CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2023-52894 – usb: gadget: f_ncm: fix potential NULL ptr deref in ncm_bitrate()
https://notcve.org/view.php?id=CVE-2023-52894
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... • https://git.kernel.org/stable/c/fef6b29671b66dfb71f17e337c1ad14b5a2cedae https://git.kernel.org/stable/c/63d161f29cd39c050e8873aa36e0c9fc013bb763 https://git.kernel.org/stable/c/a21da7f7aae618c785f7e4a275d43c06dc8412b6 https://git.kernel.org/stable/c/e92c70059178da751e5af7de02384b7dfadb5ec7 https://git.kernel.org/stable/c/a69c8dfb85b44be9cc223be07d35cc3a9baefbea https://git.kernel.org/stable/c/09e4507ec8ef2d44da6ba4092b8ee2d81f216497 https://git.kernel.org/stable/c/c6ec929595c7443250b2a4faea988c62019d5cd2 •
CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2023-52893 – gsmi: fix null-deref in gsmi_get_variable
https://notcve.org/view.php?id=CVE-2023-52893
In the Linux kernel, the following vulnerability has been resolved: gsmi: fix null-deref in gsmi_get_variable We can get EFI variables without fetching the attribute, so we must allow for that in gsmi. commit 859748255b43 ("efi: pstore: Omit efivars caching EFI varstore access layer") added a new get_variable call with attr=NULL, which triggers panic in gsmi. • https://git.kernel.org/stable/c/74c5b31c6618f01079212332b2e5f6c42f2d6307 https://git.kernel.org/stable/c/ee5763ef829bd923033510de6d1df7c73f085e4b https://git.kernel.org/stable/c/32313c11bdc8a02c577abaf865be3664ab30410a https://git.kernel.org/stable/c/ffef77794fb5f1245c3249b86342bad2299accb5 https://git.kernel.org/stable/c/ae2a9dcc8caa60b1e14671294e5ec902ea5d1dfd https://git.kernel.org/stable/c/eb0421d90f916dffe96b4c049ddf01c0c50620d2 https://git.kernel.org/stable/c/6646d769fdb0ce4318ef9afd127f8526d1ca8393 https://git.kernel.org/stable/c/a769b05eeed7accc4019a1ed9799dd720 •
CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2022-48899 – drm/virtio: Fix GEM handle creation UAF
https://notcve.org/view.php?id=CVE-2022-48899
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: Fix GEM handle creation UAF Userspace can guess the handle value and try to race GEM object creation with handle close, resulting in a use-after-free if we dereference the object after dropping the handle's reference. For that reason, dropping the handle's reference must be done *after* we are done dereferencing the object. • https://git.kernel.org/stable/c/62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 https://git.kernel.org/stable/c/19ec87d06acfab2313ee82b2a689bf0c154e57ea https://git.kernel.org/stable/c/d01d6d2b06c0d8390adf8f3ba08aa60b5642ef73 https://git.kernel.org/stable/c/68bcd063857075d2f9edfed6024387ac377923e2 https://git.kernel.org/stable/c/011ecdbcd520c90c344b872ca6b4821f7783b2f8 https://git.kernel.org/stable/c/adc48e5e408afbb01d261bd303fd9fbbbaa3e317 https://git.kernel.org/stable/c/52531258318ed59a2dc5a43df2eaf0eb1d65438e •
CVSS: -EPSS: 0%CPEs: 5EXPL: 0CVE-2022-48896 – ixgbe: fix pci device refcount leak
https://notcve.org/view.php?id=CVE-2022-48896
In the Linux kernel, the following vulnerability has been resolved: ixgbe: fix pci device refcount leak As the comment of pci_get_domain_bus_and_slot() says, it returns a PCI device with refcount incremented, when finish using it, the caller must decrement the reference count by calling pci_dev_put(). In ixgbe_get_first_secondary_devfn() and ixgbe_x550em_a_has_mii(), pci_dev_put() is called to avoid leak. • https://git.kernel.org/stable/c/8fa10ef01260937eb540b4e9bbc3efa023595993 https://git.kernel.org/stable/c/53cefa802f070d46c0c518f4865be2c749818a18 https://git.kernel.org/stable/c/112df4cd2b09acd64bcd18f5ef83ba5d07b34bf0 https://git.kernel.org/stable/c/4c93422a54cd6a349988f42e1c6bf082cf4ea9d8 https://git.kernel.org/stable/c/c49996c6aa03590e4ef5add8772cb6068d99fd59 https://git.kernel.org/stable/c/b93fb4405fcb5112c5739c5349afb52ec7f15c07 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2022-48893 – drm/i915/gt: Cleanup partial engine discovery failures
https://notcve.org/view.php?id=CVE-2022-48893
In the Linux kernel, the following vulnerability has been resolved: drm/i915/gt: Cleanup partial engine discovery failures If we abort driver initialisation in the middle of gt/engine discovery, some engines will be fully setup and some not. Those incompletely setup engines only have 'engine->release == NULL' and so will leak any of the common objects allocated. v2: - Drop the destroy_pinned_context() helper for now. It's not really worth it with just a single callsite at the moment. (Janusz) • https://git.kernel.org/stable/c/5c855bcc730656c4b7d30aaddcd0eafc7003e112 https://git.kernel.org/stable/c/78a033433a5ae4fee85511ee075bc9a48312c79e •