mac802154: llsec: add skb_cow_data() before in-place crypto
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/c
CVE-2026-63831
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-63831
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-63831
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40843 · Revision 1
- Added to Heist Feed
- Publisher date