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CVE-2025-40119— ext4: fix potential null deref in ext4_mb_init()

EPSS 0.03% · P8
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I. Basic Information for CVE-2025-40119

Vulnerability Information
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Vulnerability Title
ext4: fix potential null deref in ext4_mb_init()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix potential null deref in ext4_mb_init() In ext4_mb_init(), ext4_mb_avg_fragment_size_destroy() may be called when sbi->s_mb_avg_fragment_size remains uninitialized (e.g., if groupinfo slab cache allocation fails). Since ext4_mb_avg_fragment_size_destroy() lacks null pointer checking, this leads to a null pointer dereference. ================================================================== EXT4-fs: no memory for groupinfo slab cache BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: Oops: 0002 [#1] SMP PTI CPU:2 UID: 0 PID: 87 Comm:mount Not tainted 6.17.0-rc2 #1134 PREEMPT(none) RIP: 0010:_raw_spin_lock_irqsave+0x1b/0x40 Call Trace: <TASK> xa_destroy+0x61/0x130 ext4_mb_init+0x483/0x540 __ext4_fill_super+0x116d/0x17b0 ext4_fill_super+0xd3/0x280 get_tree_bdev_flags+0x132/0x1d0 vfs_get_tree+0x29/0xd0 do_new_mount+0x197/0x300 __x64_sys_mount+0x116/0x150 do_syscall_64+0x50/0x1c0 entry_SYSCALL_64_after_hwframe+0x76/0x7e ================================================================== Therefore, add necessary null check to ext4_mb_avg_fragment_size_destroy() to prevent this issue. The same fix is also applied to ext4_mb_largest_free_orders_destroy().
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，该漏洞源于空指针取消引用，可能导致系统崩溃。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux d99d714f714c9492dc64d8ab4329b083dbfa9cab ~ 08d9175578d6a8e9b81921898fbf01aa669cd2be -
LinuxLinux 6.17 -

II. Public POCs for CVE-2025-40119

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III. Intelligence Information for CVE-2025-40119

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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

CVE-2025-40176tls: wait for pending async decryptions if tls_strp_msg_hold fails
CVE-2025-40172accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40169bpf: Reject negative offsets for ALU ops
CVE-2025-40166drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40167ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40164usbnet: Fix using smp_processor_id() in preemptible code warnings
CVE-2025-40162ASoC: amd/sdw_utils: avoid NULL deref when devm_kasprintf() fails
CVE-2025-40163sched/deadline: Stop dl_server before CPU goes offline
CVE-2025-40165media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40175idpf: cleanup remaining SKBs in PTP flows
CVE-2025-40174x86/mm: Fix SMP ordering in switch_mm_irqs_off()
CVE-2025-40173net/ip6_tunnel: Prevent perpetual tunnel growth
CVE-2025-40177accel/qaic: Fix bootlog initialization ordering
CVE-2025-40178pid: Add a judgment for ns null in pid_nr_ns
CVE-2025-40179ext4: verify orphan file size is not too big
CVE-2025-40180mailbox: zynqmp-ipi: Fix out-of-bounds access in mailbox cleanup loop
CVE-2025-40181x86/kvm: Force legacy PCI hole to UC when overriding MTRRs for TDX/SNP
CVE-2025-40183bpf: Fix metadata_dst leak __bpf_redirect_neigh_v{4,6}
CVE-2025-40182crypto: skcipher - Fix reqsize handling
CVE-2025-40184KVM: arm64: Fix debug checking for np-guests using huge mappings

Showing top 20 of 96 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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