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bdu:2025-12822

BELL-CVE-2023-53503

Affected: Alpaquita:stream: linux-lts

EUVD-2026-312097

fkie_cve-2023-53503

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

ext4: allow ext4_get_group_info() to fail

Previously, ext4_get_group_info() would treat an invalid group number as BUG(), since in theory it should never happen. However, if a malicious attaker (or fuzzer) modifies the superblock via the block device while it is the file system is mounted, it is possible for s_first_data_block to get set to a very large number. In that case, when calculating the block group of some block number (such as the starting block of a preallocation region), could result in an underflow and very large block group number. Then the BUG_ON check in ext4_get_group_info() would fire, resutling in a denial of service attack that can be triggered by root or someone with write access to the block device.

For a quality of implementation perspective, it's best that even if the system administrator does something that they shouldn't, that it will not trigger a BUG. So instead of BUG'ing, ext4_get_group_info() will call ext4_error and return NULL. We also add fallback code in all of the callers of ext4_get_group_info() that it might NULL.

Also, since ext4_get_group_info() was already borderline to be an inline function, un-inline it. The results in a next reduction of the compiled text size of ext4 by roughly 2k.

GHSA-794g-3p8m-5jpc

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

ext4: allow ext4_get_group_info() to fail

Also, since ext4_get_group_info() was already borderline to be an inline function, un-inline it. The results in a next reduction of the compiled text size of ext4 by roughly 2k.

RHSA-2024:10771 — Red Hat Security Advisory: kernel security update

kernel: vt_ioctl: fix array_index_nospec in vt_setactivate kernel: pstore/ram: Fix crash when setting number of cpus to an odd number kernel: PM / devfreq: Synchronize devfreq_monitor_[start/stop] kernel: net/smc: avoid data corruption caused by decline kernel: scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool kernel: ext4: allow ext4_get_group_info() to fail kernel: ext4: correct grp validation in ext4_mb_good_group kernel: ext4: regenerate buddy after block freeing failed if under fc replay kernel: net/smc: fix illegal rmb_desc access in SMC-D connection dump kernel: fs/proc: do_task_stat: use sig->stats_lock to gather the threads/children stats kernel: ext4: fix double-free of blocks due to wrong extents moved_len kernel: Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout kernel: s390/qeth: Fix kernel panic after setting hsuid kernel: drm/vmwgfx: Fix invalid reads in fence signaled events kernel: blk-cgroup: fix list corruption from reorder of WRITE ->lqueued kernel: of: module: add buffer overflow check in of_modalias() kernel: net/mlx5: Discard command completions in internal error kernel: net: hns3: fix kernel crash problem in concurrent scenario kernel: cpufreq: amd-pstate: fix memory leak on CPU EPP exit kernel: tcp: avoid too many retransmit packets kernel: drm/amdgpu: change vm->task_info handling kernel: bpf: Fix overrunning reservations in ringbuf kernel: mm/filemap: skip to create PMD-sized page cache if needed kernel: firmware: cs_dsp…

UBUNTU-CVE-2023-53503

Affected: Ubuntu:Pro:14.04:LTS: linux, Ubuntu:Pro:14.04:LTS: linux-aws, Ubuntu:Pro:14.04:LTS: linux-azure, Ubuntu:Pro:14.04:LTS: linux-lts-xenial, Ubuntu:Pro:16.04:LTS: linux, Ubuntu:Pro:16.04:LTS: linux-aws, Ubuntu:Pro:16.04:LTS: linux-aws-hwe, Ubuntu:Pro:16.04:LTS: linux-azure, Ubuntu:Pro:16.04:LTS: linux-gcp, Ubuntu:Pro:16.04:LTS: linux-hwe and 163 more

In the Linux kernel, the following vulnerability has been resolved: ext4: allow ext4_get_group_info() to fail Previously, ext4_get_group_info() would treat an invalid group number as BUG(), since in theory it should never happen. However, if a malicious attaker (or fuzzer) modifies the superblock via the block device while it is the file system is mounted, it is possible for s_first_data_block to get set to a very large number. In that case, when calculating the block group of some block number (such as the starting block of a preallocation region), could result in an underflow and very large block group number. Then the BUG_ON check in ext4_get_group_info() would fire, resutling in a denial of service attack that can be triggered by root or someone with write access to the block device. For a quality of implementation perspective, it's best that even if the system administrator does something that they shouldn't, that it will not trigger a BUG. So instead of BUG'ing, ext4_get_group_info() will call ext4_error and return NULL. We also add fallback code in all of the callers of ext4_get_group_info() that it might NULL. Also, since ext4_get_group_info() was already borderline to be an inline function, un-inline it. The results in a next reduction of the compiled text size of ext4 by roughly 2k.

WID-SEC-W-2025-2187 — Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen und um nicht nähere beschriebene Effekte zu verursachen.