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vuln-cve/data/2021/46xxx/CVE-2021-46938.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2021-46938",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-02-25T13:45:52.721Z",
"datePublished": "2024-02-27T18:40:26.850Z",
"dateUpdated": "2026-05-11T13:44:48.604Z"
},
"containers": {
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"shortName": "Linux",
"dateUpdated": "2026-05-11T13:44:48.604Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm rq: fix double free of blk_mq_tag_set in dev remove after table load fails\n\nWhen loading a device-mapper table for a request-based mapped device,\nand the allocation/initialization of the blk_mq_tag_set for the device\nfails, a following device remove will cause a double free.\n\nE.g. (dmesg):\n device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device\n device-mapper: ioctl: unable to set up device queue for new table.\n Unable to handle kernel pointer dereference in virtual kernel address space\n Failing address: 0305e098835de000 TEID: 0305e098835de803\n Fault in home space mode while using kernel ASCE.\n AS:000000025efe0007 R3:0000000000000024\n Oops: 0038 ilc:3 [#1] SMP\n Modules linked in: ... lots of modules ...\n Supported: Yes, External\n CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X 5.3.18-53-default #1 SLE15-SP3\n Hardware name: IBM 8561 T01 7I2 (LPAR)\n Krnl PSW : 0704e00180000000 000000025e368eca (kfree+0x42/0x330)\n R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\n Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000\n 000000025e520270 000000025e8d1b40 0000000000000003 00000007aae10000\n 000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640\n 00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8\n Krnl Code: 000000025e368eb8: c4180041e100 lgrl %r1,25eba50b8\n 000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58\n #000000025e368ec4: e3b010000008 ag %r11,0(%r1)\n >000000025e368eca: e310b0080004 lg %r1,8(%r11)\n 000000025e368ed0: a7110001 tmll %r1,1\n 000000025e368ed4: a7740129 brc 7,25e369126\n 000000025e368ed8: e320b0080004 lg %r2,8(%r11)\n 000000025e368ede: b904001b lgr %r1,%r11\n Call Trace:\n [<000000025e368eca>] kfree+0x42/0x330\n [<000000025e5202a2>] blk_mq_free_tag_set+0x72/0xb8\n [<000003ff801316a8>] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod]\n [<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod]\n [<000003ff801233f0>] __dm_destroy+0x150/0x1d0 [dm_mod]\n [<000003ff8012bb9a>] dev_remove+0x162/0x1c0 [dm_mod]\n [<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod]\n [<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38 [dm_mod]\n [<000000025e3b11ee>] ksys_ioctl+0xbe/0xe0\n [<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40\n [<000000025e8c15ac>] system_call+0xd8/0x2c8\n Last Breaking-Event-Address:\n [<000000025e52029c>] blk_mq_free_tag_set+0x6c/0xb8\n Kernel panic - not syncing: Fatal exception: panic_on_oops\n\nWhen allocation/initialization of the blk_mq_tag_set fails in\ndm_mq_init_request_queue(), it is uninitialized/freed, but the pointer\nis not reset to NULL; so when dev_remove() later gets into\ndm_mq_cleanup_mapped_device() it sees the pointer and tries to\nuninitialize and free it again.\n\nFix this by setting the pointer to NULL in dm_mq_init_request_queue()\nerror-handling. Also set it to NULL in dm_mq_cleanup_mapped_device()."
}
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