CVE-2025-21683bpf: Fix bpf_sk_select_reuseport() memory leak
Updated under an hour ago ()
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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
- CVSS
- 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-401
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Not yet received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 64d85290d79c0677edb5a8ee2295b36c022fa5df before bb36838dac7bb334a3f3d7eb29875593ec9473fc; 64d85290d79c0677edb5a8ee2295b36c022fa5df builds before 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf; from 64d85290d79c0677edb5a8ee2295b36c022fa5df before d0a3b3d1176d39218b8edb2a2d03164942ab9ccd; from 64d85290d79c0677edb5a8ee2295b36c022fa5df before b02e70be498b138e9c21701c2f33f4018ca7cd5e; from 64d85290d79c0677edb5a8ee2295b36c022fa5df before cccd51dd22574216e64e5d205489e634f86999f3; from 64d85290d79c0677edb5a8ee2295b36c022fa5df before b3af60928ab9129befa65e6df0310d27300942bf | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
References
- https://git.kernel.org/stable/c/bb36838dac7bb334a3f3d7eb29875593ec9473fc
- https://git.kernel.org/stable/c/0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf
- https://git.kernel.org/stable/c/d0a3b3d1176d39218b8edb2a2d03164942ab9ccd
- https://git.kernel.org/stable/c/b02e70be498b138e9c21701c2f33f4018ca7cd5e
- https://git.kernel.org/stable/c/cccd51dd22574216e64e5d205489e634f86999f3
- https://git.kernel.org/stable/c/b3af60928ab9129befa65e6df0310d27300942bf
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.