net: wwan: iosm: bound device offsets in the MUX downlink decoder
In the Linux kernel, the following vulnerability has been resolved: net: wwan: iosm: bound device offsets in the MUX downlink decoder mux_dl_adb_decode() walks a chain of aggregated datagram tables using offsets and lengths taken from the modem. first_table_index, next_table_index, table_length, datagram_index and datagram_length are all device supplied le values. Only first_table_index was checked, and only for being non zero. The decoder then formed adth = block + adth_index and read the table header and the datagram entries with no bound against the received skb. A modem that reports an index or a length past the downlink buffer makes the decoder read out of bounds. The buffer is IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE and skb->len is at most that, so skb->len is the real limit, but none of these in band offsets were checked against it. The table chain is also followed with no forward progress check. The loop takes the next table from adth->next_table_index and stops only when that reaches zero. A modem can stage two tables that point at each other, so the loop never ends. It runs in softirq and clones the skb on every pass. Validate every device offset and length against skb->len before use. The block header must fit. Each table header, on entry and after every next_table_index, must lie inside the skb. The datagram table must fit. Each datagram index and length must stay inside the skb. The header padding must not exceed the datagram length so the receive length does not wrap.
CVE-2026-72029
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-2026-72029
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": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "155851e501d6c649cbcfcca6472dc26269b04b6b",
"versionType": "git"
},
{
"status": "affected",
"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "2b822df8e498aa6ca828e16afd8ffec27f7e4c88",
"versionType": "git"
},
{
"status": "affected",
"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0",
"versionType": "git"
},
{
"status": "affected",
"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "07f5eb6d268a37bd9e131079489655cd599182e0",
"versionType": "git"
},
{
"status": "affected",
"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "77f0023f22f6a2616ae128e9c93961b24ae52611",
"versionType": "git"
},
{
"status": "affected",
"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e",
"lessThan": "526b8ef54668780c8f69e0211c342763d5dcbad1",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72029
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41844 · Revision 1
- Added to Heist Feed
- Publisher date