net: wwan: iosm: bound device offsets in the MUX downlink decoder

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72029
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:02 UTC
Updated2026-08-17 06:18:00 UTC
DescriptionIn 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. Require each next_table_index to move forward so the chain cannot cycle. This was reproduced under KASAN as a slab out of bounds read on a normal downlink receive once the iosm net device is up.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.004030000 probability, percentile 0.334510000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 155851e501d6c649cbcfcca6472dc26269b04b6b git Not specified
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 2b822df8e498aa6ca828e16afd8ffec27f7e4c88 git Not specified
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0 git Not specified
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 07f5eb6d268a37bd9e131079489655cd599182e0 git Not specified
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 77f0023f22f6a2616ae128e9c93961b24ae52611 git Not specified
CNA Linux Linux affected 1f52d7b622854b8bd7a1be3de095ca2e1f77098e 526b8ef54668780c8f69e0211c342763d5dcbad1 git Not specified
CNA Linux Linux affected 5.18 Not specified
CNA Linux Linux unaffected 5.18 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/526b8ef54668780c8f69e0211c342763d5dcbad1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/77f0023f22f6a2616ae128e9c93961b24ae52611 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b822df8e498aa6ca828e16afd8ffec27f7e4c88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07f5eb6d268a37bd9e131079489655cd599182e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/155851e501d6c649cbcfcca6472dc26269b04b6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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