{
"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-2022-49753",
"sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49753",
"idYear": 2022,
"status": "PUBLISHED",
"publishedAt": "2025-03-27T16:43:01.252Z",
"updatedAt": "2026-05-11T19:06:06.863Z",
"importedAt": "2026-10-24T01:56:49.724Z",
"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": "dmaengine: Fix double increment of client_count in dma_chan_get()",
"summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: Fix double increment of client_count in dma_chan_get()\n\nThe first time dma_chan_get() is called for a channel the channel\nclient_count is incorrectly incremented twice for public channels,\nfirst in balance_ref_count(), and again prior to returning. This\nresults in an incorrect client count which will lead to the\nchannel resources not being freed when they should be. A simple\n test of repeated module load and unload of async_tx on a Dell\n Power Edge R7425 also shows this resulting in a kref underflow\n warning.\n\n[ 124.329662] async_tx: api initialized (async)\n[ 129.000627] async_tx: api initialized (async)\n[ 130.047839] ------------[ cut here ]------------\n[ 130.052472] refcount_t: underflow; use-after-free.\n[ 130.057279] WARNING: CPU: 3 PID: 19364 at lib/refcount.c:28\nrefcount_warn_saturate+0xba/0x110\n[ 130.065811] Modules linked in: async_tx(-) rfkill intel_rapl_msr\nintel_rapl_common amd64_edac edac_mce_amd ipmi_ssif kvm_amd dcdbas kvm\nmgag200 drm_shmem_helper acpi_ipmi irqbypass drm_kms_helper ipmi_si\nsyscopyarea sysfillrect rapl pcspkr ipmi_devintf sysimgblt fb_sys_fops\nk10temp i2c_piix4 ipmi_msghandler acpi_power_meter acpi_cpufreq vfat\nfat drm fuse xfs libcrc32c sd_mod t10_pi sg ahci crct10dif_pclmul\nlibahci crc32_pclmul crc32c_intel ghash_clmulni_intel igb megaraid_sas\ni40e libata i2c_algo_bit ccp sp5100_tco dca dm_mirror dm_region_hash\ndm_log dm_mod [last unloaded: async_tx]\n[ 130.117361] CPU: 3 PID: 19364 Comm: modprobe Kdump: loaded Not\ntainted 5.14.0-185.el9.x86_64 #1\n[ 130.126091] Hardware name: Dell Inc. PowerEdge R7425/02MJ3T, BIOS\n1.18.0 01/17/2022\n[ 130.133806] RIP: 0010:refcount_warn_saturate+0xba/0x110\n[ 130.139041] Code: 01 01 e8 6d bd 55 00 0f 0b e9 72 9d 8a 00 80 3d\n26 18 9c 01 00 75 85 48 c7 c7 f8 a3 03 9d c6 05 16 18 9c 01 01 e8 4a\nbd 55 00 <0f> 0b e9 4f 9d 8a 00 80 3d 01 18 9c 01 00 0f 85 5e ff ff ff\n48 c7\n[ 130.157807] RSP: 0018:ffffbf98898afe68 EFLAGS: 00010286\n[ 130.163036] RAX: 0000000000000000 RBX: ffff9da06028e598 RCX: 0000000000000000\n[ 130.170172] RDX: ffff9daf9de26480 RSI: ffff9daf9de198a0 RDI: ffff9daf9de198a0\n[ 130.177316] RBP: ffff9da7cddf3970 R08: 0000000000000000 R09: 00000000ffff7fff\n[ 130.184459] R10: ffffbf98898afd00 R11: ffffffff9d9e8c28 R12: ffff9da7cddf1970\n[ 130.191596] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n[ 130.198739] FS: 00007f646435c740(0000) GS:ffff9daf9de00000(0000)\nknlGS:0000000000000000\n[ 130.206832] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 130.212586] CR2: 00007f6463b214f0 CR3: 00000008ab98c000 CR4: 00000000003506e0\n[ 130.219729] Call Trace:\n[ 130.222192] \n[ 130.224305] dma_chan_put+0x10d/0x110\n[ 130.227988] dmaengine_put+0x7a/0xa0\n[ 130.231575] __do_sys_delete_module.constprop.0+0x178/0x280\n[ 130.237157] ? syscall_trace_enter.constprop.0+0x145/0x1d0\n[ 130.242652] do_syscall_64+0x5c/0x90\n[ 130.246240] ? exc_page_fault+0x62/0x150\n[ 130.250178] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[ 130.255243] RIP: 0033:0x7f6463a3f5ab\n[ 130.258830] Code: 73 01 c3 48 8b 0d 75 a8 1b 00 f7 d8 64 89 01 48\n83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00\n00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 45 a8 1b 00 f7 d8 64 89\n01 48\n[ 130.277591] RSP: 002b:00007fff22f972c8 EFLAGS: 00000206 ORIG_RAX:\n00000000000000b0\n[ 130.285164] RAX: ffffffffffffffda RBX: 000055b6786edd40 RCX: 00007f6463a3f5ab\n[ 130.292303] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055b6786edda8\n[ 130.299443] RBP: 000055b6786edd40 R08: 0000000000000000 R09: 0000000000000000\n[ 130.306584] R10: 00007f6463b9eac0 R11: 0000000000000206 R12: 000055b6786edda8\n[ 130.313731] R13: 0000000000000000 R14: 000055b6786edda8 R15: 00007fff22f995f8\n[ 130.320875] \n[ 130.323081] ---[ end trace eff7156d56b5cf25 ]---\n\ncat /sys/class/dma/dma0chan*/in_use would get the wrong result.\n2\n2\n2\n\nTest-by: Jie Hai ",
"affected": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"versions": [
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "1b409e14b4b7af034e0450f95c165b6c5c87dbc1"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "c6221afe573413fd2981e291f7df4a58283e0654"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "18dd3b30d4c7e8440c63118c7a7b687372b9567f"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "42ecd72f02cd657b00b559621e7ef7d2c4d3e5f1"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "71c601965532c38030133535f7cd93c1efa75af1"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "142d644fd2cc059ffa042fbfb68e766433ef3afd"
},
{
"version": "d2f4f99db3e9ec8b063cf2e45704e2bb95428317",
"status": "affected",
"versionType": "git",
"lessThan": "f3dc1b3b4750851a94212dba249703dd0e50bb20"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"versions": [
{
"version": "4.0",
"status": "affected"
},
{
"version": "0",
"status": "unaffected",
"versionType": "semver",
"lessThan": "4.0"
},
{
"version": "4.14.305",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "4.14.*"
},
{
"version": "4.19.272",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"version": "5.4.231",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"version": "5.10.166",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"version": "5.15.91",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"version": "6.1.9",
"status": "unaffected",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"version": "6.2",
"status": "unaffected",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
]
}
]
}
}
}