CVE-2024-50229

MEDIUM EPSS 10.8%
Published Nov 9, 20241y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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Published Nov 9, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential deadlock with newly created symlinks Syzbot reported that page_symlink(), called by nilfs_symlink(), triggers memory reclamation involving the filesystem layer, which can result in circular lock dependencies among the reader/writer semaphore nilfs->ns_segctor_sem, s_writers percpu_rwsem (intwrite) and the fs_reclaim pseudo lock. This is because after commit 21fc61c73c39 ("don't put symlink bodies in pagecache into highmem"), the gfp flags of the page cache for symbolic links are overwritten to GFP_KERNEL via inode_nohighmem(). This is not a problem for symlinks read from the backing device, because the __GFP_FS flag is dropped after inode_nohighmem() is called. However, when a new symlink is created with nilfs_symlink(), the gfp flags remain overwritten to GFP_KERNEL. Then, memory allocation called from page_symlink() etc. triggers memory reclamation including the FS layer, which may call nilfs_evict_inode() or nilfs_dirty_inode(). And these can cause a deadlock if they are called while nilfs->ns_segctor_sem is held: Fix this issue by dropping the __GFP_FS flag from the page cache GFP flags of newly created symlinks in the same way that nilfs_new_inode() and __nilfs_read_inode() do, as a workaround until we adopt nofs allocation scope consistently or improve the locking constraints.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-667

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel*≥4.5  –  <4.19.323
linuxlinux_kernel*≥4.20  –  <5.4.285
linuxlinux_kernel*≥5.5  –  <5.10.229
linuxlinux_kernel*≥5.11  –  <5.15.171
linuxlinux_kernel*≥5.16  –  <6.1.116
linuxlinux_kernel*≥6.2  –  <6.6.60
linuxlinux_kernel*≥6.7  –  <6.11.7
linuxlinux_kernel4.4.116any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any
linuxlinux_kernel6.12any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/1246d86e7bbde265761932c6e2dce28c69cdcb91
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58c7f44c7b9e5ac7e3b1e5da2572ed7767a12f38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/69548bb663fcb63f9ee0301be808a36b9d78dac3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9aa5d43ac4cace8fb9bd964ff6c23f599dc3cd24
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a1686db1e59f8fc016c4c9361e2119dd206f479a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3a033e3ecd3471248d474ef263aadc0059e516a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c72e0df0b56c1166736dc8eb62070ebb12591447
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc38c596e648575ce58bfc31623a6506eda4b94a
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1246d86e7bbde265761932c6e2dce28c69cdcb91
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/58c7f44c7b9e5ac7e3b1e5da2572ed7767a12f38
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/69548bb663fcb63f9ee0301be808a36b9d78dac3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9aa5d43ac4cace8fb9bd964ff6c23f599dc3cd24
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a1686db1e59f8fc016c4c9361e2119dd206f479a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b3a033e3ecd3471248d474ef263aadc0059e516a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c72e0df0b56c1166736dc8eb62070ebb12591447
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc38c596e648575ce58bfc31623a6506eda4b94a
    Patch