CVE-2025-21683

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2025-21683
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21683.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21683
Downstream
Related
Published
2025-01-31T11:25:42.903Z
Modified
2026-03-20T12:40:41.747837Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
bpf: Fix bpf_sk_select_reuseport() memory leak
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix bpfskselect_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 SOATTACHREUSEPORTEBPF set before it was ESTABLISHED. In other words, a non-NULL skreuseport_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 __reuseportalloc+0x1d/0x40 reuseportalloc+0xca/0x150 reuseportattachprog+0x87/0x140 skreuseportattachbpf+0xc8/0x100 sksetsockopt+0x1181/0x1990 dosocksetsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64syssetsockopt+0x1b/0x30 dosyscall64+0x93/0x180 entrySYSCALL64afterhwframe+0x76/0x7e

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21683.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
64d85290d79c0677edb5a8ee2295b36c022fa5df
Fixed
bb36838dac7bb334a3f3d7eb29875593ec9473fc
Fixed
0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf
Fixed
d0a3b3d1176d39218b8edb2a2d03164942ab9ccd
Fixed
b02e70be498b138e9c21701c2f33f4018ca7cd5e
Fixed
cccd51dd22574216e64e5d205489e634f86999f3
Fixed
b3af60928ab9129befa65e6df0310d27300942bf

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21683.json"