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CVE-2026-72316— dm era: fix NULL pointer dereference in metadata_open()

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基金会开源的一个操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于metadata_open()函数在kzalloc_obj()失败时返回NULL，但调用者era_ctr()仅检查IS_ERR(md)，导致空指针被当作有效结果并赋值给era->md，访问元数据时触发空指针取消引用。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux eec40579d84873dfb7021eb24c50360f073237c5< a705e056c2f3dd067fb2ff414f0537530baa090b affected
eec40579d84873dfb7021eb24c50360f073237c5< bd5a80128bdfc93b1cae935a70da000b8c483e6e affected
eec40579d84873dfb7021eb24c50360f073237c5< 17eb2ab13edd0b06ce6f996c5fd450d7efabb2e8 affected
eec40579d84873dfb7021eb24c50360f073237c5< 889374b8e4a60d13fe4a5a8ae3a311ca93d1a2c3 affected
eec40579d84873dfb7021eb24c50360f073237c5< 01c49eae7c6256f2d8cc08210a2bac3ee070e43a affected
eec40579d84873dfb7021eb24c50360f073237c5< 14e03ecd3b1b5fc03c082b27a2f8889f8290c30e affected
eec40579d84873dfb7021eb24c50360f073237c5< b69ea153d30ce19ca8997eeeca1e2219fae5a29b affected
eec40579d84873dfb7021eb24c50360f073237c5< 9ae672606c17891d90b282e3490b817620549599 affected
… +10 more rows
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I. Basic Information for CVE-2026-72316

Vulnerability Information
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Vulnerability Title
dm era: fix NULL pointer dereference in metadata_open()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm era: fix NULL pointer dereference in metadata_open() metadata_open() returns NULL when kzalloc_obj() fails, but the caller era_ctr() only checks IS_ERR(md). Since IS_ERR(NULL) returns false, the NULL pointer is treated as a valid result and later assigned to era->md, leading to a NULL pointer dereference when the metadata is accessed. Fix this by returning ERR_PTR(-ENOMEM) on allocation failure, consistent with dm-cache-metadata.c, dm-thin-metadata.c, and dm-clone-metadata.c which all use ERR_PTR(-ENOMEM) for the same pattern.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于metadata_open()函数在kzalloc_obj()失败时返回NULL，但调用者era_ctr()仅检查IS_ERR(md)，导致空指针被当作有效结果并赋值给era->md，访问元数据时触发空指针取消引用。
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 eec40579d84873dfb7021eb24c50360f073237c5 ~ a705e056c2f3dd067fb2ff414f0537530baa090b -
Linux Linux 3.15 -

II. Public POCs for CVE-2026-72316

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III. Intelligence Information for CVE-2026-72316

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Patches & Fixes for CVE-2026-72316 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72463 9.8 CRITICAL xfrm: Fix dev use-after-free in xfrm async resumption
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
CVE-2026-72351 9.8 CRITICAL gue: validate REMCSUM private option length

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72316

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