batman-adv: hold claim backbone gateways by reference

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Summary

CVECVE-2026-31657
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:45 UTC
Updated2026-06-01 17:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: CWE-476

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 5202f071b367ffbc8e279fc7a00db14f5e587f52 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 69d1ce9c72eca91203ffdb8d08bacd511100aec6 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 2f55b58b5a0bbed192d60c444a45a49cdf1b545f git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 7962b522222628596ca9ecc8722efc95367aadbd git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 4dee4c0688443aaf5bbec74aa203c851d1d53c35 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 1f2dc36c297d27733f1b380ea644cf15a361bd7b git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 82d8701b2c930d0e96b0dbc9115a218d791cb0d2 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 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 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5202f071b367ffbc8e279fc7a00db14f5e587f52 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4dee4c0688443aaf5bbec74aa203c851d1d53c35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1f2dc36c297d27733f1b380ea644cf15a361bd7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/69d1ce9c72eca91203ffdb8d08bacd511100aec6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7962b522222628596ca9ecc8722efc95367aadbd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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