CVE-2026-72029 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/07f5eb6d268a37bd9e131079489655cd599182e0
https://git.kernel.org/stable/c/155851e501d6c649cbcfcca6472dc26269b04b6b
https://git.kernel.org/stable/c/2b822df8e498aa6ca828e16afd8ffec27f7e4c88
https://git.kernel.org/stable/c/526b8ef54668780c8f69e0211c342763d5dcbad1
https://git.kernel.org/stable/c/55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0
https://git.kernel.org/stable/c/77f0023f22f6a2616ae128e9c93961b24ae52611

Type	Values Removed	Values Added
Description		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. 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.
Title		net: wwan: iosm: bound device offsets in the MUX downlink decoder
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/07f5eb6d268a37bd9e131079489655cd599182e0 https://git.kernel.org/stable/c/155851e501d6c649cbcfcca6472dc26269b04b6b https://git.kernel.org/stable/c/2b822df8e498aa6ca828e16afd8ffec27f7e4c88 https://git.kernel.org/stable/c/526b8ef54668780c8f69e0211c342763d5dcbad1 https://git.kernel.org/stable/c/55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0 https://git.kernel.org/stable/c/77f0023f22f6a2616ae128e9c93961b24ae52611

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72029", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.901Z", "datePublished": "2026-08-15T05:51:52.533Z", "dateUpdated": "2026-08-15T05:51:52.533Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:51:52.533Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: iosm: bound device offsets in the MUX downlink decoder\n\nmux_dl_adb_decode() walks a chain of aggregated datagram tables using\noffsets and lengths taken from the modem. first_table_index,\nnext_table_index, table_length, datagram_index and datagram_length are\nall device supplied le values. Only first_table_index was checked, and\nonly for being non zero. The decoder then formed adth = block +\nadth_index and read the table header and the datagram entries with no\nbound against the received skb. A modem that reports an index or a\nlength past the downlink buffer makes the decoder read out of bounds.\n\nThe buffer is IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE and skb->len is at most\nthat, so skb->len is the real limit, but none of these in band offsets\nwere checked against it.\n\nThe table chain is also followed with no forward progress check. The loop\ntakes the next table from adth->next_table_index and stops only when that\nreaches zero. A modem can stage two tables that point at each other, so\nthe loop never ends. It runs in softirq and clones the skb on every pass.\n\nValidate every device offset and length against skb->len before use.\nThe block header must fit. Each table header, on entry and after every\nnext_table_index, must lie inside the skb. The datagram table must fit.\nEach datagram index and length must stay inside the skb. The header\npadding must not exceed the datagram length so the receive length does\nnot wrap. Require each next_table_index to move forward so the chain\ncannot cycle.\n\nThis was reproduced under KASAN as a slab out of bounds read on a normal\ndownlink receive once the iosm net device is up."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"], "versions": [{"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "155851e501d6c649cbcfcca6472dc26269b04b6b", "status": "affected", "versionType": "git"}, {"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "2b822df8e498aa6ca828e16afd8ffec27f7e4c88", "status": "affected", "versionType": "git"}, {"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0", "status": "affected", "versionType": "git"}, {"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "07f5eb6d268a37bd9e131079489655cd599182e0", "status": "affected", "versionType": "git"}, {"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "77f0023f22f6a2616ae128e9c93961b24ae52611", "status": "affected", "versionType": "git"}, {"version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "lessThan": "526b8ef54668780c8f69e0211c342763d5dcbad1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.2-rc2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/155851e501d6c649cbcfcca6472dc26269b04b6b"}, {"url": "https://git.kernel.org/stable/c/2b822df8e498aa6ca828e16afd8ffec27f7e4c88"}, {"url": "https://git.kernel.org/stable/c/55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0"}, {"url": "https://git.kernel.org/stable/c/07f5eb6d268a37bd9e131079489655cd599182e0"}, {"url": "https://git.kernel.org/stable/c/77f0023f22f6a2616ae128e9c93961b24ae52611"}, {"url": "https://git.kernel.org/stable/c/526b8ef54668780c8f69e0211c342763d5dcbad1"}], "title": "net: wwan: iosm: bound device offsets in the MUX downlink decoder", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "155851e501d6c649cbcfcca6472dc26269b04b6b", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}, {"lessThan": "2b822df8e498aa6ca828e16afd8ffec27f7e4c88", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}, {"lessThan": "55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}, {"lessThan": "07f5eb6d268a37bd9e131079489655cd599182e0", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}, {"lessThan": "77f0023f22f6a2616ae128e9c93961b24ae52611", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}, {"lessThan": "526b8ef54668780c8f69e0211c342763d5dcbad1", "status": "affected", "version": "1f52d7b622854b8bd7a1be3de095ca2e1f77098e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wwan/iosm/iosm_ipc_mux_codec.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: iosm: bound device offsets in the MUX downlink decoder\n\nmux_dl_adb_decode() walks a chain of aggregated datagram tables using\noffsets and lengths taken from the modem. first_table_index,\nnext_table_index, table_length, datagram_index and datagram_length are\nall device supplied le values. Only first_table_index was checked, and\nonly for being non zero. The decoder then formed adth = block +\nadth_index and read the table header and the datagram entries with no\nbound against the received skb. A modem that reports an index or a\nlength past the downlink buffer makes the decoder read out of bounds.\n\nThe buffer is IPC_MEM_MAX_DL_MUX_LITE_BUF_SIZE and skb->len is at most\nthat, so skb->len is the real limit, but none of these in band offsets\nwere checked against it.\n\nThe table chain is also followed with no forward progress check. The loop\ntakes the next table from adth->next_table_index and stops only when that\nreaches zero. A modem can stage two tables that point at each other, so\nthe loop never ends. It runs in softirq and clones the skb on every pass.\n\nValidate every device offset and length against skb->len before use.\nThe block header must fit. Each table header, on entry and after every\nnext_table_index, must lie inside the skb. The datagram table must fit.\nEach datagram index and length must stay inside the skb. The header\npadding must not exceed the datagram length so the receive length does\nnot wrap. Require each next_table_index to move forward so the chain\ncannot cycle.\n\nThis was reproduced under KASAN as a slab out of bounds read on a normal\ndownlink receive once the iosm net device is up."}], "id": "CVE-2026-72029", "lastModified": "2026-08-15T06:21:02.083", "metrics": {}, "published": "2026-08-15T06:21:02.083", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/07f5eb6d268a37bd9e131079489655cd599182e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/155851e501d6c649cbcfcca6472dc26269b04b6b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b822df8e498aa6ca828e16afd8ffec27f7e4c88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/526b8ef54668780c8f69e0211c342763d5dcbad1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/55cfea8e8d9117ad086d1e1a0ff87f306f8e3ad0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/77f0023f22f6a2616ae128e9c93961b24ae52611"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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