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CVE-2022-48634 (GCVE-0-2022-48634)

Vulnerability from cvelistv5 – Published: 2024-04-28 12:59 – Updated: 2026-05-11 18:44
VLAI
Title
drm/gma500: Fix BUG: sleeping function called from invalid context errors
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/gma500: Fix BUG: sleeping function called from invalid context errors gma_crtc_page_flip() was holding the event_lock spinlock while calling crtc_funcs->mode_set_base() which takes ww_mutex. The only reason to hold event_lock is to clear gma_crtc->page_flip_event on mode_set_base() errors. Instead unlock it after setting gma_crtc->page_flip_event and on errors re-take the lock and clear gma_crtc->page_flip_event it it is still set. This fixes the following WARN/stacktrace: [ 512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870 [ 512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell [ 512.123031] preempt_count: 1, expected: 0 [ 512.123048] RCU nest depth: 0, expected: 0 [ 512.123066] INFO: lockdep is turned off. [ 512.123080] irq event stamp: 0 [ 512.123094] hardirqs last enabled at (0): [<0000000000000000>] 0x0 [ 512.123134] hardirqs last disabled at (0): [<ffffffff8d0ec28c>] copy_process+0x9fc/0x1de0 [ 512.123176] softirqs last enabled at (0): [<ffffffff8d0ec28c>] copy_process+0x9fc/0x1de0 [ 512.123207] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 512.123233] Preemption disabled at: [ 512.123241] [<0000000000000000>] 0x0 [ 512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G W 5.19.0+ #1 [ 512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013 [ 512.123323] Call Trace: [ 512.123346] <TASK> [ 512.123370] dump_stack_lvl+0x5b/0x77 [ 512.123412] __might_resched.cold+0xff/0x13a [ 512.123458] ww_mutex_lock+0x1e/0xa0 [ 512.123495] psb_gem_pin+0x2c/0x150 [gma500_gfx] [ 512.123601] gma_pipe_set_base+0x76/0x240 [gma500_gfx] [ 512.123708] gma_crtc_page_flip+0x95/0x130 [gma500_gfx] [ 512.123808] drm_mode_page_flip_ioctl+0x57d/0x5d0 [ 512.123897] ? drm_mode_cursor2_ioctl+0x10/0x10 [ 512.123936] drm_ioctl_kernel+0xa1/0x150 [ 512.123984] drm_ioctl+0x21f/0x420 [ 512.124025] ? drm_mode_cursor2_ioctl+0x10/0x10 [ 512.124070] ? rcu_read_lock_bh_held+0xb/0x60 [ 512.124104] ? lock_release+0x1ef/0x2d0 [ 512.124161] __x64_sys_ioctl+0x8d/0xd0 [ 512.124203] do_syscall_64+0x58/0x80 [ 512.124239] ? do_syscall_64+0x67/0x80 [ 512.124267] ? trace_hardirqs_on_prepare+0x55/0xe0 [ 512.124300] ? do_syscall_64+0x67/0x80 [ 512.124340] ? rcu_read_lock_sched_held+0x10/0x80 [ 512.124377] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 512.124411] RIP: 0033:0x7fcc4a70740f [ 512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00 [ 512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f [ 512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009 [ 512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034 [ 512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0 [ 512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0 [ 512.124647] </TASK>
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-16 20:42 UTC
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c , < c5812807e416618477d1bb0049727ce8bb8292fd (git)
Affected: f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c , < e5ae504c8623476e13032670f1a6d6344d53ec9b (git)
Affected: f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c , < a6ed7624bf4d0a32f2631e74828bca7b7bf15afd (git)
Affected: f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c , < 63e37a79f7bd939314997e29c2f5a9f0ef184281 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.146 , ≤ 5.10.* (semver)
Unaffected: 5.15.71 , ≤ 5.15.* (semver)
Unaffected: 5.19.12 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gma500: Fix BUG: sleeping function called from invalid context errors\n\ngma_crtc_page_flip() was holding the event_lock spinlock while calling\ncrtc_funcs-\u003emode_set_base() which takes ww_mutex.\n\nThe only reason to hold event_lock is to clear gma_crtc-\u003epage_flip_event\non mode_set_base() errors.\n\nInstead unlock it after setting gma_crtc-\u003epage_flip_event and on\nerrors re-take the lock and clear gma_crtc-\u003epage_flip_event it\nit is still set.\n\nThis fixes the following WARN/stacktrace:\n\n[  512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870\n[  512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell\n[  512.123031] preempt_count: 1, expected: 0\n[  512.123048] RCU nest depth: 0, expected: 0\n[  512.123066] INFO: lockdep is turned off.\n[  512.123080] irq event stamp: 0\n[  512.123094] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123134] hardirqs last disabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123176] softirqs last  enabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123207] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123233] Preemption disabled at:\n[  512.123241] [\u003c0000000000000000\u003e] 0x0\n[  512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G        W         5.19.0+ #1\n[  512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013\n[  512.123323] Call Trace:\n[  512.123346]  \u003cTASK\u003e\n[  512.123370]  dump_stack_lvl+0x5b/0x77\n[  512.123412]  __might_resched.cold+0xff/0x13a\n[  512.123458]  ww_mutex_lock+0x1e/0xa0\n[  512.123495]  psb_gem_pin+0x2c/0x150 [gma500_gfx]\n[  512.123601]  gma_pipe_set_base+0x76/0x240 [gma500_gfx]\n[  512.123708]  gma_crtc_page_flip+0x95/0x130 [gma500_gfx]\n[  512.123808]  drm_mode_page_flip_ioctl+0x57d/0x5d0\n[  512.123897]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.123936]  drm_ioctl_kernel+0xa1/0x150\n[  512.123984]  drm_ioctl+0x21f/0x420\n[  512.124025]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.124070]  ? rcu_read_lock_bh_held+0xb/0x60\n[  512.124104]  ? lock_release+0x1ef/0x2d0\n[  512.124161]  __x64_sys_ioctl+0x8d/0xd0\n[  512.124203]  do_syscall_64+0x58/0x80\n[  512.124239]  ? do_syscall_64+0x67/0x80\n[  512.124267]  ? trace_hardirqs_on_prepare+0x55/0xe0\n[  512.124300]  ? do_syscall_64+0x67/0x80\n[  512.124340]  ? rcu_read_lock_sched_held+0x10/0x80\n[  512.124377]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[  512.124411] RIP: 0033:0x7fcc4a70740f\n[  512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u003c89\u003e c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00\n[  512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[  512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f\n[  512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009\n[  512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034\n[  512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0\n[  512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0\n[  512.124647]  \u003c/TASK\u003e"
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        "dateUpdated": "2026-05-11T18:44:09.833Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c5812807e416618477d1bb0049727ce8bb8292fd"
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          "url": "https://git.kernel.org/stable/c/e5ae504c8623476e13032670f1a6d6344d53ec9b"
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          "url": "https://git.kernel.org/stable/c/a6ed7624bf4d0a32f2631e74828bca7b7bf15afd"
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          "url": "https://git.kernel.org/stable/c/63e37a79f7bd939314997e29c2f5a9f0ef184281"
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      "title": "drm/gma500: Fix BUG: sleeping function called from invalid context errors",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48634",
    "datePublished": "2024-04-28T12:59:19.749Z",
    "dateReserved": "2024-02-25T13:44:28.315Z",
    "dateUpdated": "2026-05-11T18:44:09.833Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-48634",
      "date": "2026-09-19",
      "epss": "0.00167",
      "percentile": "0.06383"
    },
    "fkie_nvd": {
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gma500: Fix BUG: sleeping function called from invalid context errors\n\ngma_crtc_page_flip() was holding the event_lock spinlock while calling\ncrtc_funcs-\u003emode_set_base() which takes ww_mutex.\n\nThe only reason to hold event_lock is to clear gma_crtc-\u003epage_flip_event\non mode_set_base() errors.\n\nInstead unlock it after setting gma_crtc-\u003epage_flip_event and on\nerrors re-take the lock and clear gma_crtc-\u003epage_flip_event it\nit is still set.\n\nThis fixes the following WARN/stacktrace:\n\n[  512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870\n[  512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell\n[  512.123031] preempt_count: 1, expected: 0\n[  512.123048] RCU nest depth: 0, expected: 0\n[  512.123066] INFO: lockdep is turned off.\n[  512.123080] irq event stamp: 0\n[  512.123094] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123134] hardirqs last disabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123176] softirqs last  enabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123207] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123233] Preemption disabled at:\n[  512.123241] [\u003c0000000000000000\u003e] 0x0\n[  512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G        W         5.19.0+ #1\n[  512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013\n[  512.123323] Call Trace:\n[  512.123346]  \u003cTASK\u003e\n[  512.123370]  dump_stack_lvl+0x5b/0x77\n[  512.123412]  __might_resched.cold+0xff/0x13a\n[  512.123458]  ww_mutex_lock+0x1e/0xa0\n[  512.123495]  psb_gem_pin+0x2c/0x150 [gma500_gfx]\n[  512.123601]  gma_pipe_set_base+0x76/0x240 [gma500_gfx]\n[  512.123708]  gma_crtc_page_flip+0x95/0x130 [gma500_gfx]\n[  512.123808]  drm_mode_page_flip_ioctl+0x57d/0x5d0\n[  512.123897]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.123936]  drm_ioctl_kernel+0xa1/0x150\n[  512.123984]  drm_ioctl+0x21f/0x420\n[  512.124025]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.124070]  ? rcu_read_lock_bh_held+0xb/0x60\n[  512.124104]  ? lock_release+0x1ef/0x2d0\n[  512.124161]  __x64_sys_ioctl+0x8d/0xd0\n[  512.124203]  do_syscall_64+0x58/0x80\n[  512.124239]  ? do_syscall_64+0x67/0x80\n[  512.124267]  ? trace_hardirqs_on_prepare+0x55/0xe0\n[  512.124300]  ? do_syscall_64+0x67/0x80\n[  512.124340]  ? rcu_read_lock_sched_held+0x10/0x80\n[  512.124377]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[  512.124411] RIP: 0033:0x7fcc4a70740f\n[  512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u003c89\u003e c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00\n[  512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[  512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f\n[  512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009\n[  512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034\n[  512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0\n[  512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0\n[  512.124647]  \u003c/TASK\u003e"
        },
        {
          "lang": "es",
          "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/gma500: Correcci\u00f3n de ERROR: funci\u00f3n inactiva llamada desde errores de contexto no v\u00e1lidos gma_crtc_page_flip() estaba manteniendo el spinlock event_lock mientras llamaba a crtc_funcs-\u0026gt;mode_set_base() que toma ww_mutex. La \u00fanica raz\u00f3n para mantener event_lock es borrar los errores de gma_crtc-\u0026gt;page_flip_event en mode_set_base(). En su lugar, desbloqu\u00e9elo despu\u00e9s de configurar gma_crtc-\u0026gt;page_flip_event y, en caso de errores, vuelva a tomar el bloqueo y borre gma_crtc-\u0026gt;page_flip_event si todav\u00eda est\u00e1 configurado. Esto corrige la siguiente ADVERTENCIA/stacktrace: [512.122953] ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/mutex.c:870 [512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, nombre: gnome-shell [512.123031] preempt_count: 1, esperado: 0 [512.123048] Profundidad del nido de RCU: 0, esperado: 0 [512.123066] INFORMACI\u00d3N: lockdep est\u00e1 desactivado. [ 512.123080] sello de evento irq: 0 [ 512.123094] hardirqs habilitado por \u00faltima vez en (0): [\u0026lt;0000000000000000\u0026gt;] 0x0 [ 512.123134] hardirqs deshabilitado por \u00faltima vez en (0): [] copy_process+0x9fc/0x1de0 [ 5 12.123176] softirqs habilitado por \u00faltima vez en (0): [] copy_process+0x9fc/0x1de0 [ 512.123207] softirqs deshabilitado por \u00faltima vez en (0): [\u0026lt;0000000000000000\u0026gt;] 0x0 [ 512.123233] Preferencia deshabilitada en: [ 512.123241] 0000000000\u0026gt;] 0x0 [ 512.123275] CPU: 3 PID: 1253 Comunicaciones: gnome-shell Contaminado: GW 5.19.0+ #1 [ 512.123304] Nombre de hardware: Packard Bell dot s/SJE01_CT, BIOS V1.10 23/07/2013 [ 512.123323] Seguimiento de llamadas : [ 512.123346]  [ 512.123370] dump_stack_lvl+0x5b/0x77 [ 512.123412] __might_resched.cold+0xff/0x13a [ 512.123458] ww_mutex_lock+0x1e/0xa0 [ 512.123495 ] psb_gem_pin+0x2c/0x150 [gma500_gfx] [ 512.123601] gma_pipe_set_base+0x76 /0x240 [gma500_gfx] [ 512.123708] gma_crtc_page_flip+0x95/0x130 [gma500_gfx] [ 512.123808] drm_mode_page_flip_ioctl+0x57d/0x5d0 [ 512.123897] ? drm_mode_cursor2_ioctl+0x10/0x10 [ 512.123936] drm_ioctl_kernel+0xa1/0x150 [ 512.123984] drm_ioctl+0x21f/0x420 [ 512.124025] ? drm_mode_cursor2_ioctl+0x10/0x10 [512.124070]? rcu_read_lock_bh_held+0xb/0x60 [512.124104]? lock_release+0x1ef/0x2d0 [ 512.124161] __x64_sys_ioctl+0x8d/0xd0 [ 512.124203] do_syscall_64+0x58/0x80 [ 512.124239] ? do_syscall_64+0x67/0x80 [512.124267]? trace_hardirqs_on_prepare+0x55/0xe0 [512.124300]? do_syscall_64+0x67/0x80 [512.124340]? rcu_read_lock_sched_held+0x10/0x80 [ 512.124377] Entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 512.124411] RIP: 0033:0x7fcc4a70740f [ 512.124442] C\u00f3digo: 00 48 89 44 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u0026lt;89\u0026gt; c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00 [ 24470]RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f [ 512.124524] RDX: 7ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009 [ 512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034 12.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0 [ 512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0 [ 512.124647 ] "
        }
      ],
      "id": "CVE-2022-48634",
      "lastModified": "2024-11-21T07:33:39.400",
      "metrics": {
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
              "version": "3.1"
            },
            "exploitabilityScore": 1.8,
            "impactScore": 3.4,
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      },
      "published": "2024-04-28T13:15:06.617",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/63e37a79f7bd939314997e29c2f5a9f0ef184281"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/a6ed7624bf4d0a32f2631e74828bca7b7bf15afd"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/c5812807e416618477d1bb0049727ce8bb8292fd"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "url": "https://git.kernel.org/stable/c/e5ae504c8623476e13032670f1a6d6344d53ec9b"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/63e37a79f7bd939314997e29c2f5a9f0ef184281"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/a6ed7624bf4d0a32f2631e74828bca7b7bf15afd"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/c5812807e416618477d1bb0049727ce8bb8292fd"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "url": "https://git.kernel.org/stable/c/e5ae504c8623476e13032670f1a6d6344d53ec9b"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/gma500/gma_display.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "c5812807e416618477d1bb0049727ce8bb8292fd",
                    "status": "affected",
                    "version": "f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e5ae504c8623476e13032670f1a6d6344d53ec9b",
                    "status": "affected",
                    "version": "f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a6ed7624bf4d0a32f2631e74828bca7b7bf15afd",
                    "status": "affected",
                    "version": "f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "63e37a79f7bd939314997e29c2f5a9f0ef184281",
                    "status": "affected",
                    "version": "f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/gpu/drm/gma500/gma_display.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.6"
                  },
                  {
                    "lessThan": "5.6",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.146",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.71",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.19.*",
                    "status": "unaffected",
                    "version": "5.19.12",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.0",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "5815811F-2BAA-4AFA-9676-1FC96960BA9C",
                    "versionEndExcluding": "5.10.146",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "080C1827-D257-4D5A-9071-779EF7F5EF0B",
                    "versionEndExcluding": "5.15.71",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "03B0F56B-C5CC-4E81-BB51-D07D569DE4CA",
                    "versionEndExcluding": "5.19.12",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "A46498B3-78E1-4623-AAE1-94D29A42BE4E",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "F8446E87-F5F6-41CA-8201-BAE0F0CA6DD9",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc5:*:*:*:*:*:*",
                    "matchCriteriaId": "8E5FB72F-67CE-43CC-83FE-541604D98182",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gma500: Fix BUG: sleeping function called from invalid context errors\n\ngma_crtc_page_flip() was holding the event_lock spinlock while calling\ncrtc_funcs-\u003emode_set_base() which takes ww_mutex.\n\nThe only reason to hold event_lock is to clear gma_crtc-\u003epage_flip_event\non mode_set_base() errors.\n\nInstead unlock it after setting gma_crtc-\u003epage_flip_event and on\nerrors re-take the lock and clear gma_crtc-\u003epage_flip_event it\nit is still set.\n\nThis fixes the following WARN/stacktrace:\n\n[  512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870\n[  512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell\n[  512.123031] preempt_count: 1, expected: 0\n[  512.123048] RCU nest depth: 0, expected: 0\n[  512.123066] INFO: lockdep is turned off.\n[  512.123080] irq event stamp: 0\n[  512.123094] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123134] hardirqs last disabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123176] softirqs last  enabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123207] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123233] Preemption disabled at:\n[  512.123241] [\u003c0000000000000000\u003e] 0x0\n[  512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G        W         5.19.0+ #1\n[  512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013\n[  512.123323] Call Trace:\n[  512.123346]  \u003cTASK\u003e\n[  512.123370]  dump_stack_lvl+0x5b/0x77\n[  512.123412]  __might_resched.cold+0xff/0x13a\n[  512.123458]  ww_mutex_lock+0x1e/0xa0\n[  512.123495]  psb_gem_pin+0x2c/0x150 [gma500_gfx]\n[  512.123601]  gma_pipe_set_base+0x76/0x240 [gma500_gfx]\n[  512.123708]  gma_crtc_page_flip+0x95/0x130 [gma500_gfx]\n[  512.123808]  drm_mode_page_flip_ioctl+0x57d/0x5d0\n[  512.123897]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.123936]  drm_ioctl_kernel+0xa1/0x150\n[  512.123984]  drm_ioctl+0x21f/0x420\n[  512.124025]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.124070]  ? rcu_read_lock_bh_held+0xb/0x60\n[  512.124104]  ? lock_release+0x1ef/0x2d0\n[  512.124161]  __x64_sys_ioctl+0x8d/0xd0\n[  512.124203]  do_syscall_64+0x58/0x80\n[  512.124239]  ? do_syscall_64+0x67/0x80\n[  512.124267]  ? trace_hardirqs_on_prepare+0x55/0xe0\n[  512.124300]  ? do_syscall_64+0x67/0x80\n[  512.124340]  ? rcu_read_lock_sched_held+0x10/0x80\n[  512.124377]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[  512.124411] RIP: 0033:0x7fcc4a70740f\n[  512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u003c89\u003e c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00\n[  512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[  512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f\n[  512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009\n[  512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034\n[  512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0\n[  512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0\n[  512.124647]  \u003c/TASK\u003e"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/gma500: Correcci\u00f3n de ERROR: funci\u00f3n inactiva llamada desde errores de contexto no v\u00e1lidos gma_crtc_page_flip() estaba manteniendo el spinlock event_lock mientras llamaba a crtc_funcs-\u0026gt;mode_set_base() que toma ww_mutex. La \u00fanica raz\u00f3n para mantener event_lock es borrar los errores de gma_crtc-\u0026gt;page_flip_event en mode_set_base(). En su lugar, desbloqu\u00e9elo despu\u00e9s de configurar gma_crtc-\u0026gt;page_flip_event y, en caso de errores, vuelva a tomar el bloqueo y borre gma_crtc-\u0026gt;page_flip_event si todav\u00eda est\u00e1 configurado. Esto corrige la siguiente ADVERTENCIA/stacktrace: [512.122953] ERROR: funci\u00f3n inactiva llamada desde un contexto no v\u00e1lido en kernel/locking/mutex.c:870 [512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, nombre: gnome-shell [512.123031] preempt_count: 1, esperado: 0 [512.123048] Profundidad del nido de RCU: 0, esperado: 0 [512.123066] INFORMACI\u00d3N: lockdep est\u00e1 desactivado. [ 512.123080] sello de evento irq: 0 [ 512.123094] hardirqs habilitado por \u00faltima vez en (0): [\u0026lt;0000000000000000\u0026gt;] 0x0 [ 512.123134] hardirqs deshabilitado por \u00faltima vez en (0): [] copy_process+0x9fc/0x1de0 [ 5 12.123176] softirqs habilitado por \u00faltima vez en (0): [] copy_process+0x9fc/0x1de0 [ 512.123207] softirqs deshabilitado por \u00faltima vez en (0): [\u0026lt;0000000000000000\u0026gt;] 0x0 [ 512.123233] Preferencia deshabilitada en: [ 512.123241] 0000000000\u0026gt;] 0x0 [ 512.123275] CPU: 3 PID: 1253 Comunicaciones: gnome-shell Contaminado: GW 5.19.0+ #1 [ 512.123304] Nombre de hardware: Packard Bell dot s/SJE01_CT, BIOS V1.10 23/07/2013 [ 512.123323] Seguimiento de llamadas : [ 512.123346]  [ 512.123370] dump_stack_lvl+0x5b/0x77 [ 512.123412] __might_resched.cold+0xff/0x13a [ 512.123458] ww_mutex_lock+0x1e/0xa0 [ 512.123495 ] psb_gem_pin+0x2c/0x150 [gma500_gfx] [ 512.123601] gma_pipe_set_base+0x76 /0x240 [gma500_gfx] [ 512.123708] gma_crtc_page_flip+0x95/0x130 [gma500_gfx] [ 512.123808] drm_mode_page_flip_ioctl+0x57d/0x5d0 [ 512.123897] ? drm_mode_cursor2_ioctl+0x10/0x10 [ 512.123936] drm_ioctl_kernel+0xa1/0x150 [ 512.123984] drm_ioctl+0x21f/0x420 [ 512.124025] ? drm_mode_cursor2_ioctl+0x10/0x10 [512.124070]? rcu_read_lock_bh_held+0xb/0x60 [512.124104]? lock_release+0x1ef/0x2d0 [ 512.124161] __x64_sys_ioctl+0x8d/0xd0 [ 512.124203] do_syscall_64+0x58/0x80 [ 512.124239] ? do_syscall_64+0x67/0x80 [512.124267]? trace_hardirqs_on_prepare+0x55/0xe0 [512.124300]? do_syscall_64+0x67/0x80 [512.124340]? rcu_read_lock_sched_held+0x10/0x80 [ 512.124377] Entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 512.124411] RIP: 0033:0x7fcc4a70740f [ 512.124442] C\u00f3digo: 00 48 89 44 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u0026lt;89\u0026gt; c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00 [ 24470]RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f [ 512.124524] RDX: 7ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009 [ 512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034 12.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0 [ 512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0 [ 512.124647 ] "
          }
        ],
        "id": "CVE-2022-48634",
        "lastModified": "2026-06-17T05:15:46.660",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.4,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2022-48634",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-07-16T20:42:08.256561Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-04-28T13:15:06.617",
        "references": [
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                "value": "CWE-667"
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            "source": "nvd@nist.gov",
            "type": "Primary"
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      "current_release_date": "2025-11-21T14:40:17+00:00",
      "cve": "CVE-2022-48634",
      "id": "CVE-2022-48634",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "108",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/gma500: Fix BUG: sleeping function called from invalid context errors",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48634.json",
      "version": "3"
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      "current_release_date": "2026-08-31T01:38:49Z",
      "cve": "CVE-2022-48634",
      "id": "CVE-2022-48634",
      "initial_release_date": "2024-04-30T02:26:34Z",
      "product_status:known_affected": "270",
      "product_status:known_not_affected": "251",
      "product_status:recommended": "457",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48634",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48634.json",
      "version": "53"
    },
    "vulnrichment": {
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                "url": "https://git.kernel.org/stable/c/63e37a79f7bd939314997e29c2f5a9f0ef184281"
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            "title": "CVE Program Container"
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            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "LOW",
                  "baseScore": 5.3,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "LOW",
                  "integrityImpact": "LOW",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L",
                  "version": "3.1"
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              },
              {
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                  "content": {
                    "id": "CVE-2022-48634",
                    "options": [
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                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
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                    "role": "CISA Coordinator",
                    "timestamp": "2024-07-16T20:42:08.256561Z",
                    "version": "2.0.3"
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                  "version": "5.6"
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                  "status": "unaffected",
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                  "versionType": "semver"
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                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "6.0",
                  "versionType": "original_commit_for_fix"
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              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gma500: Fix BUG: sleeping function called from invalid context errors\n\ngma_crtc_page_flip() was holding the event_lock spinlock while calling\ncrtc_funcs-\u003emode_set_base() which takes ww_mutex.\n\nThe only reason to hold event_lock is to clear gma_crtc-\u003epage_flip_event\non mode_set_base() errors.\n\nInstead unlock it after setting gma_crtc-\u003epage_flip_event and on\nerrors re-take the lock and clear gma_crtc-\u003epage_flip_event it\nit is still set.\n\nThis fixes the following WARN/stacktrace:\n\n[  512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870\n[  512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell\n[  512.123031] preempt_count: 1, expected: 0\n[  512.123048] RCU nest depth: 0, expected: 0\n[  512.123066] INFO: lockdep is turned off.\n[  512.123080] irq event stamp: 0\n[  512.123094] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123134] hardirqs last disabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123176] softirqs last  enabled at (0): [\u003cffffffff8d0ec28c\u003e] copy_process+0x9fc/0x1de0\n[  512.123207] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[  512.123233] Preemption disabled at:\n[  512.123241] [\u003c0000000000000000\u003e] 0x0\n[  512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G        W         5.19.0+ #1\n[  512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013\n[  512.123323] Call Trace:\n[  512.123346]  \u003cTASK\u003e\n[  512.123370]  dump_stack_lvl+0x5b/0x77\n[  512.123412]  __might_resched.cold+0xff/0x13a\n[  512.123458]  ww_mutex_lock+0x1e/0xa0\n[  512.123495]  psb_gem_pin+0x2c/0x150 [gma500_gfx]\n[  512.123601]  gma_pipe_set_base+0x76/0x240 [gma500_gfx]\n[  512.123708]  gma_crtc_page_flip+0x95/0x130 [gma500_gfx]\n[  512.123808]  drm_mode_page_flip_ioctl+0x57d/0x5d0\n[  512.123897]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.123936]  drm_ioctl_kernel+0xa1/0x150\n[  512.123984]  drm_ioctl+0x21f/0x420\n[  512.124025]  ? drm_mode_cursor2_ioctl+0x10/0x10\n[  512.124070]  ? rcu_read_lock_bh_held+0xb/0x60\n[  512.124104]  ? lock_release+0x1ef/0x2d0\n[  512.124161]  __x64_sys_ioctl+0x8d/0xd0\n[  512.124203]  do_syscall_64+0x58/0x80\n[  512.124239]  ? do_syscall_64+0x67/0x80\n[  512.124267]  ? trace_hardirqs_on_prepare+0x55/0xe0\n[  512.124300]  ? do_syscall_64+0x67/0x80\n[  512.124340]  ? rcu_read_lock_sched_held+0x10/0x80\n[  512.124377]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n[  512.124411] RIP: 0033:0x7fcc4a70740f\n[  512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 \u003c89\u003e c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00\n[  512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[  512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f\n[  512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009\n[  512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034\n[  512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0\n[  512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0\n[  512.124647]  \u003c/TASK\u003e"
            }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            },
            {
              "url": "https://git.kernel.org/stable/c/63e37a79f7bd939314997e29c2f5a9f0ef184281"
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      "cveMetadata": {
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        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48634",
        "datePublished": "2024-04-28T12:59:19.749Z",
        "dateReserved": "2024-02-25T13:44:28.315Z",
        "dateUpdated": "2026-05-11T18:44:09.833Z",
        "state": "PUBLISHED"
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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