Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2025-21671— zram: fix potential UAF of zram table

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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存在资源管理错误漏洞，该漏洞源于zram_meta_alloc函数在分配失败时未将zram->table设置为NULL，可能导致在设备未正确初始化时访问已释放的内存。

AI Predicted 4.4 Difficulty: Hard EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 7

VendorProduct Version RangeStatus
Linux Linux ac3b5366b9b7c9d97b606532ceab43d2329a22f3< fe3de867f94819ba0f28e035c0b0182150147d95 affected
0b5b0b65561b34e6e360de317e4bcd031bfabf42< 571d3f6045cd3a6d9f6aec33b678f3ffe97582ef affected
6fb92e9a52e3feae309a213950f21dfcd1eb0b40< 902ef8f16d5ca77edc77c30656be54186c1e99b7 affected
74363ec674cb172d8856de25776c8f3103f05e2f< 212fe1c0df4a150fb6298db2cfff267ceaba5402 affected
6.1.122< 6.1.127 affected
6.6.68< 6.6.74 affected
6.12.7< 6.12.11 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-21671

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
zram: fix potential UAF of zram table
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL. Which will potentially cause zram_meta_free to access the table if user reset an failed and uninitialized device.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 资源管理错误漏洞
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存在资源管理错误漏洞，该漏洞源于zram_meta_alloc函数在分配失败时未将zram->table设置为NULL，可能导致在设备未正确初始化时访问已释放的内存。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux ac3b5366b9b7c9d97b606532ceab43d2329a22f3 ~ fe3de867f94819ba0f28e035c0b0182150147d95 -
Linux Linux 6.1.122 ~ 6.1.127 -

II. Public POCs for CVE-2025-21671

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-21671

请登录查看更多情报信息。

Patches & Fixes for CVE-2025-21671 (4)

Same Patch Batch · Linux · 2025-01-31 · 20 CVEs total

CVE-2025-21673 9.8 CRITICAL smb: client: fix double free of TCP_Server_Info::hostname
CVE-2025-21680 7.8 HIGH pktgen: Avoid out-of-bounds access in get_imix_entries
CVE-2025-21678 7.8 HIGH gtp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21677 7.8 HIGH pfcp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21669 7.8 HIGH vsock/virtio: discard packets if the transport changes
CVE-2025-21676 7.5 HIGH net: fec: handle page_pool_dev_alloc_pages error
CVE-2025-21682 7.3 HIGH eth: bnxt: always recalculate features after XDP clearing, fix null-deref
CVE-2024-57948 mac802154: check local interfaces before deleting sdata list
CVE-2025-21683 bpf: Fix bpf_sk_select_reuseport() memory leak
CVE-2025-21665 filemap: avoid truncating 64-bit offset to 32 bits
CVE-2025-21666 vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
CVE-2025-21667 iomap: avoid avoid truncating 64-bit offset to 32 bits
CVE-2025-21668 pmdomain: imx8mp-blk-ctrl: add missing loop break condition
CVE-2025-21670 vsock/bpf: return early if transport is not assigned
CVE-2025-21672 afs: Fix merge preference rule failure condition
CVE-2025-21674 net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel
CVE-2025-21675 net/mlx5: Clear port select structure when fail to create
CVE-2025-21679 btrfs: add the missing error handling inside get_canonical_dev_path
CVE-2025-21681 openvswitch: fix lockup on tx to unregistering netdev with carrier

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21671

No comments yet

Leave a comment