{"api_version":"1","generated_at":"2026-08-17T11:25:10+00:00","cve":"CVE-2026-74548","urls":{"html":"https://cve.report/CVE-2026-74548","api":"https://cve.report/api/cve/CVE-2026-74548.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74548","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74548"},"summary":{"title":"forcedeth: fix UAF of txrx_stats in nv_remove","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nforcedeth: fix UAF of txrx_stats in nv_remove\n\nnv_remove() frees the per-CPU txrx_stats before unregister_netdev().\nUntil unregister completes, ndo_get_stats64, the NAPI/xmit data path,\nand nv_close()/drain may still access txrx_stats, leading to a\nuse-after-free.\n\nFree the stats only after unregister_netdev().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:18:00","updated_at":"2026-08-17 06:19:52"},"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/201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1","name":"https://git.kernel.org/stable/c/201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae20a8a4de06a289d40b0a0633d8d573f1fcb049","name":"https://git.kernel.org/stable/c/ae20a8a4de06a289d40b0a0633d8d573f1fcb049","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c9d24a205fd508b9999fcab6aca4c590490a12cf","name":"https://git.kernel.org/stable/c/c9d24a205fd508b9999fcab6aca4c590490a12cf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cf2dcde2284562ff87830ca0b7fa2b06e95aef1e","name":"https://git.kernel.org/stable/c/cf2dcde2284562ff87830ca0b7fa2b06e95aef1e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22666ba1420164753d7b0f5a841986b25ace5435","name":"https://git.kernel.org/stable/c/22666ba1420164753d7b0f5a841986b25ace5435","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74548","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74548","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4b633b911fd3b4cbe1dc065e8fb064078d0889d cf2dcde2284562ff87830ca0b7fa2b06e95aef1e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4b633b911fd3b4cbe1dc065e8fb064078d0889d c9d24a205fd508b9999fcab6aca4c590490a12cf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4b633b911fd3b4cbe1dc065e8fb064078d0889d ae20a8a4de06a289d40b0a0633d8d573f1fcb049 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f4b633b911fd3b4cbe1dc065e8fb064078d0889d 201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74548","cve":"CVE-2026-74548","epss":"0.001680000","percentile":"0.064970000","score_date":"2026-08-16","updated_at":"2026-08-17 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the Linux kernel, the following vulnerability has been resolved:\n\nforcedeth: fix UAF of txrx_stats in nv_remove\n\nnv_remove() frees the per-CPU txrx_stats before unregister_netdev().\nUntil unregister completes, ndo_get_stats64, the NAPI/xmit data path,\nand nv_close()/drain may still access txrx_stats, leading to a\nuse-after-free.\n\nFree the stats only after unregister_netdev()."}],"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 UAF is opened in nv_remove() during local PCI/driver teardown (sysfs unbind, module unload, or hot-unplug); although NAPI/xmit and stats readers can run concurrently on still-registered netdev traffic, there is no standalone remote path into nv_remove itself.\nAC:L - Once teardown starts, unregister_netdev() deterministically calls nv_close()→nv_drain_tx(), which increments freed txrx_stats when TX skbs remain, and an attacker can also drive the race by timing unbind against stats polling or packet I/O they control.\nPR:L - Privileged teardown opens the window, but unprivileged peers can supply the concurrent netdev access (rtnetlink/sysfs stats via nv_get_stats64, and RX/TX on the still-up interface) that performs the UAF; per CNA driver-removal UAF precedent and the higher-severity tiebreak, PR:L.\nUI:N - No separate victim action is required beyond routine driver removal or module unload on a live interface; monitoring daemons and network traffic can hit the freed stats automatically during the unregister window without user cooperation.\nS:U - Impact is kernel heap corruption and crash/privilege escalation within the host kernel security authority; it does not cross VM, hypervisor, IOMMU, or container sandbox boundaries.\nC:H - The bug is a kmalloc-backed per-CPU UAF: nv_get_stats64 reads freed nv_txrx_stats counters via per_cpu_ptr(), and once the slab is reallocated an attacker can obtain arbitrary kernel memory disclosure.\nI:H - Freed txrx_stats are updated from NAPI/xmit and nv_drain_tx() via __this_cpu_inc/add on attacker-influenced traffic, enabling heap grooming and controlled writes through the dangling per-CPU pointer for code execution.\nA:H - Use-after-free dereferences of txrx_stats during netdev teardown reliably cause kernel oops/panic (as in the fix description), and even unsuccessful exploitation still crashes the system when concurrent RX/TX or drain paths touch freed memory."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:33.228Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/cf2dcde2284562ff87830ca0b7fa2b06e95aef1e"},{"url":"https://git.kernel.org/stable/c/c9d24a205fd508b9999fcab6aca4c590490a12cf"},{"url":"https://git.kernel.org/stable/c/ae20a8a4de06a289d40b0a0633d8d573f1fcb049"},{"url":"https://git.kernel.org/stable/c/201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1"},{"url":"https://git.kernel.org/stable/c/22666ba1420164753d7b0f5a841986b25ace5435"}],"title":"forcedeth: fix UAF of txrx_stats in nv_remove","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74548","datePublished":"2026-08-15T12:27:56.387Z","dateReserved":"2026-08-15T05:44:03.915Z","dateUpdated":"2026-08-17T05:48:33.228Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:18:00","lastModifiedDate":"2026-08-17 06:19:52","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":"74548","Ordinal":"1","Title":"forcedeth: fix UAF of txrx_stats in nv_remove","CVE":"CVE-2026-74548","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74548","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nforcedeth: fix UAF of txrx_stats in nv_remove\n\nnv_remove() frees the per-CPU txrx_stats before unregister_netdev().\nUntil unregister completes, ndo_get_stats64, the NAPI/xmit data path,\nand nv_close()/drain may still access txrx_stats, leading to a\nuse-after-free.\n\nFree the stats only after unregister_netdev().","Type":"Description","Title":"forcedeth: fix UAF of txrx_stats in nv_remove"}]}}}