net: qualcomm: rmnet: validate MAP frame length before ingress parsing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64550
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 21:17:07 UTC
Updated2026-08-17 05:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: validate MAP frame length before ingress parsing When ingress deaggregation is disabled, rmnet_map_ingress_handler() passes the skb straight to __rmnet_map_ingress_handler(), skipping the length validation that rmnet_map_deaggregate() performs on the aggregated path. The parser then dereferences the MAP header and csum header/trailer based on the on-wire pkt_len without checking skb->len, so a short frame is read out of bounds: BUG: KASAN: slab-out-of-bounds in rmnet_map_checksum_downlink_packet Read of size 1 at addr ffff88801118ed00 by task exploit/147 Call Trace: ... rmnet_map_checksum_downlink_packet (drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c:413) __rmnet_map_ingress_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:96) rmnet_rx_handler (drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c:129) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6089) netif_receive_skb (net/core/dev.c:6460) tun_get_user (drivers/net/tun.c:1955) tun_chr_write_iter (drivers/net/tun.c:2001) vfs_write (fs/read_write.c:688) ksys_write (fs/read_write.c:740) do_syscall_64 (arch/x86/entry/syscall_64.c:94) ... Factor that validation out of rmnet_map_deaggregate() into rmnet_map_validate_packet_len() and run it on the no-aggregation path too. The MAP header is bounds-checked first, since this path can receive a frame shorter than the header.

Risk And Classification

Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001260000 probability, percentile 0.026560000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
3.1CNADECLARED7.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d ed25befc8c36f896b5878f9078faddb67fd7e2d0 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d a54d76d176e50d2fdbd39b7231efe256170339e4 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d 00f4c366dbca16a40772c3b7ec2d8cba839e9724 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d 3868c3244369ab709a90c9aad7534d406009b824 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d 14eb0c9491385d5361a292ea4974aec0e6887299 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d 1b12612c367e4be9b0814c0468e7e687835315b4 git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d 231a8a4b76cb1b1827b3b19d7b3603642f5aaaef git Not specified
CNA Linux Linux affected ceed73a2cf4aff2921802aa3d21d45280677547d f0f1887a9e30712a1df03e152dce6fb91344b1f3 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* 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/a54d76d176e50d2fdbd39b7231efe256170339e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1b12612c367e4be9b0814c0468e7e687835315b4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ed25befc8c36f896b5878f9078faddb67fd7e2d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00f4c366dbca16a40772c3b7ec2d8cba839e9724 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/14eb0c9491385d5361a292ea4974aec0e6887299 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/231a8a4b76cb1b1827b3b19d7b3603642f5aaaef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3868c3244369ab709a90c9aad7534d406009b824 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0f1887a9e30712a1df03e152dce6fb91344b1f3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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