CVE-2022-48984

{"id": "CVE-2022-48984", "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": "2024-10-21T20:15:10.360", "references": [{"url": "https://git.kernel.org/stable/c/9e2709d58a14a10eb00d919acd7dec071c33f8c8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fb855e9f3b6b42c72af3f1eb0b288998fe0d5ebb", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "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\ncan: slcan: fix freed work crash\n\nThe LTP test pty03 is causing a crash in slcan:\n BUG: kernel NULL pointer dereference, address: 0000000000000008\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 0 PID: 348 Comm: kworker/0:3 Not tainted 6.0.8-1-default #1 openSUSE Tumbleweed 9d20364b934f5aab0a9bdf84e8f45cfdfae39dab\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n Workqueue: 0x0 (events)\n RIP: 0010:process_one_work (/home/rich/kernel/linux/kernel/workqueue.c:706 /home/rich/kernel/linux/kernel/workqueue.c:2185)\n Code: 49 89 ff 41 56 41 55 41 54 55 53 48 89 f3 48 83 ec 10 48 8b 06 48 8b 6f 48 49 89 c4 45 30 e4 a8 04 b8 00 00 00 00 4c 0f 44 e0 <49> 8b 44 24 08 44 8b a8 00 01 00 00 41 83 e5 20 f6 45 10 04 75 0e\n RSP: 0018:ffffaf7b40f47e98 EFLAGS: 00010046\n RAX: 0000000000000000 RBX: ffff9d644e1b8b48 RCX: ffff9d649e439968\n RDX: 00000000ffff8455 RSI: ffff9d644e1b8b48 RDI: ffff9d64764aa6c0\n RBP: ffff9d649e4335c0 R08: 0000000000000c00 R09: ffff9d64764aa734\n R10: 0000000000000007 R11: 0000000000000001 R12: 0000000000000000\n R13: ffff9d649e4335e8 R14: ffff9d64490da780 R15: ffff9d64764aa6c0\n FS: 0000000000000000(0000) GS:ffff9d649e400000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000008 CR3: 0000000036424000 CR4: 00000000000006f0\n Call Trace:\n <TASK>\n worker_thread (/home/rich/kernel/linux/kernel/workqueue.c:2436)\n kthread (/home/rich/kernel/linux/kernel/kthread.c:376)\n ret_from_fork (/home/rich/kernel/linux/arch/x86/entry/entry_64.S:312)\n\nApparently, the slcan's tx_work is freed while being scheduled. While\nslcan_netdev_close() (netdev side) calls flush_work(&sl->tx_work),\nslcan_close() (tty side) does not. So when the netdev is never set UP,\nbut the tty is stuffed with bytes and forced to wakeup write, the work\nis scheduled, but never flushed.\n\nSo add an additional flush_work() to slcan_close() to be sure the work\nis flushed under all circumstances.\n\nThe Fixes commit below moved flush_work() from slcan_close() to\nslcan_netdev_close(). What was the rationale behind it? Maybe we can\ndrop the one in slcan_netdev_close()?\n\nI see the same pattern in can327. So it perhaps needs the very same fix."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: slcan: fix freed work crash La prueba LTP pty03 est\u00e1 provocando un fallo en slcan: BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 PID: 348 Comm: kworker/0:3 Not tainted 6.0.8-1-default #1 openSUSE Tumbleweed 9d20364b934f5aab0a9bdf84e8f45cfdfae39dab Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 01/04/2014 Cola de trabajo: 0x0 (eventos) RIP: 0010:process_one_work (/home/rich/kernel/linux/kernel/workqueue.c:706 /home/rich/kernel/linux/kernel/workqueue.c:2185) C\u00f3digo: 49 89 ff 41 56 41 55 41 54 55 53 48 89 f3 48 83 ec 10 48 8b 06 48 8b 6f 48 49 89 c4 45 30 e4 a8 04 b8 00 00 00 00 4c 0f 44 e0 &lt;49&gt; 8b 44 24 08 44 8b a8 00 01 00 00 41 83 e5 20 f6 45 10 04 75 0e RSP: 0018:ffffaf7b40f47e98 EFLAGS: 00010046 RAX: 000000000000000 RBX: ffff9d644e1b8b48 RCX: ffff9d649e439968 RDX: 00000000ffff8455 RSI: ffff9d644e1b8b48 RDI: ffff9d64764aa6c0 RBP: ffff9d649e4335c0 R08: 0000000000000c00 R09: ffff9d64764aa734 R10: 0000000000000007 R11: 0000000000000001 R12: 0000000000000000 R13: ffff9d649e4335e8 R14: ffff9d64490da780 R15: ffff9d64764aa6c0 FS: 000000000000000(0000) GS:ffff9d649e400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 0000000036424000 CR4: 00000000000006f0 Seguimiento de llamadas: worker_thread (/home/rich/kernel/linux/kernel/workqueue.c:2436) kthread (/home/rich/kernel/linux/kernel/kthread.c:376) ret_from_fork (/home/rich/kernel/linux/arch/x86/entry/entry_64.S:312) Aparentemente, el tx_work de slcan se libera mientras se programa. Mientras que slcan_netdev_close() (lado netdev) llama a flush_work(&amp;sl-&gt;tx_work), slcan_close() (lado tty) no lo hace. Entonces, cuando el netdev nunca se configura, pero el tty est\u00e1 lleno de bytes y se lo obliga a activar la escritura, el trabajo se programa, pero nunca se vac\u00eda. Por lo tanto, agregue un flush_work() adicional a slcan_close() para asegurarse de que el trabajo se vac\u00eda en todas las circunstancias. el commit de correcciones a continuaci\u00f3n movi\u00f3 flush_work() de slcan_close() a slcan_netdev_close(). \u00bfCu\u00e1l fue la raz\u00f3n detr\u00e1s de esto? \u00bfQuiz\u00e1s podamos eliminar el que est\u00e1 en slcan_netdev_close()? Veo el mismo patr\u00f3n en can327. Entonces, tal vez necesite la misma correcci\u00f3n."}], "lastModified": "2024-10-25T15:53:53.890", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6F673D41-57C0-46F3-AFE3-7FC909A29B19", "versionEndExcluding": "6.0.13", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3FFFB0B3-930D-408A-91E2-BAE0C2715D80"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8535320E-A0DB-4277-800E-D0CE5BBA59E8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "21718AA4-4056-40F2-968E-BDAA465A7872"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}