CVE-2025-21683— bpf: Fix bpf_sk_select_reuseport() memory leak
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
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
II. Public POCs for CVE-2025-21683
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-21683 (6)
Same Patch Batch · Linux · 2025-01-31 · 20 CVEs total
| CVE-2025-21673 | smb: client: fix double free of TCP_Server_Info::hostname | |
| CVE-2024-57948 | mac802154: check local interfaces before deleting sdata list | |
| CVE-2025-21665 | filemap: avoid truncating 64-bit offset to 32 bits | |
| CVE-2025-21666 | vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] | |
| CVE-2025-21667 | iomap: avoid avoid truncating 64-bit offset to 32 bits | |
| CVE-2025-21668 | pmdomain: imx8mp-blk-ctrl: add missing loop break condition | |
| CVE-2025-21669 | vsock/virtio: discard packets if the transport changes | |
| CVE-2025-21670 | vsock/bpf: return early if transport is not assigned | |
| CVE-2025-21671 | zram: fix potential UAF of zram table | |
| CVE-2025-21672 | afs: Fix merge preference rule failure condition | |
| CVE-2025-21682 | eth: bnxt: always recalculate features after XDP clearing, fix null-deref | |
| CVE-2025-21674 | net/mlx5e: Fix inversion dependency warning while enabling IPsec tunnel | |
| CVE-2025-21675 | net/mlx5: Clear port select structure when fail to create | |
| CVE-2025-21676 | net: fec: handle page_pool_dev_alloc_pages error | |
| CVE-2025-21677 | pfcp: Destroy device along with udp socket's netns dismantle. | |
| CVE-2025-21679 | btrfs: add the missing error handling inside get_canonical_dev_path | |
| CVE-2025-21678 | gtp: Destroy device along with udp socket's netns dismantle. | |
| CVE-2025-21681 | openvswitch: fix lockup on tx to unregistering netdev with carrier | |
| CVE-2025-21680 | pktgen: Avoid out-of-bounds access in get_imix_entries |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects - CVE-2026-43499
rtmutex: Use waiter::task instead of current in remove_waite - CVE-2026-43497
fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-aft
Same vendor: Linux
- CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects - CVE-2026-43499
rtmutex: Use waiter::task instead of current in remove_waite - CVE-2026-43497
fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-aft
V. Comments for CVE-2025-21683
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