CVE-2026-64450 (GCVE-0-2026-64450)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
EPSS
VEX
Title
tipc: fix out-of-bounds read in broadcast Gap ACK blocks
Summary
In the Linux kernel, the following vulnerability has been resolved:
tipc: fix out-of-bounds read in broadcast Gap ACK blocks
A broadcast PROTOCOL/STATE_MSG can carry a Gap ACK blocks record in its
data area. tipc_get_gap_ack_blks() only verifies that the record's len
field is self-consistent with its ugack_cnt/bgack_cnt counts
(sz == struct_size(p, gacks, ugack_cnt + bgack_cnt)); it does not check
that the record actually fits in the message data area, msg_data_sz().
The unicast caller tipc_link_proto_rcv() bounds it ("if (glen > dlen)
break;"), but the broadcast caller tipc_bcast_sync_rcv() discards the
returned size, so tipc_link_advance_transmq() copies the record off the
receive skb with an attacker-controlled count:
this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt),
GFP_ATOMIC);
A TIPC neighbour that negotiated TIPC_GAP_ACK_BLOCK triggers it with one
ordinary broadcast STATE_MSG (msg_bc_ack_invalid() clear), sized so its
data area is short, carrying a Gap ACK record with len = 0x400,
bgack_cnt = 0xff and ugack_cnt = 0. len then equals
struct_size(p, gacks, 255), so the consistency check passes and ga is
non-NULL; kmemdup() reads struct_size(ga, gacks, 255) = 1024 bytes out
of the much smaller skb:
BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x48/0x60
Read of size 1024 at addr ffff0000c7030d38 by task poc864/69
Call trace:
kmemdup_noprof+0x48/0x60
tipc_link_advance_transmq+0x86c/0xb80
tipc_link_bc_ack_rcv+0x19c/0x1e0
tipc_bcast_sync_rcv+0x1c4/0x2c4
tipc_rcv+0x85c/0x1340
tipc_l2_rcv_msg+0xac/0x104
The buggy address belongs to the object at ffff0000c7030d00
which belongs to the cache skbuff_small_head of size 704
The buggy address is located 56 bytes inside of
allocated 704-byte region [ffff0000c7030d00, ffff0000c7030fc0)
The copied-out bytes are subsequently consumed as gap/ack values, but
the read is already out of bounds at the kmemdup() regardless of how
they are used.
The unicast STATE path drops such a message: "if (glen > dlen) break;"
skips the rest of STATE_MSG handling and the skb is freed. Make the
broadcast path drop it too. tipc_bcast_sync_rcv() now bounds the record
against msg_data_sz() and, when it does not fit, reports it back through
tipc_node_bc_sync_rcv() to tipc_rcv() so the skb is discarded rather than
processed. ga is not cleared on this path: ga == NULL already means
"legacy peer without Selective ACK", a distinct legitimate state.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 055663d21dc4336f67933ab26bef3c5934be6324
(git)
Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 016f5995c37a5a2c45198308f830f244517d70b7 (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 74b45af86a767594ba52330cd440ea84e24d700d (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 9a51115fcdc78687c8852bf93a1db3951dbb223b (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < a21ed5064217cc33726da6c7ef1a520eba43aea1 (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 2de42e268174766cb2e2b90721afdfdff70e0d8d (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < f333b6851bdf326fd2134133272dbbed0c94d921 (git) Affected: d7626b5acff9227e2a65da636a53e09bdafdc0aa , < 2b66974a1b6134a4bbc3bfed181f7418f688eb54 (git) |
|
| Linux | Linux |
Affected:
5.8
Unaffected: 0 , < 5.8 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc2 , ≤ * (original_commit_for_fix) |
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"version": "5.15.212",
"versionType": "semver"
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{
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"versionType": "semver"
},
{
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"status": "unaffected",
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{
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"version": "7.2-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix out-of-bounds read in broadcast Gap ACK blocks\n\nA broadcast PROTOCOL/STATE_MSG can carry a Gap ACK blocks record in its\ndata area. tipc_get_gap_ack_blks() only verifies that the record\u0027s len\nfield is self-consistent with its ugack_cnt/bgack_cnt counts\n(sz == struct_size(p, gacks, ugack_cnt + bgack_cnt)); it does not check\nthat the record actually fits in the message data area, msg_data_sz().\n\nThe unicast caller tipc_link_proto_rcv() bounds it (\"if (glen \u003e dlen)\nbreak;\"), but the broadcast caller tipc_bcast_sync_rcv() discards the\nreturned size, so tipc_link_advance_transmq() copies the record off the\nreceive skb with an attacker-controlled count:\n\n\tthis_ga = kmemdup(ga, struct_size(ga, gacks, ga-\u003ebgack_cnt),\n\t\t\t GFP_ATOMIC);\n\nA TIPC neighbour that negotiated TIPC_GAP_ACK_BLOCK triggers it with one\nordinary broadcast STATE_MSG (msg_bc_ack_invalid() clear), sized so its\ndata area is short, carrying a Gap ACK record with len = 0x400,\nbgack_cnt = 0xff and ugack_cnt = 0. len then equals\nstruct_size(p, gacks, 255), so the consistency check passes and ga is\nnon-NULL; kmemdup() reads struct_size(ga, gacks, 255) = 1024 bytes out\nof the much smaller skb:\n\n BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x48/0x60\n Read of size 1024 at addr ffff0000c7030d38 by task poc864/69\n Call trace:\n kmemdup_noprof+0x48/0x60\n tipc_link_advance_transmq+0x86c/0xb80\n tipc_link_bc_ack_rcv+0x19c/0x1e0\n tipc_bcast_sync_rcv+0x1c4/0x2c4\n tipc_rcv+0x85c/0x1340\n tipc_l2_rcv_msg+0xac/0x104\n The buggy address belongs to the object at ffff0000c7030d00\n which belongs to the cache skbuff_small_head of size 704\n The buggy address is located 56 bytes inside of\n allocated 704-byte region [ffff0000c7030d00, ffff0000c7030fc0)\n\nThe copied-out bytes are subsequently consumed as gap/ack values, but\nthe read is already out of bounds at the kmemdup() regardless of how\nthey are used.\n\nThe unicast STATE path drops such a message: \"if (glen \u003e dlen) break;\"\nskips the rest of STATE_MSG handling and the skb is freed. Make the\nbroadcast path drop it too. tipc_bcast_sync_rcv() now bounds the record\nagainst msg_data_sz() and, when it does not fit, reports it back through\ntipc_node_bc_sync_rcv() to tipc_rcv() so the skb is discarded rather than\nprocessed. ga is not cleared on this path: ga == NULL already means\n\"legacy peer without Selective ACK\", a distinct legitimate state."
}
],
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"dateUpdated": "2026-07-25T08:51:20.319Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"references": [
{
"url": "https://git.kernel.org/stable/c/055663d21dc4336f67933ab26bef3c5934be6324"
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{
"url": "https://git.kernel.org/stable/c/016f5995c37a5a2c45198308f830f244517d70b7"
},
{
"url": "https://git.kernel.org/stable/c/74b45af86a767594ba52330cd440ea84e24d700d"
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{
"url": "https://git.kernel.org/stable/c/9a51115fcdc78687c8852bf93a1db3951dbb223b"
},
{
"url": "https://git.kernel.org/stable/c/a21ed5064217cc33726da6c7ef1a520eba43aea1"
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{
"url": "https://git.kernel.org/stable/c/2de42e268174766cb2e2b90721afdfdff70e0d8d"
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"url": "https://git.kernel.org/stable/c/f333b6851bdf326fd2134133272dbbed0c94d921"
},
{
"url": "https://git.kernel.org/stable/c/2b66974a1b6134a4bbc3bfed181f7418f688eb54"
}
],
"title": "tipc: fix out-of-bounds read in broadcast Gap ACK blocks",
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64450",
"datePublished": "2026-07-25T08:51:20.319Z",
"dateReserved": "2026-07-19T15:36:31.788Z",
"dateUpdated": "2026-07-25T08:51:20.319Z",
"state": "PUBLISHED"
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"cve": "CVE-2026-64450",
"date": "2026-07-26",
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},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-64450\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:29.850\",\"lastModified\":\"2026-07-25T10:17:29.850\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntipc: fix out-of-bounds read in broadcast Gap ACK blocks\\n\\nA broadcast PROTOCOL/STATE_MSG can carry a Gap ACK blocks record in its\\ndata area. tipc_get_gap_ack_blks() only verifies that the record\u0027s len\\nfield is self-consistent with its ugack_cnt/bgack_cnt counts\\n(sz == struct_size(p, gacks, ugack_cnt + bgack_cnt)); it does not check\\nthat the record actually fits in the message data area, msg_data_sz().\\n\\nThe unicast caller tipc_link_proto_rcv() bounds it (\\\"if (glen \u003e dlen)\\nbreak;\\\"), but the broadcast caller tipc_bcast_sync_rcv() discards the\\nreturned size, so tipc_link_advance_transmq() copies the record off the\\nreceive skb with an attacker-controlled count:\\n\\n\\tthis_ga = kmemdup(ga, struct_size(ga, gacks, ga-\u003ebgack_cnt),\\n\\t\\t\\t GFP_ATOMIC);\\n\\nA TIPC neighbour that negotiated TIPC_GAP_ACK_BLOCK triggers it with one\\nordinary broadcast STATE_MSG (msg_bc_ack_invalid() clear), sized so its\\ndata area is short, carrying a Gap ACK record with len = 0x400,\\nbgack_cnt = 0xff and ugack_cnt = 0. len then equals\\nstruct_size(p, gacks, 255), so the consistency check passes and ga is\\nnon-NULL; kmemdup() reads struct_size(ga, gacks, 255) = 1024 bytes out\\nof the much smaller skb:\\n\\n BUG: KASAN: slab-out-of-bounds in kmemdup_noprof+0x48/0x60\\n Read of size 1024 at addr ffff0000c7030d38 by task poc864/69\\n Call trace:\\n kmemdup_noprof+0x48/0x60\\n tipc_link_advance_transmq+0x86c/0xb80\\n tipc_link_bc_ack_rcv+0x19c/0x1e0\\n tipc_bcast_sync_rcv+0x1c4/0x2c4\\n tipc_rcv+0x85c/0x1340\\n tipc_l2_rcv_msg+0xac/0x104\\n The buggy address belongs to the object at ffff0000c7030d00\\n which belongs to the cache skbuff_small_head of size 704\\n The buggy address is located 56 bytes inside of\\n allocated 704-byte region [ffff0000c7030d00, ffff0000c7030fc0)\\n\\nThe copied-out bytes are subsequently consumed as gap/ack values, but\\nthe read is already out of bounds at the kmemdup() regardless of how\\nthey are used.\\n\\nThe unicast STATE path drops such a message: \\\"if (glen \u003e dlen) break;\\\"\\nskips the rest of STATE_MSG handling and the skb is freed. Make the\\nbroadcast path drop it too. tipc_bcast_sync_rcv() now bounds the record\\nagainst msg_data_sz() and, when it does not fit, reports it back through\\ntipc_node_bc_sync_rcv() to tipc_rcv() so the skb is discarded rather than\\nprocessed. ga is not cleared on this path: ga == NULL already means\\n\\\"legacy peer without Selective ACK\\\", a distinct legitimate state.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/tipc/bcast.c\",\"net/tipc/bcast.h\",\"net/tipc/node.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"055663d21dc4336f67933ab26bef3c5934be6324\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"016f5995c37a5a2c45198308f830f244517d70b7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"74b45af86a767594ba52330cd440ea84e24d700d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"9a51115fcdc78687c8852bf93a1db3951dbb223b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"a21ed5064217cc33726da6c7ef1a520eba43aea1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"2de42e268174766cb2e2b90721afdfdff70e0d8d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"f333b6851bdf326fd2134133272dbbed0c94d921\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d7626b5acff9227e2a65da636a53e09bdafdc0aa\",\"lessThan\":\"2b66974a1b6134a4bbc3bfed181f7418f688eb54\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/tipc/bcast.c\",\"net/tipc/bcast.h\",\"net/tipc/node.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/016f5995c37a5a2c45198308f830f244517d70b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/055663d21dc4336f67933ab26bef3c5934be6324\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2b66974a1b6134a4bbc3bfed181f7418f688eb54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2de42e268174766cb2e2b90721afdfdff70e0d8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74b45af86a767594ba52330cd440ea84e24d700d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9a51115fcdc78687c8852bf93a1db3951dbb223b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a21ed5064217cc33726da6c7ef1a520eba43aea1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f333b6851bdf326fd2134133272dbbed0c94d921\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
"suse_vex": {
"aggregate_severity": "not set",
"current_release_date": "2026-07-25T15:59:07Z",
"cve": "CVE-2026-64450",
"id": "CVE-2026-64450",
"initial_release_date": "2026-07-25T15:59:07Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64450",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64450.json",
"version": "2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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