AZL-56333
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-56333.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-56333
- Upstream
- Published
- 2025-01-31T12:15:29Z
- Modified
- 2026-04-01T05:18:52.500495Z
- 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
- CVE-2025-21683 affecting package kernel for versions less than 6.6.76.1-1
- 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
- References