bpf: tcp: fix double sock release on batch realloc
In the Linux kernel, the following vulnerability has been resolved: bpf: tcp: fix double sock release on batch realloc bpf_iter_tcp_batch() releases the current batch via bpf_iter_tcp_put_batch(), which drops the socket refs and rewrites each slot with the socket cookie, then grows the batch. cur_sk/end_sk are kept for bpf_iter_tcp_resume(), but on realloc failure the function returns ERR_PTR() before resume runs, leaving cur_sk < end_sk over slots that now hold cookies rather than sock pointers. bpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and dereferences a cookie as a struct sock. Empty the batch on the failure path so stop() does not release it again. The sockets were already freed by the first bpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans the bucket from the start instead of skipping it. The sibling GFP_NOWAIT failure path still holds real socket references and is left for stop() to release. BUG: KASAN: null-ptr-deref in __sock_gen_cookie Read of size 8 at addr 0000000000000059 by task exploit ... __sock_gen_cookie (net/core/sock_diag.c:28) bpf_iter_tcp_put_batch (net/ipv4/tcp_ipv4.c:2918) bpf_iter_tcp_seq_stop (net/ipv4/tcp_ipv4.c:3270) bpf_seq_read (kernel/bpf/bpf_iter.c:205) vfs_read (fs/read_write.c:572) ksys_read (fs/read_write.c:716) do_syscall_64 entry_SYSCALL_64_after_hwframe Kernel panic - not syncing: Fatal exception
CVE-2026-64575
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-2026-64575
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": "9794ac757a650dd594391192183c9caf939f8223",
"lessThan": "c842882e4c5d2818b858d6baf3fd10958c93f729",
"versionType": "git"
},
{
"status": "affected",
"version": "1d7a82c1df5fc397eaca9c6b8c8f61aae9866ad4",
"lessThan": "7a6a6d2a127866935f87b55b557bc89693065462",
"versionType": "git"
},
{
"status": "affected",
"version": "36f955807ee4ede07e9410772f792e4cb4ec807b",
"lessThan": "f0c1810320b0dac228103fad7311e89532134d83",
"versionType": "git"
},
{
"status": "affected",
"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
"lessThan": "9f27c4f0ae35b5390ce4f7a54d3501144e41a54d",
"versionType": "git"
},
{
"status": "affected",
"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
"lessThan": "8a726e9585ffe7bfbfad2b5279277a00973970f3",
"versionType": "git"
},
{
"status": "affected",
"version": "cdec67a489d4fdae3e83e04fca0419136a83c4c2",
"lessThan": "980a813452754f8001704744e92f7aa697c53dd3",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/tcp_ipv4.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/tcp_ipv4.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64575
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41094 · Revision 1
- Added to Heist Feed
- Publisher date