UBUNTU-CVE-2023-52438: Use After Free

Published Feb 20, 2024
·
Updated

In the Linux kernel, the following vulnerability has been resolved: binder: fix use-after-free in shinker's callback The mmap read lock is used during the shrinker's callback, which means that using alloc->vma pointer isn't safe as it can race with munmap(). As of commit dd2283f2605e ("mm: mmap: zap pages with read mmapsem in munmap") the mmap lock is downgraded after the vma has been isolated. I was able to reproduce this issue by manually adding some delays and triggering page reclaiming through the shrinker's debug sysfs. The following KASAN report confirms the UAF: ================================================================== BUG: KASAN: slab-use-after-free in zappagerangesingle+0x470/0x4b8 Read of size 8 at addr ffff356ed50e50f0 by task bash/478 CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70 Hardware name: linux,dummy-virt (DT) Call trace: zappagerangesingle+0x470/0x4b8 binderallocfreepage+0x608/0xadc listlruwalkone+0x130/0x3b0 listlruwalknode+0xc4/0x22c bindershrinkscan+0x108/0x1dc shrinkerdebugfsscanwrite+0x2b4/0x500 fullproxywrite+0xd4/0x140 vfswrite+0x1ac/0x758 ksyswrite+0xf0/0x1dc arm64syswrite+0x6c/0x9c Allocated by task 492: kmemcachealloc+0x130/0x368 vmareaalloc+0x2c/0x190 mmapregion+0x258/0x18bc dommap+0x694/0xa60 vmmmappgoff+0x170/0x29c ksysmmappgoff+0x290/0x3a0 arm64sysmmap+0xcc/0x144 Freed by task 491: kmemcachefree+0x17c/0x3c8 vmareafreercucb+0x74/0x98 rcucore+0xa38/0x26d4 rcucoresi+0x10/0x1c dosoftirq+0x2fc/0xd24 Last potentially related work creation: callrcucommon.constprop.0+0x6c/0xba0 callrcu+0x10/0x1c vmareafree+0x18/0x24 removevma+0xe4/0x118 dovmialignmunmap.isra.0+0x718/0xb5c dovmimunmap+0xdc/0x1fc vmmunmap+0x10c/0x278 arm64sysmunmap+0x58/0x7c Fix this issue by performing instead a vmalookup() which will fail to find the vma that was isolated before the mmap lock downgrade. Note that this option has better performance than upgrading to a mmap write lock which would increase contention. Plus, mmapwritetrylock() has been recently removed anyway.

Affected Software

142 affected componentsFixes available
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-aws-5.4<5.4.0-1122.132~18.04.1
5.4.0-1122.132~18.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-5.4<5.4.0-1127.134~18.04.1
5.4.0-1127.134~18.04.1
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gcp-5.4<5.4.0-1126.135~18.04.1
5.4.0-1126.135~18.04.1
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-5.4<5.4.0-175.195~18.04.1
5.4.0-175.195~18.04.1
ubuntu/linux-hwe-edge*
ubuntu/linux-ibm-5.4<5.4.0-1069.74~18.04.1
5.4.0-1069.74~18.04.1
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-oracle-5.4<5.4.0-1121.130~18.04.1
5.4.0-1121.130~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1106.118~18.04.1
5.4.0-1106.118~18.04.1
ubuntu/linux<5.4.0-176.196
5.4.0-176.196
ubuntu/linux-aws<5.4.0-1122.132
5.4.0-1122.132
ubuntu/linux-aws-5.15<5.15.0-1057.63~20.04.1
5.15.0-1057.63~20.04.1
ubuntu/linux-azure<5.4.0-1127.134
5.4.0-1127.134
ubuntu/linux-azure-5.15<5.15.0-1060.69~20.04.1
5.15.0-1060.69~20.04.1
ubuntu/linux-bluefield<5.4.0-1082.89
5.4.0-1082.89
ubuntu/linux-gcp<5.4.0-1126.135
5.4.0-1126.135
ubuntu/linux-gcp-5.15<5.15.0-1055.63~20.04.1
5.15.0-1055.63~20.04.1
ubuntu/linux-gkeop<5.4.0-1089.93
5.4.0-1089.93
ubuntu/linux-gkeop-5.15<5.15.0-1040.46~20.04.1
5.15.0-1040.46~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-102.112~20.04.1
5.15.0-102.112~20.04.1
ubuntu/linux-ibm<5.4.0-1069.74
5.4.0-1069.74
ubuntu/linux-ibm-5.15<5.15.0-1050.53~20.04.1
5.15.0-1050.53~20.04.1
ubuntu/linux-intel-iotg-5.15<5.15.0-1052.58~20.04.1
5.15.0-1052.58~20.04.1
ubuntu/linux-iot<5.4.0-1034.35
5.4.0-1034.35
ubuntu/linux-kvm<5.4.0-1110.117
5.4.0-1110.117
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-102.112~20.04.1
5.15.0-102.112~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1025.25~20.04.1
5.15.0-1025.25~20.04.1
ubuntu/linux-oracle<5.4.0-1121.130
5.4.0-1121.130
ubuntu/linux-oracle-5.15<5.15.0-1055.61~20.04.1
5.15.0-1055.61~20.04.1
ubuntu/linux-raspi<5.4.0-1106.118
5.4.0-1106.118
ubuntu/linux-riscv-5.15<5.15.0-1053.57~20.04.1
5.15.0-1053.57~20.04.1
ubuntu/linux-xilinx-zynqmp<5.4.0-1041.45
5.4.0-1041.45
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1122.132+fips1
5.4.0-1122.132+fips1
ubuntu/linux-azure-fips<5.4.0-1127.134+fips1
5.4.0-1127.134+fips1
ubuntu/linux-fips<5.4.0-1096.106
5.4.0-1096.106
ubuntu/linux-gcp-fips<5.4.0-1126.135+fips1
5.4.0-1126.135+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-102.112
5.15.0-102.112
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1057.63
5.15.0-1057.63
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure<5.15.0-1060.69
5.15.0-1060.69
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde<5.15.0-1060.69.1
5.15.0-1060.69.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1055.63
5.15.0-1055.63
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gke<5.15.0-1054.59
5.15.0-1054.59
ubuntu/linux-gkeop<5.15.0-1040.46
5.15.0-1040.46
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-ibm<5.15.0-1050.53
5.15.0-1050.53
ubuntu/linux-intel-iotg<5.15.0-1052.58
5.15.0-1052.58
ubuntu/linux-kvm<5.15.0-1054.59
5.15.0-1054.59
ubuntu/linux-lowlatency<5.15.0-102.112
5.15.0-102.112
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia<5.15.0-1048.48
5.15.0-1048.48
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5<6.5.0-1014.14
6.5.0-1014.14
ubuntu/linux-nvidia-tegra<5.15.0-1025.25
5.15.0-1025.25
ubuntu/linux-nvidia-tegra-igx<5.15.0-1012.12
5.15.0-1012.12
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1<6.1.0-1035.35
6.1.0-1035.35
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1055.61
5.15.0-1055.61
ubuntu/linux-oracle-6.5*
ubuntu/linux-raspi<5.15.0-1050.53
5.15.0-1050.53
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp<5.15.0-1030.34
5.15.0-1030.34
ubuntu/linux-bluefield<5.15.0-1040.42
5.15.0-1040.42
ubuntu/linux-intel-iot-realtime<5.15.0-1050.52
5.15.0-1050.52
ubuntu/linux-realtime<5.15.0-1058.66
5.15.0-1058.66
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips<5.15.0-1057.63+fips1
5.15.0-1057.63+fips1
ubuntu/linux-azure-fips<5.15.0-1060.69+fips1
5.15.0-1060.69+fips1
ubuntu/linux-fips<5.15.0-102.112+fips1
5.15.0-102.112+fips1
ubuntu/linux-gcp-fips<5.15.0-1055.63+fips2
5.15.0-1055.63+fips2
ubuntu/linux-raspi-realtime<6.8.0-2001.1
6.8.0-2001.1
ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1122.132~18.04.1
  2. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1127.134~18.04.1
  3. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1126.135~18.04.1
  4. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-175.195~18.04.1
  5. Upgrade

    Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.74~18.04.1
  6. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1121.130~18.04.1
  7. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1106.118~18.04.1
  8. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.4.0-176.196
  9. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.4.0-1122.132
  10. Upgrade

    Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1057.63~20.04.1
  11. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.4.0-1127.134
  12. Upgrade

    Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1060.69~20.04.1
  13. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.4.0-1082.89
  14. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1126.135
  15. Upgrade

    Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1055.63~20.04.1
  16. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.4.0-1089.93
  17. Upgrade

    Upgrade ubuntu/linux-gkeop-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.46~20.04.1
  18. Upgrade

    Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-102.112~20.04.1
  19. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1069.74
  20. Upgrade

    Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.53~20.04.1
  21. Upgrade

    Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1052.58~20.04.1
  22. Upgrade

    Upgrade ubuntu/linux-iot to a version that resolves this vulnerability.

    Fixed in 5.4.0-1034.35
  23. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.4.0-1110.117
  24. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-102.112~20.04.1
  25. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1025.25~20.04.1
  26. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.4.0-1121.130
  27. Upgrade

    Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1055.61~20.04.1
  28. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.4.0-1106.118
  29. Upgrade

    Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1053.57~20.04.1
  30. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.4.0-1041.45
  31. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1122.132+fips1
  32. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1127.134+fips1
  33. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1096.106
  34. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.4.0-1126.135+fips1
  35. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.15.0-102.112
  36. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.15.0-1057.63
  37. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.15.0-1060.69
  38. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 5.15.0-1060.69.1
  39. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1055.63
  40. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.15.0-1054.59
  41. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.46
  42. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.53
  43. Upgrade

    Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.

    Fixed in 5.15.0-1052.58
  44. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1054.59
  45. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.15.0-102.112
  46. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 5.15.0-1048.48
  47. Upgrade

    Upgrade ubuntu/linux-nvidia-6.5 to a version that resolves this vulnerability.

    Fixed in 6.5.0-1014.14
  48. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 5.15.0-1025.25
  49. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.

    Fixed in 5.15.0-1012.12
  50. Upgrade

    Upgrade ubuntu/linux-oem-6.1 to a version that resolves this vulnerability.

    Fixed in 6.1.0-1035.35
  51. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.15.0-1055.61
  52. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.53
  53. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1030.34
  54. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.42
  55. Upgrade

    Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1050.52
  56. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1058.66
  57. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1057.63+fips1
  58. Upgrade

    Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1060.69+fips1
  59. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-102.112+fips1
  60. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 5.15.0-1055.63+fips2
  61. Upgrade

    Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.

    Fixed in 6.8.0-2001.1
  62. Compensating control

    In the binder shrinker's callback, perform a vma_lookup() after the mmap lock downgrade instead of using the alloc->vma pointer; the lookup must fail for a VMA isolated before the downgrade, preventing the use-after-free.

Event History

Feb 20, 2024
CVE Published
via OSV·09:15 PM
Data Sourced
via OSV·09:15 PM
DescriptionSeverityAffected Software

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203