CVE-2025-21640— sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy
Possible ATT&CK Techniques 1AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 16
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 3c68198e75111a905ac2412be12bf7b29099729b< 5599b212d2f4466e1832a94e9932684aaa364587 | affected |
3c68198e75111a905ac2412be12bf7b29099729b< 03ca51faba2b017bf6c90e139434c4117d0afcdc | affected | ||
3c68198e75111a905ac2412be12bf7b29099729b< 86ddf8118123cb58a0fb8724cad6979c4069065b | affected | ||
3c68198e75111a905ac2412be12bf7b29099729b< 3cd0659deb9c03535fd61839e91d4d4d3e51ac71 | affected | ||
3c68198e75111a905ac2412be12bf7b29099729b< ad673e514b2793b8d5902f6ba6ab7e890dea23d5 | affected | ||
3c68198e75111a905ac2412be12bf7b29099729b< f0bb3935470684306e4e04793a20ac4c4b08de0b | affected | ||
3c68198e75111a905ac2412be12bf7b29099729b< ea62dd1383913b5999f3d16ae99d411f41b528d4 | affected | ||
3.8 | affected | ||
| … +8 more rows | |||
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I. Basic Information for CVE-2025-21640
Vulnerability Information
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Vulnerability Title
sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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。
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-2025-21640
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-21640 (7)
Same Patch Batch · Linux · 2025-01-19 · 47 CVEs total
| CVE-2025-21631 | 7.8 HIGH | block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() |
| CVE-2025-21652 | 7.8 HIGH | ipvlan: Fix use-after-free in ipvlan_get_iflink(). |
| CVE-2025-21646 | 7.5 HIGH | afs: Fix the maximum cell name length |
| CVE-2025-21647 | 7.3 HIGH | sched: sch_cake: add bounds checks to host bulk flow fairness counts |
| CVE-2025-21637 | 7.1 HIGH | sctp: sysctl: udp_port: avoid using current->nsproxy |
| CVE-2025-21638 | 7.1 HIGH | sctp: sysctl: auth_enable: avoid using current->nsproxy |
| CVE-2025-21650 | 7.1 HIGH | net: hns3: fixed hclge_fetch_pf_reg accesses bar space out of bounds issue |
| CVE-2024-57914 | usb: typec: tcpci: fix NULL pointer issue on shared irq case | |
| CVE-2024-57923 | btrfs: zlib: fix avail_in bytes for s390 zlib HW compression path | |
| CVE-2024-57926 | drm/mediatek: Set private->all_drm_private[i]->drm to NULL if mtk_drm_bind returns err | |
| CVE-2024-57925 | ksmbd: fix a missing return value check bug | |
| CVE-2024-57928 | netfs: Fix enomem handling in buffered reads | |
| CVE-2024-57917 | topology: Keep the cpumask unchanged when printing cpumap | |
| CVE-2024-57916 | misc: microchip: pci1xxxx: Resolve kernel panic during GPIO IRQ handling | |
| CVE-2024-57908 | iio: imu: kmx61: fix information leak in triggered buffer | |
| CVE-2024-57913 | usb: gadget: f_fs: Remove WARN_ON in functionfs_bind | |
| CVE-2024-57912 | iio: pressure: zpa2326: fix information leak in triggered buffer | |
| CVE-2024-57911 | iio: dummy: iio_simply_dummy_buffer: fix information leak in triggered buffer | |
| CVE-2024-57910 | iio: light: vcnl4035: fix information leak in triggered buffer | |
| CVE-2024-57906 | iio: adc: ti-ads8688: fix information leak in triggered buffer |
Showing top 20 of 47 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
Same vendor: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec
V. Comments for CVE-2025-21640
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