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CVE-2026-74548 (GCVE-0-2026-74548)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
forcedeth: fix UAF of txrx_stats in nv_remove
Summary
In the Linux kernel, the following vulnerability has been resolved: forcedeth: fix UAF of txrx_stats in nv_remove nv_remove() frees the per-CPU txrx_stats before unregister_netdev(). Until unregister completes, ndo_get_stats64, the NAPI/xmit data path, and nv_close()/drain may still access txrx_stats, leading to a use-after-free. Free the stats only after unregister_netdev().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < cdf864d5d3c813ae1876f2bacc1cf3ac3c66dfc9 (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < 7c22b4ee0bd003cecfc14ca28981cb213e201f70 (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < d51ce7a63b76eda02cabfed1b0cc277b2f5c9bcc (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < cf2dcde2284562ff87830ca0b7fa2b06e95aef1e (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < c9d24a205fd508b9999fcab6aca4c590490a12cf (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < ae20a8a4de06a289d40b0a0633d8d573f1fcb049 (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < 201e05aa531eba0dfe2ee05b4e178f6ffa12c8b1 (git)
Affected: f4b633b911fd3b4cbe1dc065e8fb064078d0889d , < 22666ba1420164753d7b0f5a841986b25ace5435 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "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()."
        }
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            "version": "3.1"
          },
          "scenarios": [
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              "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()\u2192nv_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."
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    "redhat_vex": {
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      "current_release_date": "2026-08-21T11:33:26+00:00",
      "cve": "CVE-2026-74548",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: forcedeth: fix UAF of txrx_stats in nv_remove",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74548.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-09T00:00:18Z",
      "cve": "CVE-2026-74548",
      "id": "CVE-2026-74548",
      "initial_release_date": "2026-08-15T23:50:32Z",
      "product_status:first_fixed": "106",
      "product_status:known_affected": "339",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "11",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74548",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74548.json",
      "version": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.