Vulnerability-Lookup

oesa-2026-2931

Vulnerability from osv_openeuler

Published

2026-07-09 08:14

Modified

2026-07-09 08:14

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix bpf_xdp_store_bytes proto for read-only arg

While making some maps in Cilium read-only from the BPF side, we noticed that the bpf_xdp_store_bytes proto is incorrect. In particular, the verifier was throwing the following error:

; ret = ctx_store_bytes(ctx, l3_off + offsetof(struct iphdr, saddr), &nat->address, 4, 0); 635: (79) r1 = (u64 )(r10 -144) ; R1=ctx() R10=fp0 fp-144=ctx() 636: (b4) w2 = 26 ; R2=26 637: (b4) w4 = 4 ; R4=4 638: (b4) w5 = 0 ; R5=0 639: (85) call bpf_xdp_store_bytes#190 write into map forbidden, value_size=6 off=0 size=4

nat comes from a BPF_F_RDONLY_PROG map, so R3 is a PTR_TO_MAP_VALUE. The verifier checks the helper's memory access to R3 in check_mem_size_reg, as it reaches ARG_CONST_SIZE argument. The third argument has expected type ARG_PTR_TO_UNINIT_MEM, which includes the MEM_WRITE flag. The verifier thus checks for a BPF_WRITE access on R3. Given R3 points to a read-only map, the check fails.

Conversely, ARG_PTR_TO_UNINIT_MEM can also lead to the helper reading from uninitialized memory.

This patch simply fixes the expected argument type to match that of bpf_skb_store_bytes.(CVE-2026-45886)

Severity

5.5 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-45886	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bpftool-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "bpftool-debuginfo-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-debuginfo-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-debugsource-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-devel-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-extra-modules-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-headers-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-source-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-tools-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-tools-debuginfo-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "kernel-tools-devel-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "perf-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "perf-debuginfo-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "python3-perf-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm",
          "python3-perf-debuginfo-6.6.0-145.3.18.151.oe2403sp3.aarch64.rpm"
        ],
        "src": [
          "kernel-6.6.0-145.3.18.151.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "bpftool-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "bpftool-debuginfo-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-debuginfo-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-debugsource-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-devel-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-extra-modules-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-headers-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-source-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-tools-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-tools-debuginfo-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "kernel-tools-devel-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "perf-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "perf-debuginfo-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "python3-perf-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm",
          "python3-perf-debuginfo-6.6.0-145.3.18.151.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.0-145.3.18.151.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "The Linux Kernel, the operating system core itself.\n\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_xdp_store_bytes proto for read-only arg\n\nWhile making some maps in Cilium read-only from the BPF side, we noticed\nthat the bpf_xdp_store_bytes proto is incorrect. In particular, the\nverifier was throwing the following error:\n\n  ; ret = ctx_store_bytes(ctx, l3_off + offsetof(struct iphdr, saddr),\n                          \u0026amp;nat-\u0026gt;address, 4, 0);\n  635: (79) r1 = *(u64 *)(r10 -144)     ; R1=ctx() R10=fp0 fp-144=ctx()\n  636: (b4) w2 = 26                     ; R2=26\n  637: (b4) w4 = 4                      ; R4=4\n  638: (b4) w5 = 0                      ; R5=0\n  639: (85) call bpf_xdp_store_bytes#190\n  write into map forbidden, value_size=6 off=0 size=4\n\nnat comes from a BPF_F_RDONLY_PROG map, so R3 is a PTR_TO_MAP_VALUE.\nThe verifier checks the helper\u0026apos;s memory access to R3 in\ncheck_mem_size_reg, as it reaches ARG_CONST_SIZE argument. The third\nargument has expected type ARG_PTR_TO_UNINIT_MEM, which includes the\nMEM_WRITE flag. The verifier thus checks for a BPF_WRITE access on R3.\nGiven R3 points to a read-only map, the check fails.\n\nConversely, ARG_PTR_TO_UNINIT_MEM can also lead to the helper reading\nfrom uninitialized memory.\n\nThis patch simply fixes the expected argument type to match that of\nbpf_skb_store_bytes.(CVE-2026-45886)",
  "id": "OESA-2026-2931",
  "modified": "2026-07-09T08:14:41Z",
  "published": "2026-07-09T08:14:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2931"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45886"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2026-45886"
  ]
}

CVE-2026-45886 (GCVE-0-2026-45886)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:16 – Updated: 2026-05-27 12:16

Title

bpf: Fix bpf_xdp_store_bytes proto for read-only arg

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_xdp_store_bytes proto for read-only arg While making some maps in Cilium read-only from the BPF side, we noticed that the bpf_xdp_store_bytes proto is incorrect. In particular, the verifier was throwing the following error: ; ret = ctx_store_bytes(ctx, l3_off + offsetof(struct iphdr, saddr), &nat->address, 4, 0); 635: (79) r1 = *(u64 *)(r10 -144) ; R1=ctx() R10=fp0 fp-144=ctx() 636: (b4) w2 = 26 ; R2=26 637: (b4) w4 = 4 ; R4=4 638: (b4) w5 = 0 ; R5=0 639: (85) call bpf_xdp_store_bytes#190 write into map forbidden, value_size=6 off=0 size=4 nat comes from a BPF_F_RDONLY_PROG map, so R3 is a PTR_TO_MAP_VALUE. The verifier checks the helper's memory access to R3 in check_mem_size_reg, as it reaches ARG_CONST_SIZE argument. The third argument has expected type ARG_PTR_TO_UNINIT_MEM, which includes the MEM_WRITE flag. The verifier thus checks for a BPF_WRITE access on R3. Given R3 points to a read-only map, the check fails. Conversely, ARG_PTR_TO_UNINIT_MEM can also lead to the helper reading from uninitialized memory. This patch simply fixes the expected argument type to match that of bpf_skb_store_bytes.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/ffb5d1c5e3933b947…
https://git.kernel.org/stable/c/ddc34a1b85505c919…
https://git.kernel.org/stable/c/0db169a91381a473b…
https://git.kernel.org/stable/c/d7b87adeb0eb539b9…
https://git.kernel.org/stable/c/57f7f6a0ad04a65c8…
https://git.kernel.org/stable/c/6557f1565d779851c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < ffb5d1c5e3933b947fc7303ad68bf0c536d0c85e (git) Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < ddc34a1b85505c919026ddc82fafdada9a160b15 (git) Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < 0db169a91381a473b7974021d1c02f8da72c5775 (git) Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < d7b87adeb0eb539b9b824b101bb14fb01e41240b (git) Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < 57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52 (git) Affected: 3f364222d032eea6b245780e845ad213dab28cdd , < 6557f1565d779851c4db9c488c49c05a47a6e72f (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3f364222d032eea6b245780e845ad213dab28cdd",
              "versionType": "git"
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            }
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionEndExcluding": "6.1.165",
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                  "vulnerable": true
                },
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bpf_xdp_store_bytes proto for read-only arg\n\nWhile making some maps in Cilium read-only from the BPF side, we noticed\nthat the bpf_xdp_store_bytes proto is incorrect. In particular, the\nverifier was throwing the following error:\n\n  ; ret = ctx_store_bytes(ctx, l3_off + offsetof(struct iphdr, saddr),\n                          \u0026nat-\u003eaddress, 4, 0);\n  635: (79) r1 = *(u64 *)(r10 -144)     ; R1=ctx() R10=fp0 fp-144=ctx()\n  636: (b4) w2 = 26                     ; R2=26\n  637: (b4) w4 = 4                      ; R4=4\n  638: (b4) w5 = 0                      ; R5=0\n  639: (85) call bpf_xdp_store_bytes#190\n  write into map forbidden, value_size=6 off=0 size=4\n\nnat comes from a BPF_F_RDONLY_PROG map, so R3 is a PTR_TO_MAP_VALUE.\nThe verifier checks the helper\u0027s memory access to R3 in\ncheck_mem_size_reg, as it reaches ARG_CONST_SIZE argument. The third\nargument has expected type ARG_PTR_TO_UNINIT_MEM, which includes the\nMEM_WRITE flag. The verifier thus checks for a BPF_WRITE access on R3.\nGiven R3 points to a read-only map, the check fails.\n\nConversely, ARG_PTR_TO_UNINIT_MEM can also lead to the helper reading\nfrom uninitialized memory.\n\nThis patch simply fixes the expected argument type to match that of\nbpf_skb_store_bytes."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:16:58.000Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
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        {
          "url": "https://git.kernel.org/stable/c/ddc34a1b85505c919026ddc82fafdada9a160b15"
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          "url": "https://git.kernel.org/stable/c/57f7f6a0ad04a65c8a7a067b2f56cbbf2aec9e52"
        },
        {
          "url": "https://git.kernel.org/stable/c/6557f1565d779851c4db9c488c49c05a47a6e72f"
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      ],
      "title": "bpf: Fix bpf_xdp_store_bytes proto for read-only arg",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45886",
    "datePublished": "2026-05-27T12:16:58.000Z",
    "dateReserved": "2026-05-13T15:03:33.082Z",
    "dateUpdated": "2026-05-27T12:16:58.000Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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