cve-2022-48838
Vulnerability from cvelistv5
Published
2024-07-16 12:25
Modified
2024-12-19 08:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: Fix use-after-free bug by not setting udc->dev.driver The syzbot fuzzer found a use-after-free bug: BUG: KASAN: use-after-free in dev_uevent+0x712/0x780 drivers/base/core.c:2320 Read of size 8 at addr ffff88802b934098 by task udevd/3689 CPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 dev_uevent+0x712/0x780 drivers/base/core.c:2320 uevent_show+0x1b8/0x380 drivers/base/core.c:2391 dev_attr_show+0x4b/0x90 drivers/base/core.c:2094 Although the bug manifested in the driver core, the real cause was a race with the gadget core. dev_uevent() does: if (dev->driver) add_uevent_var(env, "DRIVER=%s", dev->driver->name); and between the test and the dereference of dev->driver, the gadget core sets dev->driver to NULL. The race wouldn't occur if the gadget core registered its devices on a real bus, using the standard synchronization techniques of the driver core. However, it's not necessary to make such a large change in order to fix this bug; all we need to do is make sure that udc->dev.driver is always NULL. In fact, there is no reason for udc->dev.driver ever to be set to anything, let alone to the value it currently gets: the address of the gadget's driver. After all, a gadget driver only knows how to manage a gadget, not how to manage a UDC. This patch simply removes the statements in the gadget core that touch udc->dev.driver.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3Patch
Impacted products
Vendor Product Version
Linux Linux Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
Version: 2ccea03a8f7ec93641791f2760d7cdc6cab6205f
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      nvd: "{\"cve\":{\"id\":\"CVE-2022-48838\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T13:15:11.280\",\"lastModified\":\"2024-11-21T07:34:11.053\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: Fix use-after-free bug by not setting udc->dev.driver\\n\\nThe syzbot fuzzer found a use-after-free bug:\\n\\nBUG: KASAN: use-after-free in dev_uevent+0x712/0x780 drivers/base/core.c:2320\\nRead of size 8 at addr ffff88802b934098 by task udevd/3689\\n\\nCPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014\\nCall Trace:\\n <TASK>\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\\n print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255\\n __kasan_report mm/kasan/report.c:442 [inline]\\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:459\\n dev_uevent+0x712/0x780 drivers/base/core.c:2320\\n uevent_show+0x1b8/0x380 drivers/base/core.c:2391\\n dev_attr_show+0x4b/0x90 drivers/base/core.c:2094\\n\\nAlthough the bug manifested in the driver core, the real cause was a\\nrace with the gadget core.  dev_uevent() does:\\n\\n\\tif (dev->driver)\\n\\t\\tadd_uevent_var(env, \\\"DRIVER=%s\\\", dev->driver->name);\\n\\nand between the test and the dereference of dev->driver, the gadget\\ncore sets dev->driver to NULL.\\n\\nThe race wouldn't occur if the gadget core registered its devices on\\na real bus, using the standard synchronization techniques of the\\ndriver core.  However, it's not necessary to make such a large change\\nin order to fix this bug; all we need to do is make sure that\\nudc->dev.driver is always NULL.\\n\\nIn fact, there is no reason for udc->dev.driver ever to be set to\\nanything, let alone to the value it currently gets: the address of the\\ngadget's driver.  After all, a gadget driver only knows how to manage\\na gadget, not how to manage a UDC.\\n\\nThis patch simply removes the statements in the gadget core that touch\\nudc->dev.driver.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: corrige el error de use-after-free al no configurar udc-&gt;dev.driver El syzbot fuzzer encontró un error de use-after-free: ERROR: KASAN: uso- after-free en dev_uevent+0x712/0x780 drivers/base/core.c:2320 Lectura de tamaño 8 en addr ffff88802b934098 por tarea udevd/3689 CPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229 -g4f12b742eb2b #0 Nombre del hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS 1.14.0-2 01/04/2014 Seguimiento de llamadas:  __dump_stack lib/dump_stack.c:88 [en línea] dump_stack_lvl+0xcd/ 0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [en línea] kasan_report.cold+0x83/0xdf mm/ kasan/report.c:459 dev_uevent+0x712/0x780 drivers/base/core.c:2320 uevent_show+0x1b8/0x380 drivers/base/core.c:2391 dev_attr_show+0x4b/0x90 drivers/base/core.c:2094 Aunque El error se manifestó en el núcleo del controlador, la verdadera causa fue una ejecución con el núcleo del dispositivo. dev_uevent() hace: if (dev-&gt;driver) add_uevent_var(env, \\\"DRIVER=%s\\\", dev-&gt;driver-&gt;name); y entre la prueba y la desreferencia de dev-&gt;driver, el núcleo del gadget establece dev-&gt;driver en NULL. La ejecución no ocurriría si el núcleo del dispositivo registrara sus dispositivos en un autobús real, utilizando las técnicas de sincronización estándar del núcleo del conductor. Sin embargo, no es necesario realizar un cambio tan grande para corregir este error; todo lo que tenemos que hacer es asegurarnos de que udc-&gt;dev.driver sea siempre NULL. De hecho, no hay ninguna razón para que udc-&gt;dev.driver se establezca en algún momento, y mucho menos en el valor que obtiene actualmente: la dirección del controlador del dispositivo. Después de todo, un controlador de dispositivo sólo sabe cómo administrar un dispositivo, no cómo administrar un UDC. Este parche simplemente elimina las declaraciones en el núcleo del gadget que tocan udc-&gt;dev.driver.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.1\",\"versionEndExcluding\":\"4.9.308\",\"matchCriteriaId\":\"6B0F08D1-9BA3-4198-9925-28CA83858D6E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.273\",\"matchCriteriaId\":\"A1E9CE4F-B0EA-4F88-9562-4F113E598085\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.236\",\"matchCriteriaId\":\"09979837-E01F-4E28-B943-9F680CA3D278\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.187\",\"matchCriteriaId\":\"D9FFB805-4ED2-4FAE-9EF4-8AB4BC9D8F5C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.108\",\"matchCriteriaId\":\"24925527-AC4A-4594-8D6C-3B34D31862C5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.31\",\"matchCriteriaId\":\"F25C317E-A673-47D1-844E-171C9BFDF352\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.17\",\"matchCriteriaId\":\"DC9A634D-C617-4F8C-ADEF-AF94CE69D687\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/00bdd9bf1ac6d401ad926d3d8df41b9f1399f646\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/16b1941eac2bd499f065a6739a40ce0011a3d740\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2015c23610cd0efadaeca4d3a8d1dae9a45aa35a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2282a6eb6d4e118e294e43dcc421e0e0fe4040b5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/27d64436984fb8835a8b7e95993193cc478b162e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4325124dde6726267813c736fee61226f1d38f0b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/609a7119bffe3ddd7c93f2fa65be8917e02a0b7e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e2d3a7009e505e120805f449c832942660f3f7f3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
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of size 8 at addr ffff88802b934098 by task udevd/3689\\n\\nCPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0\\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014\\nCall Trace:\\n <TASK>\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\\n print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255\\n __kasan_report mm/kasan/report.c:442 [inline]\\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:459\\n dev_uevent+0x712/0x780 drivers/base/core.c:2320\\n uevent_show+0x1b8/0x380 drivers/base/core.c:2391\\n dev_attr_show+0x4b/0x90 drivers/base/core.c:2094\\n\\nAlthough the bug manifested in the driver core, the real cause was a\\nrace with the gadget core.  dev_uevent() does:\\n\\n\\tif (dev->driver)\\n\\t\\tadd_uevent_var(env, \\\"DRIVER=%s\\\", dev->driver->name);\\n\\nand between the test and the dereference of dev->driver, the gadget\\ncore sets dev->driver to NULL.\\n\\nThe race wouldn't occur if the gadget core registered its devices on\\na real bus, using the standard synchronization techniques of the\\ndriver core.  However, it's not necessary to make such a large change\\nin order to fix this bug; all we need to do is make sure that\\nudc->dev.driver is always NULL.\\n\\nIn fact, there is no reason for udc->dev.driver ever to be set to\\nanything, let alone to the value it currently gets: the address of the\\ngadget's driver.  After all, a gadget driver only knows how to manage\\na gadget, not how to manage a UDC.\\n\\nThis patch simply removes the statements in the gadget core that touch\\nudc->dev.driver.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:08:42.426Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2022-48838\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:08:42.426Z\", \"dateReserved\": \"2024-07-16T11:38:08.907Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-16T12:25:09.859Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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