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CVE-2026-31532 (GCVE-0-2026-31532)

Vulnerability from cvelistv5 – Published: 2026-04-23 11:12 – Updated: 2026-08-05 12:23
VLAI
Title
can: raw: fix ro->uniq use-after-free in raw_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor. can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually]
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: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3 (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 64c8553decf5a5f2417bd54761ea0a832c56c4ca (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 3f43f12fde34737fba091b7e3ab391e14ddbb0be (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 5e9cfffad898bbeaafd0ea608a6d267362f050fc (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 572f0bf536ebc14f6e7da3d21a85cf076de8358e (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 7201a531b9a5ed892bfda5ded9194ef622de8ffa (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < 34c1741254ff972e8375faf176678a248826fe3a (git)
Affected: 514ac99c64b22d83b52dfee3b8becaa69a92bc4a , < a535a9217ca3f2fccedaafb2fddb4c48f27d36dc (git)
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Linux Linux Affected: 4.1
Unaffected: 0 , < 4.1 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - Exploitation requires local access to create/bind/close CAN_RAW sockets and race them with CAN frame delivery into raw_rcv(). Received CAN frames can trigger the vulnerable callback, but the attacker-controlled setup and free path are local socket operations.\nAC:L - The race is between attacker-controlled socket teardown/filter unregistration and attacker-controlled CAN frame generation, for example using concurrent local sockets and loopback/vcan or an existing CAN interface. No unusual external condition is required beyond timing that can be retried.\nPR:L - CAN_RAW socket creation, bind, setsockopt, send, and close in this path do not impose a CAP_NET_RAW or CAP_NET_ADMIN check for an existing CAN device. If a virtual CAN device must be created, CAP_NET_ADMIN in a user namespace may suffice, so this is still not real init-namespace root.\nUI:N - No victim action is required once the attacker can run local code. The attacker can create the sockets, register filters, generate frames, and close sockets themselves.\nS:U - The vulnerable object and resulting corruption are within the kernel networking/CAN security authority. This is a standard kernel memory corruption issue, not a cross-VM or hardware boundary escape.\nC:H - This is a use-after-free of per-CPU storage accessed from raw_rcv(), and the freed area may be reallocated before the callback reads it. Per the kernel scoring guidance, UAF memory corruption is treated as enabling high confidentiality impact.\nI:H - raw_rcv() writes skb pointers, hashes, and counters through the freed ro-\u003euniq pointer, corrupting whatever per-CPU object reuses that storage. As a UAF with kernel memory corruption, it is defensibly scored as high integrity impact.\nA:H - The stale per-CPU pointer can lead to invalid memory accesses or corruption during softirq CAN receive processing. A kernel oops/panic is a direct plausible outcome."
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      "cve": "CVE-2026-31532",
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
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      "title": "can: raw: fix ro-\u003euniq use-after-free in raw_rcv()",
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This leaves a window\\nwhere raw_rcv() may still be running in an RCU read-side critical section\\nafter raw_release() frees ro-\u003euniq, leading to a use-after-free of the\\npercpu uniq storage.\\n\\nMove free_percpu(ro-\u003euniq) out of raw_release() and into a raw-specific\\nsocket destructor. can_rx_unregister() takes an extra reference to the\\nsocket and only drops it from the RCU callback, so freeing uniq from\\nsk_destruct ensures the percpu area is not released until the relevant\\ncallbacks have drained.\\n\\n[mkl: applied manually]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/raw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"64c8553decf5a5f2417bd54761ea0a832c56c4ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"3f43f12fde34737fba091b7e3ab391e14ddbb0be\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"5e9cfffad898bbeaafd0ea608a6d267362f050fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"572f0bf536ebc14f6e7da3d21a85cf076de8358e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"7201a531b9a5ed892bfda5ded9194ef622de8ffa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"34c1741254ff972e8375faf176678a248826fe3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"514ac99c64b22d83b52dfee3b8becaa69a92bc4a\",\"lessThan\":\"a535a9217ca3f2fccedaafb2fddb4c48f27d36dc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/can/raw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.136\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.1\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.1\",\"versionEndIncluding\":\"6.6.136\",\"matchCriteriaId\":\"8685D118-4F50-41C7-BC57-C25C32A44EB6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.18\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"4C4EAA6A-7949-4B29-BD69-5BB0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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T08:49:01+00:00",
      "cve": "CVE-2026-31532",
      "id": "CVE-2026-31532",
      "initial_release_date": "2026-04-23T00:00:00+00:00",
      "product_status:fixed": "2295",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: raw: fix ro-\u003euniq use-after-free in raw_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31532.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:43:08Z",
      "cve": "CVE-2026-31532",
      "id": "CVE-2026-31532",
      "initial_release_date": "2026-04-24T01:29:32Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "667",
      "product_status:known_not_affected": "15",
      "product_status:recommended": "395",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31532",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31532.json",
      "version": "14"
    }
  }
}



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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

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.