CVE-2023-52894 (GCVE-0-2023-52894)

Vulnerability from cvelistv5 – Published: 2024-08-21 06:10 – Updated: 2026-01-05 10:17
VLAI?
Title
usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate() In Google internal bug 265639009 we've received an (as yet) unreproducible crash report from an aarch64 GKI 5.10.149-android13 running device. AFAICT the source code is at: https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-12-05_13-5.10 The call stack is: ncm_close() -> ncm_notify() -> ncm_do_notify() with the crash at: ncm_do_notify+0x98/0x270 Code: 79000d0b b9000a6c f940012a f9400269 (b9405d4b) Which I believe disassembles to (I don't know ARM assembly, but it looks sane enough to me...): // halfword (16-bit) store presumably to event->wLength (at offset 6 of struct usb_cdc_notification) 0B 0D 00 79 strh w11, [x8, #6] // word (32-bit) store presumably to req->Length (at offset 8 of struct usb_request) 6C 0A 00 B9 str w12, [x19, #8] // x10 (NULL) was read here from offset 0 of valid pointer x9 // IMHO we're reading 'cdev->gadget' and getting NULL // gadget is indeed at offset 0 of struct usb_composite_dev 2A 01 40 F9 ldr x10, [x9] // loading req->buf pointer, which is at offset 0 of struct usb_request 69 02 40 F9 ldr x9, [x19] // x10 is null, crash, appears to be attempt to read cdev->gadget->max_speed 4B 5D 40 B9 ldr w11, [x10, #0x5c] which seems to line up with ncm_do_notify() case NCM_NOTIFY_SPEED code fragment: event->wLength = cpu_to_le16(8); req->length = NCM_STATUS_BYTECOUNT; /* SPEED_CHANGE data is up/down speeds in bits/sec */ data = req->buf + sizeof *event; data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget)); My analysis of registers and NULL ptr deref crash offset (Unable to handle kernel NULL pointer dereference at virtual address 000000000000005c) heavily suggests that the crash is due to 'cdev->gadget' being NULL when executing: data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget)); which calls: ncm_bitrate(NULL) which then calls: gadget_is_superspeed(NULL) which reads ((struct usb_gadget *)NULL)->max_speed and hits a panic. AFAICT, if I'm counting right, the offset of max_speed is indeed 0x5C. (remember there's a GKI KABI reservation of 16 bytes in struct work_struct) It's not at all clear to me how this is all supposed to work... but returning 0 seems much better than panic-ing...
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < fef6b29671b66dfb71f17e337c1ad14b5a2cedae (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < 63d161f29cd39c050e8873aa36e0c9fc013bb763 (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < a21da7f7aae618c785f7e4a275d43c06dc8412b6 (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < e92c70059178da751e5af7de02384b7dfadb5ec7 (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < a69c8dfb85b44be9cc223be07d35cc3a9baefbea (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < 09e4507ec8ef2d44da6ba4092b8ee2d81f216497 (git)
Affected: 1650113888fe7b7e16604a5019c32dd3ddeb3af2 , < c6ec929595c7443250b2a4faea988c62019d5cd2 (git)
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    Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.14.304 , ≤ 4.14.* (semver)
Unaffected: 4.19.271 , ≤ 4.19.* (semver)
Unaffected: 5.4.230 , ≤ 5.4.* (semver)
Unaffected: 5.10.165 , ≤ 5.10.* (semver)
Unaffected: 5.15.90 , ≤ 5.15.* (semver)
Unaffected: 6.1.8 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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      "title": "usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()",
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    "datePublished": "2024-08-21T06:10:34.120Z",
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    "dateUpdated": "2026-01-05T10:17:52.789Z",
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\"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()\\n\\nIn Google internal bug 265639009 we\u0027ve received an (as yet) unreproducible\\ncrash report from an aarch64 GKI 5.10.149-android13 running device.\\n\\nAFAICT the source code is at:\\n  https://android.googlesource.com/kernel/common/+/refs/tags/ASB-2022-12-05_13-5.10\\n\\nThe call stack is:\\n  ncm_close() -\u003e ncm_notify() -\u003e ncm_do_notify()\\nwith the crash at:\\n  ncm_do_notify+0x98/0x270\\nCode: 79000d0b b9000a6c f940012a f9400269 (b9405d4b)\\n\\nWhich I believe disassembles to (I don\u0027t know ARM assembly, but it looks sane enough to me...):\\n\\n  // halfword (16-bit) store presumably to event-\u003ewLength (at offset 6 of struct usb_cdc_notification)\\n  0B 0D 00 79    strh w11, [x8, #6]\\n\\n  // word (32-bit) store presumably to req-\u003eLength (at offset 8 of struct usb_request)\\n  6C 0A 00 B9    str  w12, [x19, #8]\\n\\n  // x10 (NULL) was read here from offset 0 of valid pointer x9\\n  // IMHO we\u0027re reading \u0027cdev-\u003egadget\u0027 and getting NULL\\n  // gadget is indeed at offset 0 of struct usb_composite_dev\\n  2A 01 40 F9    ldr  x10, [x9]\\n\\n  // loading req-\u003ebuf pointer, which is at offset 0 of struct usb_request\\n  69 02 40 F9    ldr  x9, [x19]\\n\\n  // x10 is null, crash, appears to be attempt to read cdev-\u003egadget-\u003emax_speed\\n  4B 5D 40 B9    ldr  w11, [x10, #0x5c]\\n\\nwhich seems to line up with ncm_do_notify() case NCM_NOTIFY_SPEED code fragment:\\n\\n  event-\u003ewLength = cpu_to_le16(8);\\n  req-\u003elength = NCM_STATUS_BYTECOUNT;\\n\\n  /* SPEED_CHANGE data is up/down speeds in bits/sec */\\n  data = req-\u003ebuf + sizeof *event;\\n  data[0] = cpu_to_le32(ncm_bitrate(cdev-\u003egadget));\\n\\nMy analysis of registers and NULL ptr deref crash offset\\n  (Unable to handle kernel NULL pointer dereference at virtual address 000000000000005c)\\nheavily suggests that the crash is due to \u0027cdev-\u003egadget\u0027 being NULL when executing:\\n  data[0] = cpu_to_le32(ncm_bitrate(cdev-\u003egadget));\\nwhich calls:\\n  ncm_bitrate(NULL)\\nwhich then calls:\\n  gadget_is_superspeed(NULL)\\nwhich reads\\n  ((struct usb_gadget *)NULL)-\u003emax_speed\\nand hits a panic.\\n\\nAFAICT, if I\u0027m counting right, the offset of max_speed is indeed 0x5C.\\n(remember there\u0027s a GKI KABI reservation of 16 bytes in struct work_struct)\\n\\nIt\u0027s not at all clear to me how this is all supposed to work...\\nbut returning 0 seems much better than panic-ing...\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.304\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.271\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.230\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.165\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.90\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.8\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:17:52.789Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52894\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:17:52.789Z\", \"dateReserved\": \"2024-08-21T06:07:11.013Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-21T06:10:34.120Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.