CVE-2021-46947

{"id": "CVE-2021-46947", "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": "2024-02-27T19:04:06.283", "references": [{"url": "https://git.kernel.org/stable/c/99ba0ea616aabdc8e26259fd722503e012199a76", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ebeac958b690123a0b40aa61f688f2f170035fad", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/99ba0ea616aabdc8e26259fd722503e012199a76", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/ebeac958b690123a0b40aa61f688f2f170035fad", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "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\nsfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues\n\nefx->xdp_tx_queue_count is initially initialized to num_possible_cpus() and is\nlater used to allocate and traverse efx->xdp_tx_queues lookup array. However,\nwe may end up not initializing all the array slots with real queues during\nprobing. This results, for example, in a NULL pointer dereference, when running\n\"# ethtool -S <iface>\", similar to below\n\n[2570283.664955][T4126959] BUG: kernel NULL pointer dereference, address: 00000000000000f8\n[2570283.681283][T4126959] #PF: supervisor read access in kernel mode\n[2570283.695678][T4126959] #PF: error_code(0x0000) - not-present page\n[2570283.710013][T4126959] PGD 0 P4D 0\n[2570283.721649][T4126959] Oops: 0000 [#1] SMP PTI\n[2570283.734108][T4126959] CPU: 23 PID: 4126959 Comm: ethtool Tainted: G O 5.10.20-cloudflare-2021.3.1 #1\n[2570283.752641][T4126959] Hardware name: <redacted>\n[2570283.781408][T4126959] RIP: 0010:efx_ethtool_get_stats+0x2ca/0x330 [sfc]\n[2570283.796073][T4126959] Code: 00 85 c0 74 39 48 8b 95 a8 0f 00 00 48 85 d2 74 2d 31 c0 eb 07 48 8b 95 a8 0f 00 00 48 63 c8 49 83 c4 08 83 c0 01 48 8b 14 ca <48> 8b 92 f8 00 00 00 49 89 54 24 f8 39 85 a0 0f 00 00 77 d7 48 8b\n[2570283.831259][T4126959] RSP: 0018:ffffb79a77657ce8 EFLAGS: 00010202\n[2570283.845121][T4126959] RAX: 0000000000000019 RBX: ffffb799cd0c9280 RCX: 0000000000000018\n[2570283.860872][T4126959] RDX: 0000000000000000 RSI: ffff96dd970ce000 RDI: 0000000000000005\n[2570283.876525][T4126959] RBP: ffff96dd86f0a000 R08: ffff96dd970ce480 R09: 000000000000005f\n[2570283.892014][T4126959] R10: ffffb799cd0c9fff R11: ffffb799cd0c9000 R12: ffffb799cd0c94f8\n[2570283.907406][T4126959] R13: ffffffffc11b1090 R14: ffff96dd970ce000 R15: ffffffffc11cd66c\n[2570283.922705][T4126959] FS: 00007fa7723f8740(0000) GS:ffff96f51fac0000(0000) knlGS:0000000000000000\n[2570283.938848][T4126959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[2570283.952524][T4126959] CR2: 00000000000000f8 CR3: 0000001a73e6e006 CR4: 00000000007706e0\n[2570283.967529][T4126959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[2570283.982400][T4126959] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[2570283.997308][T4126959] PKRU: 55555554\n[2570284.007649][T4126959] Call Trace:\n[2570284.017598][T4126959] dev_ethtool+0x1832/0x2830\n\nFix this by adjusting efx->xdp_tx_queue_count after probing to reflect the true\nvalue of initialized slots in efx->xdp_tx_queues."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: sfc: ajuste efx-&gt;xdp_tx_queue_count con el n\u00famero real de colas inicializadas. efx-&gt;xdp_tx_queue_count se inicializa inicialmente en num_possible_cpus() y luego se usa para asignar y recorrer la b\u00fasqueda de efx-&gt;xdp_tx_queues formaci\u00f3n. Sin embargo, es posible que terminemos sin inicializar todas las ranuras de la matriz con colas reales durante el sondeo. Esto da como resultado, por ejemplo, una desreferencia del puntero NULL, cuando se ejecuta \"# ethtool -S \", similar a lo siguiente [2570283.664955][T4126959] ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 000000000000000f8 [2570283.681283][T4126959] # PF: acceso de lectura de supervisor en modo kernel [2570283.695678][T4126959] #PF: error_code(0x0000) - p\u00e1gina no presente [2570283.710013][T4126959] PGD 0 P4D 0 [2570283.721649][T4126959] Ups: 0000 [# 1]MPD PTI [2570283.734108][T4126959] CPU: 23 PID: 4126959 Comunicaciones: ethtool Contaminado: GO 5.10.20-cloudflare-2021.3.1 #1 [2570283.752641][T4126959] Nombre de hardware: [2570283.78140 8][T4126959] QEPD: 0010:efx_ethtool_get_stats+0x2ca/0x330 [sfc] [2570283.796073][T4126959] C\u00f3digo: 00 85 c0 74 39 48 8b 95 a8 0f 00 00 48 85 d2 74 2d 31 c0 eb 07 48 8b 95 a8 0f 00 00 48 63 c8 49 83 c4 08 83 c0 01 48 8b 14 ca &lt;48&gt; 8b 92 f8 00 00 00 49 89 54 24 f8 39 85 a0 0f 00 00 77 d7 48 8b [2570283.831259][T4126959] RSP: 0018:ff ffb79a77657ce8 EFLAGS: 00010202 [2570283.845121 ][T4126959] RAX: 0000000000000019 RBX: ffffb799cd0c9280 RCX: 0000000000000018 [2570283.860872][T4126959] RDX: 0000000000000000 RSI: ffff96dd 970ce000 RDI: 0000000000000005 [2570283.876525][T4126959] RBP: ffff96dd86f0a000 R08: ffff96dd970ce480 R09: 000000000000005f [2570283.892014][T4 126959]R10 : ffffb799cd0c9fff R11: ffffb799cd0c9000 R12: ffffb799cd0c94f8 [2570283.907406][T4126959] R13: ffffffffc11b1090 R14: ffff96dd970ce000 R15: ffffffffc11cd66 c [2570283.922705][T4126959] FS: 00007fa7723f8740(0000) GS:ffff96f51fac0000(0000) knlGS:00000000000000000 [2570283.938848][T4126959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [2570283.952524][T4126959] CR2: 000000000000000f8 CR3: 0000001a73e6e006 CR4: 00000000007706 e0 [2570283.967529][T4126959] DR0: 00000000000000000 DR1: 0000000000000000 DR2: 00000000000000000 [2570283.982400][T4126959] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [2570283.997308][T4126959] PKRU: 55555554 [2570284.007649][T4126959] Seguimiento de llamadas: [257 0284.017598][T4126959] dev_ethtool+0x1832/0x2830 Solucione este problema ajustando efx-&gt;xdp_tx_queue_count despu\u00e9s de sondear para reflejar el verdadero valor de las ranuras inicializadas en efx-&gt;xdp_tx_queues."}], "lastModified": "2024-11-21T06:34:59.777", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C3814FA3-8141-4313-A852-8C4212BE12AD", "versionEndExcluding": "5.12.3", "versionStartIncluding": "5.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}