{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-45940 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-45940 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-45940 and fix it if it is affected.\n\nWhat it is: CVE-2026-45940 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-45940 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-45940/ (Markdown: https://insights.sbomify.com/CVE-2026-45940/index.md)","id":"CVE-2026-45940","markdown":"https://insights.sbomify.com/CVE-2026-45940/index.md","name":"CVE-2026-45940","record":{"aliases":["AZL-88761","BELL-CVE-2026-45940","DEBIAN-CVE-2026-45940","GHSA-fr2g-jcmh-j266","ROOT-OS-DEBIAN-11-CVE-2026-45940","ROOT-OS-DEBIAN-12-CVE-2026-45940","ROOT-OS-DEBIAN-13-CVE-2026-45940","ROOT-OS-UBUNTU-2204-CVE-2026-45940","ROOT-OS-UBUNTU-2404-CVE-2026-45940","UBUNTU-CVE-2026-45940"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel driver","requires_auth":"low_privilege","summary":"A null pointer dereference in the stmmac network driver causes a kernel oops when split header mode is enabled, leading to denial of service.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: fix oops when split header is enabled\n\nFor GMAC4, when split header is enabled, in some rare cases, the\nhardware does not fill buf2 of the first descriptor with payload.\nThus we cannot assume buf2 is always fully filled if it is not\nthe last descriptor. Otherwise, the length of buf2 of the second\ndescriptor will be calculated wrong and cause an oops:\n\nUnable to handle kernel paging request at virtual address ffff00019246bfc0\n...\nx2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000\nCall trace:\n dcache_inval_poc+0x28/0x58 (P)\n dma_direct_sync_single_for_cpu+0x38/0x6c\n __dma_sync_single_for_cpu+0x34/0x6c\n stmmac_napi_poll_rx+0x8f0/0xb60\n __napi_poll.constprop.0+0x30/0x144\n net_rx_action+0x160/0x274\n handle_softirqs+0x1b8/0x1fc\n...\n\nTo fix this, the PL bit-field in RDES3 register is used for all\ndescriptors, whether it is the last descriptor or not.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"net: stmmac: fix oops when split header is enabled","id":"CVE-2026-45940","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"tpm: tpm_i2c_infineon: Fix locality leak on get_burstcount() failure","id":"CVE-2026-45941"},"packages":[],"prev":{"headline":"gpib: Fix memory leak in ni_usb_init()","id":"CVE-2026-45939"},"products":["Linux"],"published":"2026-05-27","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A null pointer dereference in the stmmac network driver causes a kernel oops when split header mode is enabled, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2026-45940/"}