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CVE-2025-21683— bpf: Fix bpf_sk_select_reuseport() memory leak

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存在安全漏洞，该漏洞源于bpf_sk_select_reuseport函数在查找sockmap时未正确处理TCP已建立连接的套接字引用计数，导致内存泄漏。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 64d85290d79c0677edb5a8ee2295b36c022fa5df< bb36838dac7bb334a3f3d7eb29875593ec9473fc affected
64d85290d79c0677edb5a8ee2295b36c022fa5df< 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf affected
64d85290d79c0677edb5a8ee2295b36c022fa5df< d0a3b3d1176d39218b8edb2a2d03164942ab9ccd affected
64d85290d79c0677edb5a8ee2295b36c022fa5df< b02e70be498b138e9c21701c2f33f4018ca7cd5e affected
64d85290d79c0677edb5a8ee2295b36c022fa5df< cccd51dd22574216e64e5d205489e634f86999f3 affected
64d85290d79c0677edb5a8ee2295b36c022fa5df< b3af60928ab9129befa65e6df0310d27300942bf affected
5.8 affected
< 5.8 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-21683

Vulnerability Information
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Vulnerability Title
bpf: Fix bpf_sk_select_reuseport() memory leak
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sk_select_reuseport() memory leak As pointed out in the original comment, lookup in sockmap can return a TCP ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb does not imply a non-refcounted socket. Drop sk's reference in both error paths. unreferenced object 0xffff888101911800 (size 2048): comm "test_progs", pid 44109, jiffies 4297131437 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e
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bpf_sk_select_reuseport函数在查找sockmap时未正确处理TCP已建立连接的套接字引用计数，导致内存泄漏。
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 64d85290d79c0677edb5a8ee2295b36c022fa5df ~ bb36838dac7bb334a3f3d7eb29875593ec9473fc -
Linux Linux 5.8 -

II. Public POCs for CVE-2025-21683

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III. Intelligence Information for CVE-2025-21683

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Patches & Fixes for CVE-2025-21683 (6)

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-2025-21669 7.8 HIGH vsock/virtio: discard packets if the transport changes
CVE-2025-21677 7.8 HIGH pfcp: Destroy device along with udp socket's netns dismantle.
CVE-2025-21678 7.8 HIGH gtp: Destroy device along with udp socket's netns dismantle.
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-2025-21679 btrfs: add the missing error handling inside get_canonical_dev_path
CVE-2025-21675 net/mlx5: Clear port select structure when fail to create
CVE-2025-21674 net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel
CVE-2025-21681 openvswitch: fix lockup on tx to unregistering netdev with carrier
CVE-2025-21672 afs: Fix merge preference rule failure condition
CVE-2025-21671 zram: fix potential UAF of zram table
CVE-2025-21670 vsock/bpf: return early if transport is not assigned
CVE-2025-21668 pmdomain: imx8mp-blk-ctrl: add missing loop break condition
CVE-2025-21667 iomap: avoid avoid truncating 64-bit offset to 32 bits
CVE-2025-21666 vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
CVE-2025-21665 filemap: avoid truncating 64-bit offset to 32 bits
CVE-2024-57948 mac802154: check local interfaces before deleting sdata list

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21683

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