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Ubuntu: (Multiple Advisories) (CVE-2024-49883): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2024-49883): Linux kernel vulnerabilities

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
10/21/2024
Created
12/19/2024
Added
12/18/2024
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: aovid use-after-free in ext4_ext_insert_extent() As Ojaswin mentioned in Link, in ext4_ext_insert_extent(), if the path is reallocated in ext4_ext_create_new_leaf(), we'll use the stale path and cause UAF. Below is a sample trace with dummy values: ext4_ext_insert_extent path = *ppath = 2000 ext4_ext_create_new_leaf(ppath) ext4_find_extent(ppath) path = *ppath = 2000 if (depth > path[0].p_maxdepth) kfree(path = 2000); *ppath = path = NULL; path = kcalloc() = 3000 *ppath = 3000; return path; /* here path is still 2000, UAF! */ eh = path[depth].p_hdr ================================================================== BUG: KASAN: slab-use-after-free in ext4_ext_insert_extent+0x26d4/0x3330 Read of size 8 at addr ffff8881027bf7d0 by task kworker/u36:1/179 CPU: 3 UID: 0 PID: 179 Comm: kworker/u6:1 Not tainted 6.11.0-rc2-dirty #866 Call Trace: <TASK> ext4_ext_insert_extent+0x26d4/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 [...] Allocated by task 179: ext4_find_extent+0x81c/0x1f70 ext4_ext_map_blocks+0x146/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] Freed by task 179: kfree+0xcb/0x240 ext4_find_extent+0x7c0/0x1f70 ext4_ext_insert_extent+0xa26/0x3330 ext4_ext_map_blocks+0xe22/0x2d40 ext4_map_blocks+0x71e/0x1700 ext4_do_writepages+0x1290/0x2800 ext4_writepages+0x26d/0x4e0 do_writepages+0x175/0x700 [...] ================================================================== So use *ppath to update the path to avoid the above problem.

Solution(s)

  • ubuntu-upgrade-linux-image-5-15-0-1039-xilinx-zynqmp
  • ubuntu-upgrade-linux-image-5-15-0-1056-gkeop
  • ubuntu-upgrade-linux-image-5-15-0-1066-ibm
  • ubuntu-upgrade-linux-image-5-15-0-1066-raspi
  • ubuntu-upgrade-linux-image-5-15-0-1068-nvidia
  • ubuntu-upgrade-linux-image-5-15-0-1068-nvidia-lowlatency
  • ubuntu-upgrade-linux-image-5-15-0-1070-gke
  • ubuntu-upgrade-linux-image-5-15-0-1070-kvm
  • ubuntu-upgrade-linux-image-5-15-0-1071-intel-iotg
  • ubuntu-upgrade-linux-image-5-15-0-1071-oracle
  • ubuntu-upgrade-linux-image-5-15-0-1072-gcp
  • ubuntu-upgrade-linux-image-5-15-0-1073-aws
  • ubuntu-upgrade-linux-image-5-15-0-1078-azure
  • ubuntu-upgrade-linux-image-5-15-0-127-generic
  • ubuntu-upgrade-linux-image-5-15-0-127-generic-64k
  • ubuntu-upgrade-linux-image-5-15-0-127-generic-lpae
  • ubuntu-upgrade-linux-image-5-15-0-127-lowlatency
  • ubuntu-upgrade-linux-image-5-15-0-127-lowlatency-64k
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-aws-lts-22-04
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-azure-cvm
  • ubuntu-upgrade-linux-image-azure-lts-22-04
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-gcp-lts-22-04
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-gke-5-15
  • ubuntu-upgrade-linux-image-gkeop
  • ubuntu-upgrade-linux-image-gkeop-5-15
  • ubuntu-upgrade-linux-image-ibm
  • ubuntu-upgrade-linux-image-intel
  • ubuntu-upgrade-linux-image-intel-iotg
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-64k
  • ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-nvidia
  • ubuntu-upgrade-linux-image-nvidia-lowlatency
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04b
  • ubuntu-upgrade-linux-image-oem-20-04c
  • ubuntu-upgrade-linux-image-oem-20-04d
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-oracle-lts-22-04
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04
  • ubuntu-upgrade-linux-image-xilinx-zynqmp

References

  • https://attackerkb.com/topics/cve-2024-49883
  • CVE - 2024-49883
  • USN-7166-1
  • USN-7166-2
  • USN-7166-3
  • USN-7166-4
  • USN-7186-1
  • USN-7186-2
  • USN-7194-1
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