{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-12T13:11:57.504","vulnerabilities":[{"cve":{"id":"CVE-2024-35795","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-05-17T14:15:11.440","lastModified":"2025-01-10T18:10:58.830","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix deadlock while reading mqd from debugfs\n\nAn errant disk backup on my desktop got into debugfs and triggered the\nfollowing deadlock scenario in the amdgpu debugfs files. The machine\nalso hard-resets immediately after those lines are printed (although I\nwasn't able to reproduce that part when reading by hand):\n\n[ 1318.016074][ T1082] ======================================================\n[ 1318.016607][ T1082] WARNING: possible circular locking dependency detected\n[ 1318.017107][ T1082] 6.8.0-rc7-00015-ge0c8221b72c0 #17 Not tainted\n[ 1318.017598][ T1082] ------------------------------------------------------\n[ 1318.018096][ T1082] tar/1082 is trying to acquire lock:\n[ 1318.018585][ T1082] ffff98c44175d6a0 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x40/0x80\n[ 1318.019084][ T1082]\n[ 1318.019084][ T1082] but task is already holding lock:\n[ 1318.020052][ T1082] ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\n[ 1318.020607][ T1082]\n[ 1318.020607][ T1082] which lock already depends on the new lock.\n[ 1318.020607][ T1082]\n[ 1318.022081][ T1082]\n[ 1318.022081][ T1082] the existing dependency chain (in reverse order) is:\n[ 1318.023083][ T1082]\n[ 1318.023083][ T1082] -> #2 (reservation_ww_class_mutex){+.+.}-{3:3}:\n[ 1318.024114][ T1082]        __ww_mutex_lock.constprop.0+0xe0/0x12f0\n[ 1318.024639][ T1082]        ww_mutex_lock+0x32/0x90\n[ 1318.025161][ T1082]        dma_resv_lockdep+0x18a/0x330\n[ 1318.025683][ T1082]        do_one_initcall+0x6a/0x350\n[ 1318.026210][ T1082]        kernel_init_freeable+0x1a3/0x310\n[ 1318.026728][ T1082]        kernel_init+0x15/0x1a0\n[ 1318.027242][ T1082]        ret_from_fork+0x2c/0x40\n[ 1318.027759][ T1082]        ret_from_fork_asm+0x11/0x20\n[ 1318.028281][ T1082]\n[ 1318.028281][ T1082] -> #1 (reservation_ww_class_acquire){+.+.}-{0:0}:\n[ 1318.029297][ T1082]        dma_resv_lockdep+0x16c/0x330\n[ 1318.029790][ T1082]        do_one_initcall+0x6a/0x350\n[ 1318.030263][ T1082]        kernel_init_freeable+0x1a3/0x310\n[ 1318.030722][ T1082]        kernel_init+0x15/0x1a0\n[ 1318.031168][ T1082]        ret_from_fork+0x2c/0x40\n[ 1318.031598][ T1082]        ret_from_fork_asm+0x11/0x20\n[ 1318.032011][ T1082]\n[ 1318.032011][ T1082] -> #0 (&mm->mmap_lock){++++}-{3:3}:\n[ 1318.032778][ T1082]        __lock_acquire+0x14bf/0x2680\n[ 1318.033141][ T1082]        lock_acquire+0xcd/0x2c0\n[ 1318.033487][ T1082]        __might_fault+0x58/0x80\n[ 1318.033814][ T1082]        amdgpu_debugfs_mqd_read+0x103/0x250 [amdgpu]\n[ 1318.034181][ T1082]        full_proxy_read+0x55/0x80\n[ 1318.034487][ T1082]        vfs_read+0xa7/0x360\n[ 1318.034788][ T1082]        ksys_read+0x70/0xf0\n[ 1318.035085][ T1082]        do_syscall_64+0x94/0x180\n[ 1318.035375][ T1082]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[ 1318.035664][ T1082]\n[ 1318.035664][ T1082] other info that might help us debug this:\n[ 1318.035664][ T1082]\n[ 1318.036487][ T1082] Chain exists of:\n[ 1318.036487][ T1082]   &mm->mmap_lock --> reservation_ww_class_acquire --> reservation_ww_class_mutex\n[ 1318.036487][ T1082]\n[ 1318.037310][ T1082]  Possible unsafe locking scenario:\n[ 1318.037310][ T1082]\n[ 1318.037838][ T1082]        CPU0                    CPU1\n[ 1318.038101][ T1082]        ----                    ----\n[ 1318.038350][ T1082]   lock(reservation_ww_class_mutex);\n[ 1318.038590][ T1082]                                lock(reservation_ww_class_acquire);\n[ 1318.038839][ T1082]                                lock(reservation_ww_class_mutex);\n[ 1318.039083][ T1082]   rlock(&mm->mmap_lock);\n[ 1318.039328][ T1082]\n[ 1318.039328][ T1082]  *** DEADLOCK ***\n[ 1318.039328][ T1082]\n[ 1318.040029][ T1082] 1 lock held by tar/1082:\n[ 1318.040259][ T1082]  #0: ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\n[ 1318.040560][ T1082]\n[ 1318.040560][ T1082] stack backtrace:\n[\n---truncated---"},{"lang":"es","value":"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: drm/amdgpu: corrige el punto muerto al leer mqd desde debugfs Una copia de seguridad de disco errónea en mi escritorio entró en debugfs y desencadenó el siguiente escenario de punto muerto en los archivos amdgpu debugfs. La máquina también se reinicia inmediatamente después de imprimir esas líneas (aunque no pude reproducir esa parte cuando leí a mano): [ 1318.016074][ T1082] =============== ======================================= [ 1318.016607][ T1082] ADVERTENCIA: posible bloqueo circular dependencia detectada [ 1318.017107][ T1082] 6.8.0-rc7-00015-ge0c8221b72c0 #17 No contaminado [ 1318.017598][ T1082] ----------------------- ------------------------------- [ 1318.018096][ T1082] tar/1082 está intentando adquirir el bloqueo: [ 1318.018585][ T1082] ffff98c44175d6a0 (&mm->mmap_lock){++++}-{3:3}, en: __might_fault+0x40/0x80 [ 1318.019084][ T1082] [ 1318.019084][ T1082] pero la tarea ya mantiene el bloqueo: [ 1318.020052 ][ T1082] ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, en: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu] [ 1318.020607][ T1082] [ 1318.020607][ T1082] el bloqueo ya depende del nuevo cerrar con llave. [ 1318.020607][ T1082] [ 1318.022081][ T1082] [ 1318.022081][ T1082] la cadena de dependencia existente (en orden inverso) es: [ 1318.023083][ T1082] [ 1318.023083][ T1082] -> #2 (reservation_ww_ clase_mutex){+ .+.}-{3:3}: [ 1318.024114][ T1082] __ww_mutex_lock.constprop.0+0xe0/0x12f0 [ 1318.024639][ T1082] ww_mutex_lock+0x32/0x90 [ 1318.025161][ T1082] dep+0x18a/0x330 [ 1318.025683 ][ T1082] do_one_initcall+0x6a/0x350 [ 1318.026210][ T1082] kernel_init_freeable+0x1a3/0x310 [ 1318.026728][ T1082] kernel_init+0x15/0x1a0 [ 1318.027242][ T1082] from_fork+0x2c/0x40 [ 1318.027759][ T1082] ret_from_fork_asm+ 0x11/0x20 [ 1318.028281][ T1082] [ 1318.028281][ T1082] -> #1 (reservation_ww_class_acquire){+.+.}-{0:0}: [ 1318.029297][ T1082] dma_resv_lockdep+0x16c/0x330 [ 1 318.029790][ T1082] do_one_initcall+0x6a/0x350 [ 1318.030263][ T1082] kernel_init_freeable+0x1a3/0x310 [ 1318.030722][ T1082] kernel_init+0x15/0x1a0 [ 1318.031168][ T1082] bifurcación+0x2c/0x40 [ 1318.031598][ T1082] ret_from_fork_asm+0x11/ 0x20 [ 1318.032011][ T1082] [ 1318.032011][ T1082] -> #0 (&mm->mmap_lock){++++}-{3:3}: [ 1318.032778][ T1082] __lock_acquire+0x14bf/0x2680 [ 1318.033141 ] [ T1082] lock_acquire+0xcd/0x2c0 [ 1318.033487][ T1082] __might_fault+0x58/0x80 [ 1318.033814][ T1082] amdgpu_debugfs_mqd_read+0x103/0x250 [amdgpu] [ 1318.03418 1][T1082] lectura_proxy_completa+0x55/0x80 [1318.034487][T1082] vfs_read+0xa7/0x360 [ 1318.034788][ T1082] ksys_read+0x70/0xf0 [ 1318.035085][ T1082] do_syscall_64+0x94/0x180 [ 1318.035375][ T1082] wframe+0x46/0x4e [ 1318.035664][ T1082] [ 1318.035664][ T1082] Otra información que podría ayudarnos a depurar esto: [1318.035664] [T1082] [1318.036487] [T1082] La cadena existe de: [1318.036487] [T1082] & mm-> mmap_lock-> reservation_ww_class_acquire-> reservación_www_mutex. ] [ 1318.037310][T1082] Posible escenario de bloqueo inseguro: [ 1318.037310][ T1082] [ 1318.037838][ T1082] CPU0 CPU1 [ 1318.038101][ T1082] ---- ---- [ 1318.038350][ T1082] _class_mutex); [ 1318.038590][ T1082] bloqueo(reservation_ww_class_acquire); [ 1318.038839][ T1082] bloqueo(reservation_ww_class_mutex); [ 1318.039083][ T1082] rlock(&mm->mmap_lock); [ 1318.039328][ T1082] [ 1318.039328][ T1082] *** DEADLOCK *** [ 1318.039328][ T1082] [ 1318.040029][ T1082] 1 bloqueo retenido por tar/1082: [ 1318.040259][ T1082] #0: ffff98c4c13f55f8 ( reserve_ww_class_mutex){+.+.}-{3:3}, en: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu] [ 1318.040560][ T1082] [ 1318.040560][ T1082] seguimiento de pila: [ ---truncado---"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-667"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.6.24","matchCriteriaId":"A2469D58-C2A6-4C9E-9A71-83830808C4FD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.7.12","matchCriteriaId":"6BE9771A-BAFD-4624-95F9-58D536540C53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.8.3","matchCriteriaId":"4C59BBC3-6495-4A77-9C82-55EC7CDF5E02"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*","matchCriteriaId":"22BEDD49-2C6D-402D-9DBF-6646F6ECD10B"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/197f6d6987c55860f6eea1c93e4f800c59078874","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/4687e3c6ee877ee25e57b984eca00be53b9a8db5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8678b1060ae2b75feb60b87e5b75e17374e3c1c5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8b03556da6e576c62664b6cd01809e4a09d53b5b","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/197f6d6987c55860f6eea1c93e4f800c59078874","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/4687e3c6ee877ee25e57b984eca00be53b9a8db5","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8678b1060ae2b75feb60b87e5b75e17374e3c1c5","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/8b03556da6e576c62664b6cd01809e4a09d53b5b","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}