{"api_version":"1","generated_at":"2026-08-22T08:37:10+00:00","cve":"CVE-2026-68440","urls":{"html":"https://cve.report/CVE-2026-68440","api":"https://cve.report/api/cve/CVE-2026-68440.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68440","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68440"},"summary":{"title":"net: txgbe: fix heap overflow when reading module EEPROM","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: txgbe: fix heap overflow when reading module EEPROM\n\ntxgbe_read_eeprom_hostif() always copies round_up(length, 4) bytes\ninto the caller buffer, which ethtool allocates with exactly 'length'\nbytes. A non-4-aligned length therefore causes an out-of-bounds write.\nCopy only the remaining bytes on the final dword instead.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-12 00:17:44","updated_at":"2026-08-17 06:17:53"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/6a905a71fd43ce8b45f05044b11491337f232c9d","name":"https://git.kernel.org/stable/c/6a905a71fd43ce8b45f05044b11491337f232c9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/febcced6958158e7e90a55a8567b3f5c3639c0b9","name":"https://git.kernel.org/stable/c/febcced6958158e7e90a55a8567b3f5c3639c0b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68440","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68440","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b97b6b5635b3de18debd07a3adcf25198ec8299 febcced6958158e7e90a55a8567b3f5c3639c0b9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b97b6b5635b3de18debd07a3adcf25198ec8299 6a905a71fd43ce8b45f05044b11491337f232c9d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68440","cve":"CVE-2026-68440","epss":"0.001240000","percentile":"0.025270000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/ethernet/wangxun/txgbe/txgbe_aml.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"febcced6958158e7e90a55a8567b3f5c3639c0b9","status":"affected","version":"9b97b6b5635b3de18debd07a3adcf25198ec8299","versionType":"git"},{"lessThan":"6a905a71fd43ce8b45f05044b11491337f232c9d","status":"affected","version":"9b97b6b5635b3de18debd07a3adcf25198ec8299","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/ethernet/wangxun/txgbe/txgbe_aml.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.19"},{"lessThan":"6.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: txgbe: fix heap overflow when reading module EEPROM\n\ntxgbe_read_eeprom_hostif() always copies round_up(length, 4) bytes\ninto the caller buffer, which ethtool allocates with exactly 'length'\nbytes. A non-4-aligned length therefore causes an out-of-bounds write.\nCopy only the remaining bytes on the final dword instead."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is triggered through the ethtool genetlink interface (ETHTOOL_MSG_MODULE_EEPROM_GET) from a local socket; no network packet or remote peer data reaches the vulnerable copy loop.\nAC:L - The attacker fully controls the request length attribute (policy allows 1..128 with no alignment constraint), so any non-4-aligned value deterministically triggers the over-copy on every call, repeatably and without racing.\nPR:L - The ethtool op is gated by GENL_UNS_ADMIN_PERM, i.e. ns-capable CAP_NET_ADMIN in the user namespace owning the netdev's netns, which an unprivileged user can obtain via unshare -Urn rather than real root.\nUI:N - The attacker issues the ethtool netlink request directly; no victim action, module plug event, or administrator step is needed.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The overflow is a heap memory-corruption primitive adjacent to attacker-groomable slab objects, and corrupting neighbouring object metadata (lengths, pointers) can be leveraged to disclose arbitrary kernel memory back through the same ethtool reply.\nI:H - This is an out-of-bounds heap write with firmware/module-supplied bytes past the end of a caller-sized kmalloc buffer, giving an attacker-triggerable corruption of adjacent kernel data that can be steered toward control-flow hijacking.\nA:H - Corrupting adjacent slab objects or allocator metadata leads to kernel oops/panic, and on KASAN or hardened configurations the slab-out-of-bounds write itself aborts the kernel, so a repeatable denial of service is available."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:05:37.444Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/febcced6958158e7e90a55a8567b3f5c3639c0b9"},{"url":"https://git.kernel.org/stable/c/6a905a71fd43ce8b45f05044b11491337f232c9d"}],"title":"net: txgbe: fix heap overflow when reading module EEPROM","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68440","datePublished":"2026-08-12T00:07:29.605Z","dateReserved":"2026-07-30T09:28:09.394Z","dateUpdated":"2026-08-17T05:05:37.444Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-12 00:17:44","lastModifiedDate":"2026-08-17 06:17:53","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68440","Ordinal":"1","Title":"net: txgbe: fix heap overflow when reading module EEPROM","CVE":"CVE-2026-68440","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68440","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: txgbe: fix heap overflow when reading module EEPROM\n\ntxgbe_read_eeprom_hostif() always copies round_up(length, 4) bytes\ninto the caller buffer, which ethtool allocates with exactly 'length'\nbytes. A non-4-aligned length therefore causes an out-of-bounds write.\nCopy only the remaining bytes on the final dword instead.","Type":"Description","Title":"net: txgbe: fix heap overflow when reading module EEPROM"}]}}}