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

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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
08/15/2024

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-5-4-0-1042-iot
  • ubuntu-upgrade-linux-image-5-4-0-1049-xilinx-zynqmp
  • ubuntu-upgrade-linux-image-5-4-0-1077-ibm
  • ubuntu-upgrade-linux-image-5-4-0-1097-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-aws
  • ubuntu-upgrade-linux-image-aws-lts-20-04
  • ubuntu-upgrade-linux-image-azure-lts-20-04
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-gcp-lts-20-04
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-gkeop
  • ubuntu-upgrade-linux-image-gkeop-5-4
  • ubuntu-upgrade-linux-image-ibm
  • ubuntu-upgrade-linux-image-ibm-lts-20-04
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
  • ubuntu-upgrade-linux-image-oem
  • ubuntu-upgrade-linux-image-oem-osp1
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-oracle-lts-20-04
  • ubuntu-upgrade-linux-image-raspi
  • 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-xilinx-zynqmp

References

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