Vulnerability-Lookup

CVE-2026-74726 (GCVE-0-2026-74726)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33

Title

bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor

Summary

In the Linux kernel, the following vulnerability has been resolved: bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor bond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and takes RTNL via rtnl_trylock() before undoing the promiscuity it set on the active slave. In that window the active slave can change under RTNL (RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()), which already drops the promiscuity and clears primary_is_promisc. The monitor still acts on the stale decision: if the slave was removed with no failover, curr_active_slave is now NULL and the deref faults; if it failed over, the stale dev_set_promiscuity(-1) underflows the new slave's promiscuity counter and pins it in IFF_PROMISC. Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: b42 bond_alb_monitor RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) Kernel panic - not syncing: Fatal exception Re-check primary_is_promisc (and curr_active_slave) after taking RTNL so the monitor only undoes an increment it still owns. The other bonding monitors already re-read state under RTNL in their commit phase (bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only one acting on the pre-trylock decision.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/f7668762bf5fd6db9…
https://git.kernel.org/stable/c/09add8d5cfa9c4682…
https://git.kernel.org/stable/c/b82f51681a7a88c7d…
https://git.kernel.org/stable/c/dd148539fb4741d01…
https://git.kernel.org/stable/c/dccec0227ed8d9e36…
https://git.kernel.org/stable/c/2faf75a8a06504071…
https://git.kernel.org/stable/c/257c4a3a34d8f51ef…
https://git.kernel.org/stable/c/683c6ba6e58e6ed10…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < f7668762bf5fd6db9397de5c0514407489d9d815 (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < 09add8d5cfa9c46828f51eaad162c36e86366b71 (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < b82f51681a7a88c7d3c865e817a3340d42b5fa2a (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < dd148539fb4741d01c06b7d2c8bd84b01920756c (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < dccec0227ed8d9e36936d66e256b957dc2858468 (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < 2faf75a8a06504071b4c0aea7e45a9cc49a4e187 (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < 257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2 (git) Affected: d0e81b7e2246a41d068ecaf15aac9de570816d63 , < 683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d (git)	guessed
Linux	Linux	Affected: 2.6.24 Unaffected: 0 , < 2.6.24 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_alb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "versionType": "git"
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              "versionType": "git"
            },
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          "vendor": "Linux",
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              "version": "2.6.24"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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": "5.10.265",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "2.6.24",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -\u003e __bond_release_one() -\u003e bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave\u0027s\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:17.128Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"
        },
        {
          "url": "https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"
        },
        {
          "url": "https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"
        },
        {
          "url": "https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"
        },
        {
          "url": "https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"
        },
        {
          "url": "https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"
        },
        {
          "url": "https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"
        }
      ],
      "title": "bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74726",
    "datePublished": "2026-08-22T15:33:17.128Z",
    "dateReserved": "2026-08-15T05:44:03.929Z",
    "dateUpdated": "2026-08-22T15:33:17.128Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74726\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:47.673\",\"lastModified\":\"2026-08-22T16:16:47.673\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\\n\\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\\nactive slave. In that window the active slave can change under RTNL\\n(RTM_DELLINK -\u003e __bond_release_one() -\u003e bond_alb_handle_active_change()),\\nwhich already drops the promiscuity and clears primary_is_promisc. The\\nmonitor still acts on the stale decision: if the slave was removed with no\\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\\nover, the stale dev_set_promiscuity(-1) underflows the new slave\u0027s\\npromiscuity counter and pins it in IFF_PROMISC.\\n\\n  Oops: general protection fault, probably for non-canonical address ...\\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\n  Workqueue: b42 bond_alb_monitor\\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\\n   process_one_work (kernel/workqueue.c:3322)\\n   worker_thread (kernel/workqueue.c:3486)\\n   kthread (kernel/kthread.c:436)\\n   ret_from_fork (arch/x86/kernel/process.c:158)\\n  Kernel panic - not syncing: Fatal exception\\n\\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\\nthe monitor only undoes an increment it still owns. The other bonding\\nmonitors already re-read state under RTNL in their commit phase\\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\\none acting on the pre-trylock decision.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/bonding/bond_alb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"f7668762bf5fd6db9397de5c0514407489d9d815\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"09add8d5cfa9c46828f51eaad162c36e86366b71\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"b82f51681a7a88c7d3c865e817a3340d42b5fa2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"dd148539fb4741d01c06b7d2c8bd84b01920756c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"dccec0227ed8d9e36936d66e256b957dc2858468\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"2faf75a8a06504071b4c0aea7e45a9cc49a4e187\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d0e81b7e2246a41d068ecaf15aac9de570816d63\",\"lessThan\":\"683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/bonding/bond_alb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.24\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.24\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-74726

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-22 16:16

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_alb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f7668762bf5fd6db9397de5c0514407489d9d815",
              "status": "affected",
              "version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
              "versionType": "git"
            },
            {
              "lessThan": "09add8d5cfa9c46828f51eaad162c36e86366b71",
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              "versionType": "git"
            },
            {
              "lessThan": "b82f51681a7a88c7d3c865e817a3340d42b5fa2a",
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              "version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
              "versionType": "git"
            },
            {
              "lessThan": "dd148539fb4741d01c06b7d2c8bd84b01920756c",
              "status": "affected",
              "version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
              "versionType": "git"
            },
            {
              "lessThan": "dccec0227ed8d9e36936d66e256b957dc2858468",
              "status": "affected",
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            },
            {
              "lessThan": "2faf75a8a06504071b4c0aea7e45a9cc49a4e187",
              "status": "affected",
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              "versionType": "git"
            },
            {
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_alb.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -\u003e __bond_release_one() -\u003e bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave\u0027s\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision."
    }
  ],
  "id": "CVE-2026-74726",
  "lastModified": "2026-08-22T16:16:47.673",
  "metrics": {},
  "published": "2026-08-22T16:16:47.673",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-33V4-FJQ4-GJWG

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30

Details

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

bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor

bond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and takes RTNL via rtnl_trylock() before undoing the promiscuity it set on the active slave. In that window the active slave can change under RTNL (RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()), which already drops the promiscuity and clears primary_is_promisc. The monitor still acts on the stale decision: if the slave was removed with no failover, curr_active_slave is now NULL and the deref faults; if it failed over, the stale dev_set_promiscuity(-1) underflows the new slave's promiscuity counter and pins it in IFF_PROMISC.

Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: b42 bond_alb_monitor RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) Kernel panic - not syncing: Fatal exception

Re-check primary_is_promisc (and curr_active_slave) after taking RTNL so the monitor only undoes an increment it still owns. The other bonding monitors already re-read state under RTNL in their commit phase (bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only one acting on the pre-trylock decision.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74726"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:47Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -\u003e __bond_release_one() -\u003e bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave\u0027s\npromiscuity counter and pins it in IFF_PROMISC.\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n  Workqueue: b42 bond_alb_monitor\n  RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n  Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision.",
  "id": "GHSA-33v4-fjq4-gjwg",
  "modified": "2026-08-22T18:30:30Z",
  "published": "2026-08-22T18:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74726"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-74726 (GCVE-0-2026-74726)

FKIE_CVE-2026-74726

GHSA-33V4-FJQ4-GJWG

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