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CVE-2026-74487— binfmt_misc: restore write access when removing an entry

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存在安全漏洞，该漏洞源于binfmt_misc在删除条目时未恢复写访问权限，导致inode的i_writecount永久为负，可能造成解释器文件写入持续失败，引发拒绝服务。

AI Predicted 5.5 Difficulty: Easy EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 948b701a607f123df92ed29084413e5dd8cda2ed< 7873f987213695e3564c8c259e6db283e4739472 affected
948b701a607f123df92ed29084413e5dd8cda2ed< 13efc628fdf641d901bdba07caa1c558e1bed046 affected
948b701a607f123df92ed29084413e5dd8cda2ed< f1cf67f6be0babc73afa4ee0e27bdedffeeeb095 affected
948b701a607f123df92ed29084413e5dd8cda2ed< dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c affected
948b701a607f123df92ed29084413e5dd8cda2ed< a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8 affected
948b701a607f123df92ed29084413e5dd8cda2ed< fdc1d702bf3001586221fa07e598e876a0a854c5 affected
948b701a607f123df92ed29084413e5dd8cda2ed< 3b522487a3a9162b1b519eefde7998d103e3e07b affected
948b701a607f123df92ed29084413e5dd8cda2ed< db1856ea9196cf6e015d12199a34c0b9313c7bfa affected
… +10 more rows
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I. Basic Information for CVE-2026-74487

Vulnerability Information
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Vulnerability Title
binfmt_misc: restore write access when removing an entry
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: restore write access when removing an entry Registering an entry with the MISC_FMT_OPEN_FILE flag opens the interpreter via open_exec() which denies write access to it for as long as the entry exists. Removing the entry closes the interpreter file via filp_close() but never restores write access, leaving the inode's i_writecount permanently negative. Opening the interpreter for writing keeps failing with ETXTBSY long after the entry is gone until the inode is evicted from the inode cache. Commit 90f601b497d7 ("binfmt_misc: restore write access before closing files opened by open_exec()") fixed the same imbalance in the error path of bm_register_write() but the actual removal path has been leaking the write denial since the introduction of the flag. Restore write access in put_binfmt_handler() before closing the interpreter file.
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存在安全漏洞，该漏洞源于binfmt_misc在删除条目时未恢复写访问权限，导致inode的i_writecount永久为负，可能造成解释器文件写入持续失败，引发拒绝服务。
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 948b701a607f123df92ed29084413e5dd8cda2ed ~ 7873f987213695e3564c8c259e6db283e4739472 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-74487

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III. Intelligence Information for CVE-2026-74487

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Patches & Fixes for CVE-2026-74487 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 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-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72221 9.8 CRITICAL sunrpc: wait for in-flight TLS handshake callback when cancel loses race
CVE-2026-72466 9.8 CRITICAL xprtrdma: Fix bcall rep leak and unbounded peek
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
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-2026-72339 9.8 CRITICAL qede: fix off-by-one in BD ring consumption on build_skb failure
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-2026-74255 9.8 CRITICAL tipc: fix UAF in tipc_l2_send_msg()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-72234 9.8 CRITICAL batman-adv: access unicast_ttvn skb->data only after skb realloc
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74487

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