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
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)
Create a notification for this product.
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)
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        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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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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      "title": "can: raw: fix ro-\u003euniq use-after-free in raw_rcv()",
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    "cveId": "CVE-2026-31532",
    "datePublished": "2026-04-23T11:12:44.829Z",
    "dateReserved": "2026-03-09T15:48:24.112Z",
    "dateUpdated": "2026-08-05T12:23:19.603Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-31532",
      "id": "msrc_CVE-2026-31532",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "can: raw: fix ro-\u003euniq use-after-free in raw_rcv()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31532.json",
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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": "2026-08-03T23:48:35Z",
      "cve": "CVE-2026-31532",
      "id": "CVE-2026-31532",
      "initial_release_date": "2026-04-24T01:29:32Z",
      "product_status:known_affected": "597",
      "product_status:known_not_affected": "27",
      "product_status:recommended": "243",
      "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": "11"
    }
  }
}



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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.