CVE-2025-38063
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: dm: fix unconditional IO throttle caused by REQ_PREFLUSH When a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush() generates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, which causes the flush_bio to be throttled by wbt_wait(). An example from v5.4, similar problem also exists in upstream: crash> bt 2091206 PID: 2091206 TASK: ffff2050df92a300 CPU: 109 COMMAND: "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 After commit 2def2845cc33 ("xfs: don't allow log IO to be throttled"), the metadata submitted by xlog_write_iclog() should not be throttled. But due to the existence of the dm layer, throttling flush_bio indirectly causes the metadata bio to be throttled. Fix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes wbt_should_throttle() return false to avoid wbt_wait().
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 10:15:39.207000
Last modified
2026-11-05 21:18:08.297000
View original CVE JSON
{
"id": "CVE-2025-38063",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T10:15:39.207",
"lastModified": "2026-11-05T21:18:08.297",
"vulnStatus": "Modified",
"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 limitación de E/S incondicional causada por REQ_PREFLUSH Cuando se envía una biografía 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, también 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 limitación de la E/S del registro\"), los metadatos enviados por xlog_write_iclog() no deberían limitarse. Sin embargo, debido a la existencia de la capa dm, limitar la ejecución de flush_bio provoca indirectamente la limitación 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()."
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