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CVE-2026-63831 (GCVE-0-2026-63831)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-08-17 04:51
VLAI
Title
mac802154: llsec: add skb_cow_data() before in-place crypto
Summary
In the Linux kernel, the following vulnerability has been resolved: mac802154: llsec: add skb_cow_data() before in-place crypto llsec_do_encrypt_unauth(), llsec_do_encrypt_auth(), llsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform in-place cryptographic transformations on skb data. They build a scatterlist with sg_init_one() pointing into the skb's linear data area and then pass the same scatterlist as both src and dst to the crypto API (e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt). On the RX path, __ieee802154_rx_handle_packet() clones the received skb before handing it to each subscriber via ieee802154_subif_frame(). The cloned skb shares the same underlying data buffer via reference counting. When llsec_do_decrypt() subsequently modifies this shared buffer in place, it corrupts data that other clones -- potentially belonging to other sockets or subsystems -- still reference. On the TX path, similar data sharing can occur when an skb's head has been cloned (skb_cloned() returns true). The fix is to call skb_cow_data() before performing any in-place crypto operation. skb_cow_data() ensures that the skb's data area is not shared: if the skb head is cloned or the data spans multiple fragments, it copies the data into a private buffer that can be safely modified in place. This is the same pattern used by: - ESP (net/ipv4/esp4.c, net/ipv6/esp6.c) - MACsec (drivers/net/macsec.c) - WireGuard (drivers/net/wireguard/receive.c) - TIPC (net/tipc/crypto.c) Without this guard, in-place crypto on shared skb data leads to: - Silent data corruption of other skb clones - Use-after-free when the crypto API scatterwalk writes through a page that has already been freed by another clone's kfree_skb() - Kernel crashes under concurrent 802.15.4 traffic with security enabled (KASAN/KMSAN reports slab-use-after-free) Found by 0sec (https://0sec.ai) using automated source analysis.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < 3a2b378b3a9ca75d3518d879148d2ad25b5714a9 (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < 7a831bcd0486788283ef35e396d4282ee01bb0d5 (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < ff976ef7c39199ebff33c18034636595016db9f0 (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < e28e7fd34c449028325322a3f5127b92594b7396 (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < 993fd674fe85d114e6a8d3963033d4fbbc2170a8 (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < bd968bdd568beacfdf98ec537a87527e85f1d0cf (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < 86d531337ea1ba02d9f2bc830d07c683d9bfaade (git)
Affected: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015 , < 84a04eb5b210643bd67aab81ff805d32f62aa865 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: llsec: add skb_cow_data() before in-place crypto\n\nllsec_do_encrypt_unauth(), llsec_do_encrypt_auth(),\nllsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform\nin-place cryptographic transformations on skb data.  They build a\nscatterlist with sg_init_one() pointing into the skb\u0027s linear data area\nand then pass the same scatterlist as both src and dst to the crypto API\n(e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt).\n\nOn the RX path, __ieee802154_rx_handle_packet() clones the received skb\nbefore handing it to each subscriber via ieee802154_subif_frame().  The\ncloned skb shares the same underlying data buffer via reference\ncounting.  When llsec_do_decrypt() subsequently modifies this shared\nbuffer in place, it corrupts data that other clones -- potentially\nbelonging to other sockets or subsystems -- still reference.\n\nOn the TX path, similar data sharing can occur when an skb\u0027s head has\nbeen cloned (skb_cloned() returns true).\n\nThe fix is to call skb_cow_data() before performing any in-place crypto\noperation.  skb_cow_data() ensures that the skb\u0027s data area is not\nshared: if the skb head is cloned or the data spans multiple fragments,\nit copies the data into a private buffer that can be safely modified in\nplace.  This is the same pattern used by:\n\n  - ESP (net/ipv4/esp4.c, net/ipv6/esp6.c)\n  - MACsec (drivers/net/macsec.c)\n  - WireGuard (drivers/net/wireguard/receive.c)\n  - TIPC (net/tipc/crypto.c)\n\nWithout this guard, in-place crypto on shared skb data leads to:\n  - Silent data corruption of other skb clones\n  - Use-after-free when the crypto API scatterwalk writes through a\n    page that has already been freed by another clone\u0027s kfree_skb()\n  - Kernel crashes under concurrent 802.15.4 traffic with security\n    enabled (KASAN/KMSAN reports slab-use-after-free)\n\nFound by 0sec (https://0sec.ai) using automated source analysis."
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              "value": "AV:A - The bug is reached when the kernel processes incoming IEEE 802.15.4 frames from a radio driver (ieee802154_rx \u2192 llsec_do_decrypt), which requires an attacker within WPAN radio range, analogous to Bluetooth/WiFi adjacent-segment attacks.\nAC:L - An attacker can reliably trigger the flaw by transmitting valid LLSEC-protected 802.15.4 frames (including broadcast frames fanning out to multiple virtual interfaces) and controlling traffic timing; the skb_clone sharing is deterministic on the RX path.\nPR:N - Exploitation requires no local privileges on the victim\u2014only the ability to send 802.15.4 radio frames as a PAN participant with valid LLSEC credentials, which is a network-position requirement rather than elevated kernel access.\nUI:N - No end-user action is needed at exploitation time; triggering the bug only requires the target to already be running mac802154 with LLSEC enabled and receiving attacker-crafted wireless frames.\nS:U - Impact is confined to kernel memory/subsystems on the affected host (UAF, data corruption, crash); it does not inherently cross a VM, container, or IOMMU security boundary.\nC:H - The commit and fix description confirm slab use-after-free from in-place crypto scatterwalk writes through skb data pages freed by sibling clones, enabling arbitrary kernel memory reads.\nI:H - Writing through freed/shared skb pages during in-place decrypt/encrypt corrupts kernel heap contents and provides a standard exploitable memory-corruption primitive for arbitrary modification or code execution.\nA:H - Concurrent LLSEC-enabled 802.15.4 traffic can cause kernel oops/panic, and KASAN/KMSAN reports confirm slab-use-after-free crashes under the vulnerable code path."
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      "title": "mac802154: llsec: add skb_cow_data() before in-place crypto",
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    "cveId": "CVE-2026-63831",
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    "dateUpdated": "2026-08-17T04:51:40.171Z",
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      "date": "2026-09-17",
      "epss": "0.00252",
      "percentile": "0.16822"
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      "current_release_date": "2026-08-14T17:53:23.000Z",
      "cve": "CVE-2026-63831",
      "id": "msrc_CVE-2026-63831",
      "initial_release_date": "2026-07-20T01:07:01.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "mac802154: llsec: add skb_cow_data() before in-place crypto",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63831.json",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63831\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:56.460\",\"lastModified\":\"2026-08-17T05:17:20.940\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmac802154: llsec: add skb_cow_data() before in-place crypto\\n\\nllsec_do_encrypt_unauth(), llsec_do_encrypt_auth(),\\nllsec_do_decrypt_unauth(), and llsec_do_decrypt_auth() all perform\\nin-place cryptographic transformations on skb data.  They build a\\nscatterlist with sg_init_one() pointing into the skb\u0027s linear data area\\nand then pass the same scatterlist as both src and dst to the crypto API\\n(e.g. crypto_skcipher_encrypt/decrypt, crypto_aead_encrypt/decrypt).\\n\\nOn the RX path, __ieee802154_rx_handle_packet() clones the received skb\\nbefore handing it to each subscriber via ieee802154_subif_frame().  The\\ncloned skb shares the same underlying data buffer via reference\\ncounting.  When llsec_do_decrypt() subsequently modifies this shared\\nbuffer in place, it corrupts data that other clones -- potentially\\nbelonging to other sockets or subsystems -- still reference.\\n\\nOn the TX path, similar data sharing can occur when an skb\u0027s head has\\nbeen cloned (skb_cloned() returns true).\\n\\nThe fix is to call skb_cow_data() before performing any in-place crypto\\noperation.  skb_cow_data() ensures that the skb\u0027s data area is not\\nshared: if the skb head is cloned or the data spans multiple fragments,\\nit copies the data into a private buffer that can be safely modified in\\nplace.  This is the same pattern used by:\\n\\n  - ESP (net/ipv4/esp4.c, net/ipv6/esp6.c)\\n  - MACsec (drivers/net/macsec.c)\\n  - WireGuard (drivers/net/wireguard/receive.c)\\n  - TIPC (net/tipc/crypto.c)\\n\\nWithout this guard, in-place crypto on shared skb data leads to:\\n  - Silent data corruption of other skb clones\\n  - Use-after-free when the crypto API scatterwalk writes through a\\n    page that has already been freed by another clone\u0027s kfree_skb()\\n  - Kernel crashes under concurrent 802.15.4 traffic with security\\n    enabled (KASAN/KMSAN reports slab-use-after-free)\\n\\nFound by 0sec (https://0sec.ai) using automated source analysis.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/mac802154/llsec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"3a2b378b3a9ca75d3518d879148d2ad25b5714a9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"7a831bcd0486788283ef35e396d4282ee01bb0d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"ff976ef7c39199ebff33c18034636595016db9f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"e28e7fd34c449028325322a3f5127b92594b7396\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"993fd674fe85d114e6a8d3963033d4fbbc2170a8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"bd968bdd568beacfdf98ec537a87527e85f1d0cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"86d531337ea1ba02d9f2bc830d07c683d9bfaade\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"03556e4d0dbbbf4af9df76f4a3839c86f6afb015\",\"lessThan\":\"84a04eb5b210643bd67aab81ff805d32f62aa865\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/mac802154/llsec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3a2b378b3a9ca75d3518d879148d2ad25b5714a9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a831bcd0486788283ef35e396d4282ee01bb0d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84a04eb5b210643bd67aab81ff805d32f62aa865\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86d531337ea1ba02d9f2bc830d07c683d9bfaade\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/993fd674fe85d114e6a8d3963033d4fbbc2170a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd968bdd568beacfdf98ec537a87527e85f1d0cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e28e7fd34c449028325322a3f5127b92594b7396\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff976ef7c39199ebff33c18034636595016db9f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-05T14:03:22+00:00",
      "cve": "CVE-2026-63831",
      "id": "CVE-2026-63831",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mac802154: llsec: add skb_cow_data() before in-place crypto",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63831.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T16:49:34Z",
      "cve": "CVE-2026-63831",
      "id": "CVE-2026-63831",
      "initial_release_date": "2026-07-19T17:34:33Z",
      "product_status:first_fixed": "2",
      "product_status:known_not_affected": "345",
      "product_status:recommended": "149",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63831",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63831.json",
      "version": "13"
    }
  }
}



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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.