CVE-2022-50652
Status: DeferredUnscored—
In the Linux kernel, the following vulnerability has been resolved:
uio: uio_dmem_genirq: Fix missing unlock in irq configuration
Commit b74351287d4b ("uio: fix a sleep-in-atomic-context bug in uio_dmem_genirq_irqcontrol()") started calling disable_irq() without holding the spinlock because it can sleep. However, that fix introduced another bug: if interrupt is already disabled and a new disable request comes in, then the spinlock is not unlocked:
('myfpga' is a simple 'uio_dmem_genirq' driver I wrote to test this)
The implementation of "uio_dmem_genirq" was based on "uio_pdrv_genirq" and it is used in a similar manner to the "uio_pdrv_genirq" driver with respect to interrupt configuration and handling.
Read full descriptionShow less
At the time "uio_dmem_genirq" was introduced, both had the same implementation of the 'uio_info' handlers irqcontrol() and handler(). Then commit 34cb27528398 ("UIO: Fix concurrency issue"), which was only applied to "uio_pdrv_genirq", ended up making them a little different. That commit, among other things, changed disable_irq() to disable_irq_nosync() in the implementation of irqcontrol(). The motivation there was to avoid a deadlock between irqcontrol() and handler(), since it added a spinlock in the irq handler, and disable_irq() waits for the completion of the irq handler.
By changing disable_irq() to disable_irq_nosync() in irqcontrol(), we also avoid the sleeping-whil ---truncated---
Technical details traces, logs and code from the original report
root@localhost:~# printf '\x00\x00\x00\x00' > /dev/uio0 root@localhost:~# printf '\x00\x00\x00\x00' > /dev/uio0 root@localhost:~# [ 14.851538] BUG: scheduling while atomic: bash/223/0x00000002 [ 14.851991] Modules linked in: uio_dmem_genirq uio myfpga(OE) bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper drm snd_pcm ppdev joydev psmouse snd_timer snd e1000fb_sys_fops syscopyarea parport sysfillrect soundcore sysimgblt input_leds pcspkr i2c_piix4 serio_raw floppy evbug qemu_fw_cfg mac_hid pata_acpi ip_tables x_tables autofs4 [last unloaded: parport_pc] [ 14.854206] CPU: 0 PID: 223 Comm: bash Tainted: G OE 6.0.0-rc7 #21 [ 14.854786] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 [ 14.855664] Call Trace: [ 14.855861] <TASK> [ 14.856025] dump_stack_lvl+0x4d/0x67 [ 14.856325] dump_stack+0x14/0x1a [ 14.856583] __schedule_bug.cold+0x4b/0x5c [ 14.856915] __schedule+0xe81/0x13d0 [ 14.857199] ? idr_find+0x13/0x20 [ 14.857456] ? get_work_pool+0x2d/0x50 [ 14.857756] ? __flush_work+0x233/0x280 [ 14.858068] ? __schedule+0xa95/0x13d0 [ 14.858307] ? idr_find+0x13/0x20 [ 14.858519] ? get_work_pool+0x2d/0x50 [ 14.858798] schedule+0x6c/0x100 [ 14.859009] schedule_hrtimeout_range_clock+0xff/0x110 [ 14.859335] ? tty_write_room+0x1f/0x30 [ 14.859598] ? n_tty_poll+0x1ec/0x220 [ 14.859830] ? tty_ldisc_deref+0x1a/0x20 [ 14.860090] schedule_hrtimeout_range+0x17/0x20 [ 14.860373] do_select+0x596/0x840 [ 14.860627] ? __kernel_text_address+0x16/0x50 [ 14.860954] ? poll_freewait+0xb0/0xb0 [ 14.861235] ? poll_freewait+0xb0/0xb0 [ 14.861517] ? rpm_resume+0x49d/0x780 [ 14.861798] ? common_interrupt+0x59/0xa0 [ 14.862127] ? asm_common_interrupt+0x2b/0x40 [ 14.862511] ? __uart_start.isra.0+0x61/0x70 [ 14.862902] ? __check_object_size+0x61/0x280 [ 14.863255] core_sys_select+0x1c6/0x400 [ 14.863575] ? vfs_write+0x1c9/0x3d0 [ 14.863853] ? vfs_write+0x1c9/0x3d0 [ 14.864121] ? _copy_from_user+0x45/0x70 [ 14.864526] do_pselect.constprop.0+0xb3/0xf0 [ 14.864893] ? do_syscall_64+0x6d/0x90 [ 14.865228] ? do_syscall_64+0x6d/0x90 [ 14.865556] __x64_sys_pselect6+0x76/0xa0 [ 14.865906] do_syscall_64+0x60/0x90 [ 14.866214] ? syscall_exit_to_user_mode+0x2a/0x50 [ 14.866640] ? do_syscall_64+0x6d/0x90 [ 14.866972] ? do_syscall_64+0x6d/0x90 [ 14.867286] ? do_syscall_64+0x6d/0x90 [ 14.867626] entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] stripped [ 14.872959] </TASK>
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.23%
- Percentile among all scored CVEs: 13
- Score date: 10/5/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
- https://git.kernel.org/stable/c/030b6c7bb1e4edebaee2b1e48fbcc9cd5998d51d
- https://git.kernel.org/stable/c/79a4bdb6b9920134af1a4738a1fa36a0438cd905
- https://git.kernel.org/stable/c/9977cb7af5a8f4738198b020436e2e56c5cd721e
- https://git.kernel.org/stable/c/9bf7a0b2b15cd12e15f7858072bd89933746de67
- https://git.kernel.org/stable/c/9de255c461d1b3f0242b3ad1450c3323a3e00b34
- https://git.kernel.org/stable/c/a323d24a0183be730d2398b11b3a91e5c2e222a0
- https://git.kernel.org/stable/c/ac5585bb06a2e82177269bee93e59887ce591106
- https://git.kernel.org/stable/c/eca77a25a7cb3201738f4b55b9b8fa1089d7d002
- https://git.kernel.org/stable/c/ee180e867ce4b2f744799247b81050b3e5dd62cd
Raw JSON (NVD)
Show
{
"id": "CVE-2022-50652",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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{
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{
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{
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{
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"version": "1d52cd8b52876145b0f6344be95fc750e30d9ecb",
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},
{
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"version": "4.9.215",
"lessThan": "4.9.337",
"versionType": "semver"
},
{
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"lessThan": "4.14.303",
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{
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{
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"lessThan": "5.4.229",
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{
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},
{
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"lessThan": "5.6",
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}
],
"programFiles": [
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],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "5.6"
},
{
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"version": "0",
"lessThan": "5.6",
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{
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},
{
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},
{
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},
{
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"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
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"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.86",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.0.16",
"versionType": "semver",
"lessThanOrEqual": "6.0.*"
},
{
"status": "unaffected",
"version": "6.1.2",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/uio/uio_dmem_genirq.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2025-12-09T01:16:48.063",
"references": [
{
"url": "https://git.kernel.org/stable/c/030b6c7bb1e4edebaee2b1e48fbcc9cd5998d51d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/79a4bdb6b9920134af1a4738a1fa36a0438cd905",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9977cb7af5a8f4738198b020436e2e56c5cd721e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9bf7a0b2b15cd12e15f7858072bd89933746de67",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9de255c461d1b3f0242b3ad1450c3323a3e00b34",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a323d24a0183be730d2398b11b3a91e5c2e222a0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ac5585bb06a2e82177269bee93e59887ce591106",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/eca77a25a7cb3201738f4b55b9b8fa1089d7d002",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ee180e867ce4b2f744799247b81050b3e5dd62cd",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuio: uio_dmem_genirq: Fix missing unlock in irq configuration\n\nCommit b74351287d4b (\"uio: fix a sleep-in-atomic-context bug in\nuio_dmem_genirq_irqcontrol()\") started calling disable_irq() without\nholding the spinlock because it can sleep. However, that fix introduced\nanother bug: if interrupt is already disabled and a new disable request\ncomes in, then the spinlock is not unlocked:\n\nroot@localhost:~# printf '\\x00\\x00\\x00\\x00' > /dev/uio0\nroot@localhost:~# printf '\\x00\\x00\\x00\\x00' > /dev/uio0\nroot@localhost:~# [ 14.851538] BUG: scheduling while atomic: bash/223/0x00000002\n[ 14.851991] Modules linked in: uio_dmem_genirq uio myfpga(OE) bochs drm_vram_helper drm_ttm_helper ttm drm_kms_helper drm snd_pcm ppdev joydev psmouse snd_timer snd e1000fb_sys_fops syscopyarea parport sysfillrect soundcore sysimgblt input_leds pcspkr i2c_piix4 serio_raw floppy evbug qemu_fw_cfg mac_hid pata_acpi ip_tables x_tables autofs4 [last unloaded: parport_pc]\n[ 14.854206] CPU: 0 PID: 223 Comm: bash Tainted: G OE 6.0.0-rc7 #21\n[ 14.854786] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n[ 14.855664] Call Trace:\n[ 14.855861] <TASK>\n[ 14.856025] dump_stack_lvl+0x4d/0x67\n[ 14.856325] dump_stack+0x14/0x1a\n[ 14.856583] __schedule_bug.cold+0x4b/0x5c\n[ 14.856915] __schedule+0xe81/0x13d0\n[ 14.857199] ? idr_find+0x13/0x20\n[ 14.857456] ? get_work_pool+0x2d/0x50\n[ 14.857756] ? __flush_work+0x233/0x280\n[ 14.858068] ? __schedule+0xa95/0x13d0\n[ 14.858307] ? idr_find+0x13/0x20\n[ 14.858519] ? get_work_pool+0x2d/0x50\n[ 14.858798] schedule+0x6c/0x100\n[ 14.859009] schedule_hrtimeout_range_clock+0xff/0x110\n[ 14.859335] ? tty_write_room+0x1f/0x30\n[ 14.859598] ? n_tty_poll+0x1ec/0x220\n[ 14.859830] ? tty_ldisc_deref+0x1a/0x20\n[ 14.860090] schedule_hrtimeout_range+0x17/0x20\n[ 14.860373] do_select+0x596/0x840\n[ 14.860627] ? __kernel_text_address+0x16/0x50\n[ 14.860954] ? poll_freewait+0xb0/0xb0\n[ 14.861235] ? poll_freewait+0xb0/0xb0\n[ 14.861517] ? rpm_resume+0x49d/0x780\n[ 14.861798] ? common_interrupt+0x59/0xa0\n[ 14.862127] ? asm_common_interrupt+0x2b/0x40\n[ 14.862511] ? __uart_start.isra.0+0x61/0x70\n[ 14.862902] ? __check_object_size+0x61/0x280\n[ 14.863255] core_sys_select+0x1c6/0x400\n[ 14.863575] ? vfs_write+0x1c9/0x3d0\n[ 14.863853] ? vfs_write+0x1c9/0x3d0\n[ 14.864121] ? _copy_from_user+0x45/0x70\n[ 14.864526] do_pselect.constprop.0+0xb3/0xf0\n[ 14.864893] ? do_syscall_64+0x6d/0x90\n[ 14.865228] ? do_syscall_64+0x6d/0x90\n[ 14.865556] __x64_sys_pselect6+0x76/0xa0\n[ 14.865906] do_syscall_64+0x60/0x90\n[ 14.866214] ? syscall_exit_to_user_mode+0x2a/0x50\n[ 14.866640] ? do_syscall_64+0x6d/0x90\n[ 14.866972] ? do_syscall_64+0x6d/0x90\n[ 14.867286] ? do_syscall_64+0x6d/0x90\n[ 14.867626] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[...] stripped\n[ 14.872959] </TASK>\n\n('myfpga' is a simple 'uio_dmem_genirq' driver I wrote to test this)\n\nThe implementation of \"uio_dmem_genirq\" was based on \"uio_pdrv_genirq\" and\nit is used in a similar manner to the \"uio_pdrv_genirq\" driver with respect\nto interrupt configuration and handling. At the time \"uio_dmem_genirq\" was\nintroduced, both had the same implementation of the 'uio_info' handlers\nirqcontrol() and handler(). Then commit 34cb27528398 (\"UIO: Fix concurrency\nissue\"), which was only applied to \"uio_pdrv_genirq\", ended up making them\na little different. That commit, among other things, changed disable_irq()\nto disable_irq_nosync() in the implementation of irqcontrol(). The\nmotivation there was to avoid a deadlock between irqcontrol() and\nhandler(), since it added a spinlock in the irq handler, and disable_irq()\nwaits for the completion of the irq handler.\n\nBy changing disable_irq() to disable_irq_nosync() in irqcontrol(), we also\navoid the sleeping-whil\n---truncated---"
}
],
"lastModified": "2026-06-17T05:23:56.183",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}