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bpf: Reject negative optlen in cgroup getsockopt hook

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90157

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-2026-90157

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": "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"
      }
    ],
    "programFiles": [
      "kernel/bpf/cgroup.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/cgroup.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90157

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36549 · Revision 1
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Publisher date
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