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

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
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
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)
Create a notification for this product.
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-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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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    "datePublished": "2026-07-19T12:02:24.320Z",
    "dateReserved": "2026-07-19T07:54:57.015Z",
    "dateUpdated": "2026-07-20T13:40:34.698Z",
    "state": "PUBLISHED"
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      "date": "2026-07-21",
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      "cve": "CVE-2026-63831",
      "id": "msrc_CVE-2026-63831",
      "initial_release_date": "2026-07-20T01:07:01.000Z",
      "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",
      "version": "3"
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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-rc1\",\"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": "2026-07-20T16:41:41+00:00",
      "cve": "CVE-2026-63831",
      "id": "CVE-2026-63831",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "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"
    }
  }
}



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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.