CVE-2026-63831 (GCVE-0-2026-63831)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-10-19 20:07
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
Version: 03556e4d0dbbbf4af9df76f4a3839c86f6afb015
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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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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"programFiles\": [\"net/mac802154/llsec.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.16\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.16\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.260\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.211\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.177\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.144\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.95\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.38\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/mac802154/llsec.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3a2b378b3a9ca75d3518d879148d2ad25b5714a9\"}, {\"url\": \"https://git.kernel.org/stable/c/7a831bcd0486788283ef35e396d4282ee01bb0d5\"}, {\"url\": \"https://git.kernel.org/stable/c/ff976ef7c39199ebff33c18034636595016db9f0\"}, {\"url\": \"https://git.kernel.org/stable/c/e28e7fd34c449028325322a3f5127b92594b7396\"}, {\"url\": \"https://git.kernel.org/stable/c/993fd674fe85d114e6a8d3963033d4fbbc2170a8\"}, {\"url\": \"https://git.kernel.org/stable/c/bd968bdd568beacfdf98ec537a87527e85f1d0cf\"}, {\"url\": \"https://git.kernel.org/stable/c/86d531337ea1ba02d9f2bc830d07c683d9bfaade\"}, {\"url\": \"https://git.kernel.org/stable/c/84a04eb5b210643bd67aab81ff805d32f62aa865\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.260\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.211\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.177\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.144\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.95\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.38\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.3\", \"versionStartIncluding\": \"3.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:51:40.171Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-63831\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:07:49.327Z\", \"dateReserved\": \"2026-07-19T07:54:57.015Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T12:02:24.320Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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