Ubuntu: (Multiple Advisories) (CVE-2024-39276): Linux kernel vulnerabilities

Ubuntu: (Multiple Advisories) (CVE-2024-39276): Linux kernel vulnerabilities

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

06/25/2024

Created

08/10/2024

Added

08/09/2024

Modified

09/26/2024

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.

Solution(s)

• ubuntu-upgrade-linux-image-5-15-0-1035-xilinx-zynqmp
• ubuntu-upgrade-linux-image-5-15-0-1052-gkeop
• ubuntu-upgrade-linux-image-5-15-0-1062-ibm
• ubuntu-upgrade-linux-image-5-15-0-1062-raspi
• ubuntu-upgrade-linux-image-5-15-0-1064-intel-iotg
• ubuntu-upgrade-linux-image-5-15-0-1064-nvidia
• ubuntu-upgrade-linux-image-5-15-0-1064-nvidia-lowlatency
• ubuntu-upgrade-linux-image-5-15-0-1066-gke
• ubuntu-upgrade-linux-image-5-15-0-1066-kvm
• ubuntu-upgrade-linux-image-5-15-0-1067-oracle
• ubuntu-upgrade-linux-image-5-15-0-1068-gcp
• ubuntu-upgrade-linux-image-5-15-0-1069-aws
• ubuntu-upgrade-linux-image-5-15-0-1072-azure
• ubuntu-upgrade-linux-image-5-15-0-1072-azure-fde
• ubuntu-upgrade-linux-image-5-15-0-121-generic
• ubuntu-upgrade-linux-image-5-15-0-121-generic-64k
• ubuntu-upgrade-linux-image-5-15-0-121-generic-lpae
• ubuntu-upgrade-linux-image-5-15-0-121-lowlatency
• ubuntu-upgrade-linux-image-5-15-0-121-lowlatency-64k
• ubuntu-upgrade-linux-image-5-4-0-1042-iot
• ubuntu-upgrade-linux-image-5-4-0-1049-xilinx-zynqmp
• ubuntu-upgrade-linux-image-5-4-0-1077-ibm
• ubuntu-upgrade-linux-image-5-4-0-1090-bluefield
• ubuntu-upgrade-linux-image-5-4-0-1097-gkeop
• ubuntu-upgrade-linux-image-5-4-0-1114-raspi
• ubuntu-upgrade-linux-image-5-4-0-1118-kvm
• ubuntu-upgrade-linux-image-5-4-0-1129-oracle
• ubuntu-upgrade-linux-image-5-4-0-1130-aws
• ubuntu-upgrade-linux-image-5-4-0-1134-gcp
• ubuntu-upgrade-linux-image-5-4-0-1135-azure
• ubuntu-upgrade-linux-image-5-4-0-192-generic
• ubuntu-upgrade-linux-image-5-4-0-192-generic-lpae
• ubuntu-upgrade-linux-image-5-4-0-192-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-1010-gke
• ubuntu-upgrade-linux-image-6-8-0-1011-raspi
• ubuntu-upgrade-linux-image-6-8-0-1012-ibm
• ubuntu-upgrade-linux-image-6-8-0-1012-oem
• ubuntu-upgrade-linux-image-6-8-0-1012-oracle
• ubuntu-upgrade-linux-image-6-8-0-1012-oracle-64k
• ubuntu-upgrade-linux-image-6-8-0-1013-nvidia
• ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-64k
• ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency-64k
• ubuntu-upgrade-linux-image-6-8-0-1014-azure
• ubuntu-upgrade-linux-image-6-8-0-1014-azure-fde
• ubuntu-upgrade-linux-image-6-8-0-1014-gcp
• ubuntu-upgrade-linux-image-6-8-0-1015-aws
• ubuntu-upgrade-linux-image-6-8-0-44-generic
• ubuntu-upgrade-linux-image-6-8-0-44-generic-64k
• ubuntu-upgrade-linux-image-6-8-0-44-lowlatency
• ubuntu-upgrade-linux-image-6-8-0-44-lowlatency-64k
• ubuntu-upgrade-linux-image-6-8-0-45-generic
• ubuntu-upgrade-linux-image-6-8-0-45-generic-64k
• ubuntu-upgrade-linux-image-aws
• ubuntu-upgrade-linux-image-aws-lts-20-04
• ubuntu-upgrade-linux-image-aws-lts-22-04
• ubuntu-upgrade-linux-image-azure
• ubuntu-upgrade-linux-image-azure-cvm
• ubuntu-upgrade-linux-image-azure-fde
• ubuntu-upgrade-linux-image-azure-fde-lts-22-04
• ubuntu-upgrade-linux-image-azure-lts-20-04
• ubuntu-upgrade-linux-image-azure-lts-22-04
• ubuntu-upgrade-linux-image-bluefield
• ubuntu-upgrade-linux-image-gcp
• ubuntu-upgrade-linux-image-gcp-lts-20-04
• 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-64k-hwe-22-04
• ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
• ubuntu-upgrade-linux-image-generic-hwe-18-04
• ubuntu-upgrade-linux-image-generic-hwe-20-04
• ubuntu-upgrade-linux-image-generic-hwe-22-04
• ubuntu-upgrade-linux-image-generic-hwe-24-04
• 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-gkeop-5-4
• ubuntu-upgrade-linux-image-ibm
• ubuntu-upgrade-linux-image-ibm-classic
• ubuntu-upgrade-linux-image-ibm-lts-20-04
• ubuntu-upgrade-linux-image-ibm-lts-24-04
• 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-64k-hwe-22-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
• ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
• ubuntu-upgrade-linux-image-nvidia
• ubuntu-upgrade-linux-image-nvidia-6-8
• ubuntu-upgrade-linux-image-nvidia-64k
• ubuntu-upgrade-linux-image-nvidia-64k-6-8
• ubuntu-upgrade-linux-image-nvidia-lowlatency
• ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
• ubuntu-upgrade-linux-image-oem
• 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-oem-22-04
• ubuntu-upgrade-linux-image-oem-22-04a
• ubuntu-upgrade-linux-image-oem-22-04b
• ubuntu-upgrade-linux-image-oem-22-04c
• ubuntu-upgrade-linux-image-oem-22-04d
• ubuntu-upgrade-linux-image-oem-osp1
• ubuntu-upgrade-linux-image-oracle
• ubuntu-upgrade-linux-image-oracle-64k
• ubuntu-upgrade-linux-image-oracle-lts-20-04
• ubuntu-upgrade-linux-image-oracle-lts-22-04
• ubuntu-upgrade-linux-image-raspi
• ubuntu-upgrade-linux-image-raspi-hwe-18-04
• ubuntu-upgrade-linux-image-raspi-nolpae
• ubuntu-upgrade-linux-image-raspi2
• ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
• ubuntu-upgrade-linux-image-virtual
• ubuntu-upgrade-linux-image-virtual-hwe-18-04
• ubuntu-upgrade-linux-image-virtual-hwe-20-04
• ubuntu-upgrade-linux-image-virtual-hwe-22-04
• ubuntu-upgrade-linux-image-virtual-hwe-24-04
• ubuntu-upgrade-linux-image-xilinx-zynqmp

References

• https://attackerkb.com/topics/cve-2024-39276
• CVE - 2024-39276
• USN-6951-1
• USN-6951-2
• USN-6951-3
• USN-6951-4
• USN-6953-1
• USN-6979-1
• USN-6999-1
• USN-6999-2
• USN-7004-1
• USN-7005-1
• USN-7005-2
• USN-7007-1
• USN-7007-2
• USN-7007-3
• USN-7008-1
• USN-7009-1
• USN-7009-2
• USN-7019-1
• USN-7029-1

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