CVE-2025-21683bpf: Fix bpf_sk_select_reuseport() memory leak
- 5.5MediumCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 87% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < bb36838dac7bb334a3f3d7eb29875593ec9473fc
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < 0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < d0a3b3d1176d39218b8edb2a2d03164942ab9ccd
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < b02e70be498b138e9c21701c2f33f4018ca7cd5e
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < cccd51dd22574216e64e5d205489e634f86999f3
- affected 64d85290d79c0677edb5a8ee2295b36c022fa5df – < b3af60928ab9129befa65e6df0310d27300942bf
- affected 5.8
- unaffected < 5.8
- unaffected 5.10.234 – ≤ 5.10.*
- unaffected 5.15.177 – ≤ 5.15.*
- unaffected 6.1.127 – ≤ 6.1.*
- unaffected 6.6.74 – ≤ 6.6.*
- unaffected 6.12.11 – ≤ 6.12.*
- unaffected 6.13 – ≤ *
References
References9
- https://git.kernel.org/stable/c/bb36838dac7bb334a3f3d7eb29875593ec9473fc (opens in a new tab)
- https://git.kernel.org/stable/c/0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf (opens in a new tab)
- https://git.kernel.org/stable/c/d0a3b3d1176d39218b8edb2a2d03164942ab9ccd (opens in a new tab)
- https://git.kernel.org/stable/c/b02e70be498b138e9c21701c2f33f4018ca7cd5e (opens in a new tab)
- https://git.kernel.org/stable/c/cccd51dd22574216e64e5d205489e634f86999f3 (opens in a new tab)
- https://git.kernel.org/stable/c/b3af60928ab9129befa65e6df0310d27300942bf (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-2632 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21683)Record last updated .