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Ubuntu: (CVE-2022-49021): linux vulnerability

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Ubuntu: (CVE-2022-49021): linux vulnerability

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
10/21/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: fix null-ptr-deref while probe() failed I got a null-ptr-deref report as following when doing fault injection test: BUG: kernel NULL pointer dereference, address: 0000000000000058 Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 PID: 253 Comm: 507-spi-dm9051 Tainted: GBN 6.1.0-rc3+ Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:klist_put+0x2d/0xd0 Call Trace: <TASK> klist_remove+0xf1/0x1c0 device_release_driver_internal+0x23e/0x2d0 bus_remove_device+0x1bd/0x240 device_del+0x357/0x770 phy_device_remove+0x11/0x30 mdiobus_unregister+0xa5/0x140 release_nodes+0x6a/0xa0 devres_release_all+0xf8/0x150 device_unbind_cleanup+0x19/0xd0 //probe path: phy_device_register() device_add() phy_connect phy_attach_direct() //set device driver probe() //it's failed, driver is not bound device_bind_driver() // probe failed, it's not called //remove path: phy_device_remove() device_del() device_release_driver_internal() __device_release_driver() //dev->drv is not NULL klist_remove() <- knode_driver is not added yet, cause null-ptr-deref In phy_attach_direct(), after setting the 'dev->driver', probe() fails, device_bind_driver() is not called, so the knode_driver->n_klist is not set, then it causes null-ptr-deref in __device_release_driver() while deleting device. Fix this by setting dev->driver to NULL in the error path in phy_attach_direct().

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-15
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-aws-hwe
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-4-15
  • ubuntu-upgrade-linux-azure-5-15
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fde
  • ubuntu-upgrade-linux-azure-fde-5-15
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-4-15
  • ubuntu-upgrade-linux-gcp-5-15
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gke
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-gkeop-5-15
  • ubuntu-upgrade-linux-hwe
  • ubuntu-upgrade-linux-hwe-5-15
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-ibm
  • ubuntu-upgrade-linux-ibm-5-4
  • ubuntu-upgrade-linux-intel-iot-realtime
  • ubuntu-upgrade-linux-intel-iotg
  • ubuntu-upgrade-linux-intel-iotg-5-15
  • ubuntu-upgrade-linux-iot
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-lowlatency
  • ubuntu-upgrade-linux-lowlatency-hwe-5-15
  • ubuntu-upgrade-linux-nvidia
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-15
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4
  • ubuntu-upgrade-linux-realtime
  • ubuntu-upgrade-linux-riscv-5-15
  • ubuntu-upgrade-linux-xilinx-zynqmp

References

  • https://attackerkb.com/topics/cve-2022-49021
  • CVE - 2022-49021
  • https://git.kernel.org/linus/369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6
  • https://git.kernel.org/stable/c/0744c7be4de564db03e24527b2e096b7e0e20972
  • https://git.kernel.org/stable/c/369eb2c9f1f72adbe91e0ea8efb130f0a2ba11a6
  • https://git.kernel.org/stable/c/3e21f85d87c836462bb52ef2078ea561260935c1
  • https://git.kernel.org/stable/c/51d7f6b20fae8bae64ad1136f1e30d1fd5ba78f7
  • https://git.kernel.org/stable/c/7730904f50c7187dd16c76949efb56b5fb55cd57
  • https://git.kernel.org/stable/c/8aaafe0f71314f46a066382a047ba8bb3840d273
  • https://git.kernel.org/stable/c/eaa5722549ac2604ffa56c2e946acc83226f130c
  • https://git.kernel.org/stable/c/fe6bc99c27c21348f548966118867ed26a9a372c
  • https://www.cve.org/CVERecord?id=CVE-2022-49021
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