batman-adv: tt: fix negative tt_buff_len

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Summary

CVECVE-2026-64088
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:49 UTC
Updated2026-07-20 15:17:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative tt_buff_len batadv_orig_node::tt_buff_len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer. In batadv_send_other_tt_response(), tt_buff_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized. Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_other_tt_response().

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: 0.001840000 probability, percentile 0.082490000 (date 2026-07-20)

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 a73105b8d4c765d9ebfb664d0a66802127d8e4c7 4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 3c96dff00998314983b68a3e7caac07a66ebe496 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 32edd2a28e112064020a2f319a8cb8a9e5a09767 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 4dab98961426d0cf6a1599cda6950b7596ca2fcd git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 730de8733dd90f70d7580a9b329b971f8e1474a2 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 ed28ead3420c373a7928622f114bc6168075d1e1 git Not specified
CNA Linux Linux affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 b64963a2ceeb7529310b6cf253a1e540784422f4 git Not specified
CNA Linux Linux affected 3.1 Not specified
CNA Linux Linux unaffected 3.1 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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