfter commit 2def2845cc33 (\"xfs: don't allow log IO to be throttled\"),\nthe metadata submitted by xlog_write_iclog() should not be throttled.\nBut due to the existence of the dm layer, throttling flush_bio indirectly\ncauses the metadata bio to be throttled.\n\nFix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes\nwbt_should_throttle() return false to avoid wbt_wait()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.141", "versionStartIncluding": "4.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.93", "versionStartIncluding": "4.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "499998F9-9F80-4E5B-895F-CF94A48EC1EF", "versionEndExcluding": "6.1.141", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "50A4A9DE-24AB-4FB4-AACD-85D8EABB0571", "versionEndExcluding": "6.6.93", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1AE98841-5774-4B45-A81C-2D188DB7E5C3", "versionEndExcluding": "6.12.31", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A9B72DD1-715C-4101-A720-1C8D70044C06", "versionEndExcluding": "6.14.9", "versionStartIncluding": "6.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix unconditional IO throttle caused by REQ_PREFLUSH\n\nWhen a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush()\ngenerates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,\nwhich causes the flush_bio to be throttled by wbt_wait().\n\nAn example from v5.4, similar problem also exists in upstream:\n\n crash> bt 2091206\n PID: 2091206 TASK: ffff2050df92a300 CPU: 109 COMMAND: \"kworker/u260:0\"\n #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8\n #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4\n #2 [ffff800084a2f880] schedule at ffff800040bfa4b4\n #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4\n #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc\n #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0\n #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254\n #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38\n #8 [ffff800084a2fa60] generic_make_request at ffff800040570138\n #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4\n #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs]\n #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs]\n #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs]\n #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs]\n #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs]\n #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs]\n #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08\n #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc\n #18 [ffff800084a2fe70] kthread at ffff800040118de4\n\nAfter commit 2def2845cc33 (\"xfs: don't allow log IO to be throttled\"),\nthe metadata submitted by xlog_write_iclog() should not be throttled.\nBut due to the existence of the dm layer, throttling flush_bio indirectly\ncauses the metadata bio to be throttled.\n\nFix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes\nwbt_should_throttle() return false to avoid wbt_wait()."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm: se corrige la limitaci\u00f3n de E/S incondicional causada por REQ_PREFLUSH Cuando se env\u00eda una biograf\u00eda con REQ_PREFLUSH a dm, __send_empty_flush() genera una flush_bio con REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, lo que hace que wbt_wait() limite la flush_bio. Un ejemplo de v5.4, tambi\u00e9n existe un problema similar en upstream: crash> bt 2091206 PID: 2091206 TAREA: ffff2050df92a300 CPU: 109 COMANDO: \"kworker/u260:0\" #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8 #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4 #2 [ffff800084a2f880] schedule at ffff800040bfa4b4 #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4 #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0 #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254 #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38 #8 [ffff800084a2fa60] generic_make_request at ffff800040570138 #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4 #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs] #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs] #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs] #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs] #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs] #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs] #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08 #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc #18 [ffff800084a2fe70] kthread at ffff800040118de4. Tras el commit 2def2845cc33 (\"xfs: no permitir la limitaci\u00f3n de la E/S del registro\"), los metadatos enviados por xlog_write_iclog() no deber\u00edan limitarse. Sin embargo, debido a la existencia de la capa dm, limitar la ejecuci\u00f3n de flush_bio provoca indirectamente la limitaci\u00f3n de los metadatos bio. Solucione esto agregando condicionalmente REQ_IDLE a flush_bio.bi_opf, lo que hace que wbt_should_throttle() devuelva falso para evitar wbt_wait()."}], "id": "CVE-2025-38063", "lastModified": "2026-11-05T21:18:08.297", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38063", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:48:51.702566Z", "version": "2.0.3"}}]}, "published": "2025-06-18T10:15:39.207", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2858cda9a8d95e6deee7e3b0a26adde696a9a4f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/52aa28f7b1708d76e315d78b5ed397932a1a97c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/88f7f56d16f568f19e1a695af34a7f4a6ce537a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95d08924335f3b6f4ea0b92ebfe4fe0731c502d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b55a97d1bd4083729a60d19beffe85d4c96680de"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dm: fix unconditional IO throttle caused by REQ_PREFLUSH", "id": "2373387", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373387"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm: fix unconditional IO throttle caused by REQ_PREFLUSH\nWhen a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush()\ngenerates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC,\nwhich causes the flush_bio to be throttled by wbt_wait().\nAn example from v5.4, similar problem also exists in upstream:\ncrash> bt 2091206\nPID: 2091206 TASK: ffff2050df92a300 CPU: 109 COMMAND: \"kworker/u260:0\"\n#0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8\n#1 [ffff800084a2f820] __schedule at ffff800040bfa0c4\n#2 [ffff800084a2f880] schedule at ffff800040bfa4b4\n#3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4\n#4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc\n#5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0\n#6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254\n#7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38\n#8 [ffff800084a2fa60] generic_make_request at ffff800040570138\n#9 [ffff800084a2fae0] submit_bio at ffff8000405703b4\n#10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs]\n#11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs]\n#12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs]\n#13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs]\n#14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs]\n#15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs]\n#16 [ffff800084a2fdb0] process_one_work at ffff800040111d08\n#17 [ffff800084a2fe00] worker_thread at ffff8000401121cc\n#18 [ffff800084a2fe70] kthread at ffff800040118de4\nAfter commit 2def2845cc33 (\"xfs: don't allow log IO to be throttled\"),\nthe metadata submitted by xlog_write_iclog() should not be throttled.\nBut due to the existence of the dm layer, throttling flush_bio indirectly\ncauses the metadata bio to be throttled.\nFix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes\nwbt_should_throttle() return false to avoid wbt_wait()."], "name": "CVE-2025-38063", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38063\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38063\nhttps://lore.kernel.org/linux-cve-announce/2025061835-CVE-2025-38063-e0a8@gregkh/T"], "threat_severity": "Moderate"}

{}