CVE-2026-43178— procfs: fix possible double mmput() in do_procmap_query()
Possible ATT&CK Techniques 1AI
T1211 · Exploitation for StealthAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | b9b97e6aeb534315f9646b2090d1a5024c6a4e82< f9fe092084cd04deea18747f58a2304026e76aaa | affected |
cbc03ce3e6ce7e21214c3f02218213574c1a2d08< 8adaff87db143583e08eec4f4e7788f1ef8af94d | affected | ||
b5cbacd7f86f4f62b8813688c8e73be94e8e1951< 90f5e87c9b75833b9ef3a4415b92c0247f28ab2f | affected | ||
b5cbacd7f86f4f62b8813688c8e73be94e8e1951< 61dc9f776705d6db6847c101b98fa4f0e9eb6fa3 | affected | ||
6.12.70< 6.12.75 | affected | ||
6.18.10< 6.18.16 | affected | ||
6.19 | affected | ||
< 6.19 | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-43178
Vulnerability Information
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Vulnerability Title
procfs: fix possible double mmput() in do_procmap_query()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: procfs: fix possible double mmput() in do_procmap_query() When user provides incorrectly sized buffer for build ID for PROCMAP_QUERY we return with -ENAMETOOLONG error. After recent changes this condition happens later, after we unlocked mmap_lock/per-VMA lock and did mmput(), so original goto out is now wrong and will double-mmput() mm_struct. Fix by jumping further to clean up only vm_file and name_buf.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于在do_procmap_query中可能因错误路径导致双重mmput。
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-2026-43178
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-43178 (4)
Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total
| CVE-2026-43198 | 9.8 CRITICAL | tcp: fix potential race in tcp_v6_syn_recv_sock() |
| CVE-2026-43125 | 9.8 CRITICAL | dlm: validate length in dlm_search_rsb_tree |
| CVE-2026-43186 | 9.8 CRITICAL | ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data() |
| CVE-2026-43208 | 9.8 CRITICAL | net: do not pass flow_id to set_rps_cpu() |
| CVE-2026-43185 | 9.8 CRITICAL | ksmbd: fix signededness bug in smb_direct_prepare_negotiation() |
| CVE-2026-43114 | 9.4 CRITICAL | netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry |
| CVE-2026-43117 | 9.1 CRITICAL | btrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file() |
| CVE-2026-43083 | 9.1 CRITICAL | net: ioam6: fix OOB and missing lock |
| CVE-2026-43197 | 9.1 CRITICAL | netconsole: avoid OOB reads, msg is not nul-terminated |
| CVE-2026-43112 | 8.8 HIGH | fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath |
| CVE-2026-43176 | 8.8 HIGH | wifi: rtw89: pci: validate release report content before using for RTL8922DE |
| CVE-2026-43283 | 8.8 HIGH | net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle |
| CVE-2026-43215 | 8.8 HIGH | cifs: Fix locking usage for tcon fields |
| CVE-2026-43187 | 8.8 HIGH | xfs: delete attr leaf freemap entries when empty |
| CVE-2026-43172 | 8.8 HIGH | wifi: iwlwifi: fix 22000 series SMEM parsing |
| CVE-2026-43232 | 8.8 HIGH | net: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets |
| CVE-2026-43113 | 8.8 HIGH | wifi: wl1251: validate packet IDs before indexing tx_frames |
| CVE-2026-43239 | 8.8 HIGH | smb: client: prevent races in ->query_interfaces() |
| CVE-2026-43110 | 8.8 HIGH | wifi: brcmfmac: validate bsscfg indices in IF events |
| CVE-2026-43249 | 8.8 HIGH | 9p/xen: protect xen_9pfs_front_free against concurrent calls |
Showing top 20 of 224 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-53358
Bluetooth: L2CAP: use chan timer to close channels in cleanu - CVE-2026-53357
Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_c - CVE-2026-53356
drm/i915/gem: Fix phys BO pread/pwrite with offset - CVE-2026-53355
net: rds: clear i_sends on setup unwind - CVE-2026-53354
arm64: errata: Mitigate TLBI errata on various Arm CPUs
Same vendor: Linux
- CVE-2026-53358
Bluetooth: L2CAP: use chan timer to close channels in cleanu - CVE-2026-53357
Bluetooth: fix UAF in l2cap_sock_cleanup_listen() vs l2cap_c - CVE-2026-53356
drm/i915/gem: Fix phys BO pread/pwrite with offset - CVE-2026-53355
net: rds: clear i_sends on setup unwind - CVE-2026-53354
arm64: errata: Mitigate TLBI errata on various Arm CPUs
V. Comments for CVE-2026-43178
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