GHSA-V6R2-3CG3-JRP9
Vulnerability from github – Published: 2026-09-17 18:31 – Updated: 2026-09-17 18:31In the Linux kernel, the following vulnerability has been resolved:
bpf: Reject negative optlen in cgroup getsockopt hook
A cgroup getsockopt BPF program can shrink ctx->optlen after the kernel getsockopt handler has run. The kernel-buffer variant, used by TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original length.
If BPF writes a negative optlen, that value is accepted and propagated back to the TCP getsockopt code. It can then be passed to copy_to_sockptr() as a size_t and trigger the hardened usercopy bytes > INT_MAX warning.
Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(), matching the lower-bound validation already present in the sockptr-based getsockopt hook.
{
"affected": [],
"aliases": [
"CVE-2026-90157"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:08Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject negative optlen in cgroup getsockopt hook\n\nA cgroup getsockopt BPF program can shrink ctx-\u003eoptlen after the\nkernel getsockopt handler has run. The kernel-buffer variant, used by\nTCP_ZEROCOPY_RECEIVE, only rejects values larger than the original\nlength.\n\nIf BPF writes a negative optlen, that value is accepted and propagated\nback to the TCP getsockopt code. It can then be passed to\ncopy_to_sockptr() as a size_t and trigger the hardened usercopy\nbytes \u003e INT_MAX warning.\n\nReject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),\nmatching the lower-bound validation already present in the sockptr-based\ngetsockopt hook.",
"id": "GHSA-v6r2-3cg3-jrp9",
"modified": "2026-09-17T18:31:53Z",
"published": "2026-09-17T18:31:53Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90157"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5"
}
],
"schema_version": "1.4.0",
"severity": []
}
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