CVE-2025-40049— Squashfs: fix uninit-value in squashfs_get_parent
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I. Basic Information for CVE-2025-40049
Vulnerability Information
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Vulnerability Title
Squashfs: fix uninit-value in squashfs_get_parent
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Squashfs: fix uninit-value in squashfs_get_parent Syzkaller reports a "KMSAN: uninit-value in squashfs_get_parent" bug. This is caused by open_by_handle_at() being called with a file handle containing an invalid parent inode number. In particular the inode number is that of a symbolic link, rather than a directory. Squashfs_get_parent() gets called with that symbolic link inode, and accesses the parent member field. unsigned int parent_ino = squashfs_i(inode)->parent; Because non-directory inodes in Squashfs do not have a parent value, this is uninitialised, and this causes an uninitialised value access. The fix is to initialise parent with the invalid inode 0, which will cause an EINVAL error to be returned. Regular inodes used to share the parent field with the block_list_start field. This is removed in this commit to enable the parent field to contain the invalid inode number 0.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于squashfs_get_parent函数中未初始化的parent字段访问，可能导致无效inode访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40049
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Same Patch Batch · Linux · 2025-10-28 · 58 CVEs total
| CVE-2025-40064 | smc: Fix use-after-free in __pnet_find_base_ndev(). | |
| CVE-2025-40075 | tcp_metrics: use dst_dev_net_rcu() | |
| CVE-2025-40078 | bpf: Explicitly check accesses to bpf_sock_addr | |
| CVE-2025-40079 | riscv, bpf: Sign extend struct ops return values properly | |
| CVE-2025-40077 | f2fs: fix to avoid overflow while left shift operation | |
| CVE-2025-40081 | perf: arm_spe: Prevent overflow in PERF_IDX2OFF() | |
| CVE-2025-40068 | fs: ntfs3: Fix integer overflow in run_unpack() | |
| CVE-2025-40067 | fs/ntfs3: reject index allocation if $BITMAP is empty but blocks exist | |
| CVE-2025-40066 | wifi: mt76: mt7996: Check phy before init msta_link in mt7996_mac_sta_add_links() | |
| CVE-2025-40065 | RISC-V: KVM: Write hgatp register with valid mode bits | |
| CVE-2025-40069 | drm/msm: Fix obj leak in VM_BIND error path | |
| CVE-2025-40063 | crypto: comp - Use same definition of context alloc and free ops | |
| CVE-2025-40062 | crypto: hisilicon/qm - set NULL to qm->debug.qm_diff_regs | |
| CVE-2025-40061 | RDMA/rxe: Fix race in do_task() when draining | |
| CVE-2025-40060 | coresight: trbe: Return NULL pointer for allocation failures | |
| CVE-2025-40058 | iommu/vt-d: Disallow dirty tracking if incoherent page walk | |
| CVE-2025-40059 | coresight: Fix incorrect handling for return value of devm_kzalloc | |
| CVE-2025-40057 | ptp: Add a upper bound on max_vclocks | |
| CVE-2025-40056 | vhost: vringh: Fix copy_to_iter return value check | |
| CVE-2025-40055 | ocfs2: fix double free in user_cluster_connect() |
Showing top 20 of 58 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-40049
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