vulnerability

Ubuntu: (Multiple Advisories) (CVE-2025-21887): Linux kernel vulnerabilities

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
Mar 27, 2025
Added
May 20, 2025
Modified
Jun 3, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

The issue was caused by dput(upper) being called before
ovl_dentry_update_reval(), while upper->d_flags was still
accessed in ovl_dentry_remote().

Move dput(upper) after its last use to prevent use-after-free.

BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]
BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167

Call Trace:

__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
ovl_dentry_remote fs/overlayfs/util.c:162 [inline]
ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167
ovl_link_up fs/overlayfs/copy_up.c:610 [inline]
ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170
ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223
ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136
vfs_rename+0xf84/0x20a0 fs/namei.c:4893
...

Solution(s)

ubuntu-upgrade-linux-image-5-15-0-1026-nvidia-tegra-igxubuntu-upgrade-linux-image-5-15-0-1026-nvidia-tegra-igx-rtubuntu-upgrade-linux-image-5-15-0-1037-nvidia-tegraubuntu-upgrade-linux-image-5-15-0-1037-nvidia-tegra-rtubuntu-upgrade-linux-image-5-15-0-1066-gkeopubuntu-upgrade-linux-image-5-15-0-1076-ibmubuntu-upgrade-linux-image-5-15-0-1077-intel-iot-realtimeubuntu-upgrade-linux-image-5-15-0-1078-nvidiaubuntu-upgrade-linux-image-5-15-0-1078-nvidia-lowlatencyubuntu-upgrade-linux-image-5-15-0-1078-raspiubuntu-upgrade-linux-image-5-15-0-1079-intel-iotgubuntu-upgrade-linux-image-5-15-0-1080-kvmubuntu-upgrade-linux-image-5-15-0-1081-gkeubuntu-upgrade-linux-image-5-15-0-1081-oracleubuntu-upgrade-linux-image-5-15-0-1083-gcpubuntu-upgrade-linux-image-5-15-0-1083-gcp-fipsubuntu-upgrade-linux-image-5-15-0-1084-awsubuntu-upgrade-linux-image-5-15-0-1084-aws-fipsubuntu-upgrade-linux-image-5-15-0-1084-realtimeubuntu-upgrade-linux-image-5-15-0-1089-azureubuntu-upgrade-linux-image-5-15-0-1089-azure-fipsubuntu-upgrade-linux-image-5-15-0-140-fipsubuntu-upgrade-linux-image-5-15-0-140-genericubuntu-upgrade-linux-image-5-15-0-140-generic-64kubuntu-upgrade-linux-image-5-15-0-140-generic-lpaeubuntu-upgrade-linux-image-5-15-0-140-lowlatencyubuntu-upgrade-linux-image-5-15-0-140-lowlatency-64kubuntu-upgrade-linux-image-6-11-0-1010-realtimeubuntu-upgrade-linux-image-6-11-0-1013-raspiubuntu-upgrade-linux-image-6-11-0-1014-awsubuntu-upgrade-linux-image-6-11-0-1014-lowlatencyubuntu-upgrade-linux-image-6-11-0-1014-lowlatency-64kubuntu-upgrade-linux-image-6-11-0-1015-azureubuntu-upgrade-linux-image-6-11-0-1015-azure-fdeubuntu-upgrade-linux-image-6-11-0-1015-gcpubuntu-upgrade-linux-image-6-11-0-1015-gcp-64kubuntu-upgrade-linux-image-6-11-0-1016-oracleubuntu-upgrade-linux-image-6-11-0-1016-oracle-64kubuntu-upgrade-linux-image-6-11-0-1022-oemubuntu-upgrade-linux-image-6-11-0-26-genericubuntu-upgrade-linux-image-6-11-0-26-generic-64kubuntu-upgrade-linux-image-awsubuntu-upgrade-linux-image-aws-fipsubuntu-upgrade-linux-image-aws-lts-22-04ubuntu-upgrade-linux-image-azureubuntu-upgrade-linux-image-azure-cvmubuntu-upgrade-linux-image-azure-fdeubuntu-upgrade-linux-image-azure-fipsubuntu-upgrade-linux-image-azure-lts-22-04ubuntu-upgrade-linux-image-fipsubuntu-upgrade-linux-image-gcpubuntu-upgrade-linux-image-gcp-64kubuntu-upgrade-linux-image-gcp-fipsubuntu-upgrade-linux-image-gcp-lts-22-04ubuntu-upgrade-linux-image-genericubuntu-upgrade-linux-image-generic-64kubuntu-upgrade-linux-image-generic-64k-hwe-24-04ubuntu-upgrade-linux-image-generic-hwe-24-04ubuntu-upgrade-linux-image-generic-lpaeubuntu-upgrade-linux-image-gkeubuntu-upgrade-linux-image-gke-5-15ubuntu-upgrade-linux-image-gkeopubuntu-upgrade-linux-image-gkeop-5-15ubuntu-upgrade-linux-image-ibmubuntu-upgrade-linux-image-intelubuntu-upgrade-linux-image-intel-iot-realtimeubuntu-upgrade-linux-image-intel-iotgubuntu-upgrade-linux-image-kvmubuntu-upgrade-linux-image-lowlatencyubuntu-upgrade-linux-image-lowlatency-64kubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04ubuntu-upgrade-linux-image-lowlatency-hwe-20-04ubuntu-upgrade-linux-image-lowlatency-hwe-24-04ubuntu-upgrade-linux-image-nvidiaubuntu-upgrade-linux-image-nvidia-lowlatencyubuntu-upgrade-linux-image-nvidia-tegraubuntu-upgrade-linux-image-nvidia-tegra-igxubuntu-upgrade-linux-image-nvidia-tegra-igx-rtubuntu-upgrade-linux-image-nvidia-tegra-rtubuntu-upgrade-linux-image-oem-24-04bubuntu-upgrade-linux-image-oracleubuntu-upgrade-linux-image-oracle-64kubuntu-upgrade-linux-image-oracle-lts-22-04ubuntu-upgrade-linux-image-raspiubuntu-upgrade-linux-image-raspi-nolpaeubuntu-upgrade-linux-image-realtimeubuntu-upgrade-linux-image-virtualubuntu-upgrade-linux-image-virtual-hwe-24-04
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