bpf: Fix bpf_sk_select_reuseport() memory leak
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
CVE-2025-21683
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21683
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "bb36838dac7bb334a3f3d7eb29875593ec9473fc",
"versionType": "git"
},
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf",
"versionType": "git"
},
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "d0a3b3d1176d39218b8edb2a2d03164942ab9ccd",
"versionType": "git"
},
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "b02e70be498b138e9c21701c2f33f4018ca7cd5e",
"versionType": "git"
},
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "cccd51dd22574216e64e5d205489e634f86999f3",
"versionType": "git"
},
{
"status": "affected",
"version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
"lessThan": "b3af60928ab9129befa65e6df0310d27300942bf",
"versionType": "git"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.234",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.177",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.127",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.74",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.11",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/core/filter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21683
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26906 · Revision 1
- Added to Heist Feed
- Publisher date