CVE-2026-90157

Full vulnerability record from the local CVENow database.

Description

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

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:08.817000

Last modified

2026-10-19 09:19:05.677000

View original CVE JSON

{
  "id": "CVE-2026-90157",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:08.817",
  "lastModified": "2026-10-19T09:19:05.677",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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->optlen 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 > 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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "kernel/bpf/cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "08f61a34913558e06576e7b6318bf583f273c1be",
              "lessThan": "5b09d984b38b018b123c3a9e02a96bbc6468dbe5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "554ba7195c4108726450e24480c8449990c2268c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "d02a12b4085ffe41ea750b1007f7a9c7aee2875a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "f68671b1a98d426c57864bd457c125fee14ac1a5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "2bdbe00454200fcb0110f31eeca8d906a3515e74",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "31a89af4f513d750fec196e2bb6195a7d4473e9f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "9cacf81f8161111db25f98e78a7a0e32ae142b3f",
              "lessThan": "1b5aacd5b2419b0790e955e466d389a61c79b4b1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.10.188",
              "lessThan": "5.10.270",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "kernel/bpf/cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.12",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.12",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}