CVE-2024-26796

{"id": "CVE-2024-26796", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-04-04T09:15:08.790", "references": [{"url": "https://git.kernel.org/stable/c/682dc133f83e0194796e6ea72eb642df1c03dfbe", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e0d17ee872cf8d0f51cc561329b8e1a0aa792bbb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e4f50e85de5a6b21dfdc0d7ca435eba4f62935c3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/682dc133f83e0194796e6ea72eb642df1c03dfbe", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/e0d17ee872cf8d0f51cc561329b8e1a0aa792bbb", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/e4f50e85de5a6b21dfdc0d7ca435eba4f62935c3", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: perf: ctr_get_width function for legacy is not defined\n\nWith parameters CONFIG_RISCV_PMU_LEGACY=y and CONFIG_RISCV_PMU_SBI=n\nlinux kernel crashes when you try perf record:\n\n$ perf record ls\n[ 46.749286] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[ 46.750199] Oops [#1]\n[ 46.750342] Modules linked in:\n[ 46.750608] CPU: 0 PID: 107 Comm: perf-exec Not tainted 6.6.0 #2\n[ 46.750906] Hardware name: riscv-virtio,qemu (DT)\n[ 46.751184] epc : 0x0\n[ 46.751430] ra : arch_perf_update_userpage+0x54/0x13e\n[ 46.751680] epc : 0000000000000000 ra : ffffffff8072ee52 sp : ff2000000022b8f0\n[ 46.751958] gp : ffffffff81505988 tp : ff6000000290d400 t0 : ff2000000022b9c0\n[ 46.752229] t1 : 0000000000000001 t2 : 0000000000000003 s0 : ff2000000022b930\n[ 46.752451] s1 : ff600000028fb000 a0 : 0000000000000000 a1 : ff600000028fb000\n[ 46.752673] a2 : 0000000ae2751268 a3 : 00000000004fb708 a4 : 0000000000000004\n[ 46.752895] a5 : 0000000000000000 a6 : 000000000017ffe3 a7 : 00000000000000d2\n[ 46.753117] s2 : ff600000028fb000 s3 : 0000000ae2751268 s4 : 0000000000000000\n[ 46.753338] s5 : ffffffff8153e290 s6 : ff600000863b9000 s7 : ff60000002961078\n[ 46.753562] s8 : ff60000002961048 s9 : ff60000002961058 s10: 0000000000000001\n[ 46.753783] s11: 0000000000000018 t3 : ffffffffffffffff t4 : ffffffffffffffff\n[ 46.754005] t5 : ff6000000292270c t6 : ff2000000022bb30\n[ 46.754179] status: 0000000200000100 badaddr: 0000000000000000 cause: 000000000000000c\n[ 46.754653] Code: Unable to access instruction at 0xffffffffffffffec.\n[ 46.754939] ---[ end trace 0000000000000000 ]---\n[ 46.755131] note: perf-exec[107] exited with irqs disabled\n[ 46.755546] note: perf-exec[107] exited with preempt_count 4\n\nThis happens because in the legacy case the ctr_get_width function was not\ndefined, but it is used in arch_perf_update_userpage.\n\nAlso remove extra check in riscv_pmu_ctr_get_width_mask"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: controladores: perf: ctr_get_width la funci\u00f3n para legado no est\u00e1 definida Con los par\u00e1metros CONFIG_RISCV_PMU_LEGACY=y y CONFIG_RISCV_PMU_SBI=n el kernel de Linux falla cuando intenta el registro de rendimiento: $ perf record ls [ 46.749286] No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000000 [ 46.750199] Ups [#1] [ 46.750342] M\u00f3dulos vinculados en: [ 46.750608] CPU: 0 PID: 107 Comm: perf-exec Not tainted 6.6.0 #2 [ 46.750906] Nombre del hardware : riscv-virtio,qemu (DT) [ 46.751184] epc : 0x0 [ 46.751430 ] ra : arch_perf_update_userpage+0x54/0x13e [ 46.751680] epc : 00000000000000000 ra : ffffffff8072ee52 sp : ff20000 00022b8f0 [46.751958] gp: ffffffff81505988 tp: ff6000000290d400 t0: ff2000000022b9c0 [ 46.752229] t1 : 0000000000000001 t2 : 0000000000000003 s0 : ff2000000022b930 [ 46.752451] s1 : ff600000028fb000 a0 : 0000000000000000 a 1: ff600000028fb000 [46.752673] a2: 0000000ae2751268 a3: 00000000004fb708 a4: 00000000000000004 [46.752895] a5: 0000000000000000 a6: 000000000017ffe3 a7: 00000000000000d2 [46.753117] s2: ff600000028fb000 s3: 0000000ae2751268 s4: 0000000000000000 [46.753338] s5: ffffffff8153e290 s6: ff600000863b9000 s7: ff60000002 961078 [46.753562] s8: ff60000002961048 s9: ff60000002961058 s10: 00000000000000001 [46.753783] s11: 0000000000000018 t3: ffffffffffffff ff t4 : ffffffffffffffff [ 46.754005] t5 : ff6000000292270c t6: ff2000000022bb30 [46.754179] estado: 0000000200000100 badaddr: 00000000000000000 causa: 0000000000000000c [46.754653] C\u00f3digo: No se puede acceder instrucci\u00f3n en 0xffffffffffffffec. [ 46.754939] ---[ end trace 0000000000000000 ]--- [ 46.755131] nota: perf-exec[107] sali\u00f3 con irqs deshabilitados [ 46.755546] nota: perf-exec[107] sali\u00f3 con preempt_count 4 Esto sucede porque en el legado En este caso, la funci\u00f3n ctr_get_width no se defini\u00f3, pero se usa en arch_perf_update_userpage. Tambi\u00e9n elimine el control adicional en riscv_pmu_ctr_get_width_mask"}], "lastModified": "2025-02-27T14:35:09.517", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "084897EF-9F0A-4459-ADD9-E47D969EF093", "versionEndExcluding": "6.6.21", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C538467-EDA0-4A9A-82EB-2925DE9FF827", "versionEndExcluding": "6.7.9", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "056BD938-0A27-4569-B391-30578B309EE3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F02056A5-B362-4370-9FF8-6F0BD384D520"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62075ACE-B2A0-4B16-829D-B3DA5AE5CC41"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A780F817-2A77-4130-A9B7-5C25606314E3"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AEB9199B-AB8F-4877-8964-E2BA95B5F15C"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}