ghsa-qp63-w47q-g9vj
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
usb: dwc3: ep0: fix NULL pointer exception
There is no validation of the index from dwc3_wIndex_to_dep() and we might be referring a non-existing ep and trigger a NULL pointer exception. In certain configurations we might use fewer eps and the index might wrongly indicate a larger ep index than existing.
By adding this validation from the patch we can actually report a wrong index back to the caller.
In our usecase we are using a composite device on an older kernel, but upstream might use this fix also. Unfortunately, I cannot describe the hardware for others to reproduce the issue as it is a proprietary implementation.
[ 82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4 [ 82.966891] Mem abort info: [ 82.969663] ESR = 0x96000006 [ 82.972703] Exception class = DABT (current EL), IL = 32 bits [ 82.978603] SET = 0, FnV = 0 [ 82.981642] EA = 0, S1PTW = 0 [ 82.984765] Data abort info: [ 82.987631] ISV = 0, ISS = 0x00000006 [ 82.991449] CM = 0, WnR = 0 [ 82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc [ 83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000 [ 83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP [ 83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c) [ 83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1 [ 83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO) [ 83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c [ 83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94
...
[ 83.141788] Call trace: [ 83.144227] dwc3_ep0_handle_feature+0x414/0x43c [ 83.148823] dwc3_ep0_interrupt+0x3b4/0xc94 [ 83.181546] ---[ end trace aac6b5267d84c32f ]---
{ "affected": [], "aliases": [ "CVE-2021-47269" ], "database_specific": { "cwe_ids": [ "CWE-476" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-05-21T15:15:15Z", "severity": "MODERATE" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: ep0: fix NULL pointer exception\n\nThere is no validation of the index from dwc3_wIndex_to_dep() and we might\nbe referring a non-existing ep and trigger a NULL pointer exception. In\ncertain configurations we might use fewer eps and the index might wrongly\nindicate a larger ep index than existing.\n\nBy adding this validation from the patch we can actually report a wrong\nindex back to the caller.\n\nIn our usecase we are using a composite device on an older kernel, but\nupstream might use this fix also. Unfortunately, I cannot describe the\nhardware for others to reproduce the issue as it is a proprietary\nimplementation.\n\n[ 82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4\n[ 82.966891] Mem abort info:\n[ 82.969663] ESR = 0x96000006\n[ 82.972703] Exception class = DABT (current EL), IL = 32 bits\n[ 82.978603] SET = 0, FnV = 0\n[ 82.981642] EA = 0, S1PTW = 0\n[ 82.984765] Data abort info:\n[ 82.987631] ISV = 0, ISS = 0x00000006\n[ 82.991449] CM = 0, WnR = 0\n[ 82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc\n[ 83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000\n[ 83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP\n[ 83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c)\n[ 83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1\n[ 83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO)\n[ 83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c\n[ 83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94\n\n...\n\n[ 83.141788] Call trace:\n[ 83.144227] dwc3_ep0_handle_feature+0x414/0x43c\n[ 83.148823] dwc3_ep0_interrupt+0x3b4/0xc94\n[ 83.181546] ---[ end trace aac6b5267d84c32f ]---", "id": "GHSA-qp63-w47q-g9vj", "modified": "2024-12-24T18:30:48Z", "published": "2024-05-21T15:31:41Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47269" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/366369b89bedd59b1425386e8d4a18a466e420e4" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/470403639114895e2697c766fbe17be8d0e9b67a" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/60156089f07e724e4dc8483702d5e1ede4522749" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/788755756dd4a6aba1de479fec20b0fa600e7f19" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/96b74a99d360235c24052f1d060e64ac53f43528" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/990dc90750772622d44ca2ea6652c521e6f67e16" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/bd551e7c85939de2182010273450bfa78c3742fc" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/d00889080ab60051627dab1d85831cd9db750e2a" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "type": "CVSS_V3" } ] }
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