CVE-2026-90157 (GCVE-0-2026-90157)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-19 08:58
VLAI
Title
bpf: Reject negative optlen in cgroup getsockopt hook
Summary
In 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 08f61a34913558e06576e7b6318bf583f273c1be , < 5b09d984b38b018b123c3a9e02a96bbc6468dbe5 (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < 554ba7195c4108726450e24480c8449990c2268c (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < d02a12b4085ffe41ea750b1007f7a9c7aee2875a (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2 (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < f68671b1a98d426c57864bd457c125fee14ac1a5 (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < 2bdbe00454200fcb0110f31eeca8d906a3515e74 (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < 31a89af4f513d750fec196e2bb6195a7d4473e9f (git)
Affected: 9cacf81f8161111db25f98e78a7a0e32ae142b3f , < 1b5aacd5b2419b0790e955e466d389a61c79b4b1 (git)
Affected: 5.10.188 , < 5.10.270 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "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."
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    "cveId": "CVE-2026-90157",
    "datePublished": "2026-09-17T16:06:49.081Z",
    "dateReserved": "2026-09-11T19:38:34.790Z",
    "dateUpdated": "2026-10-19T08:58:55.961Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-17T21:29:45+00:00",
      "cve": "CVE-2026-90157",
      "id": "CVE-2026-90157",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "235",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Reject negative optlen in cgroup getsockopt hook",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90157.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-20T00:45:20Z",
      "cve": "CVE-2026-90157",
      "id": "CVE-2026-90157",
      "initial_release_date": "2026-09-18T00:20:38Z",
      "product_status:known_affected": "205",
      "product_status:known_not_affected": "143",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90157",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90157.json",
      "version": "6"
    }
  }
}



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