CVE-2026-64550

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

State: Published
Severity: 7.3 High
Published: Jul 27, 2026
Updated: Aug 17, 2026
Reserved: Jul 19, 2026

Description

In 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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ceed73a2cf4aff2921802aa3d21d45280677547d to before ed25befc8c36f896b5878f9078faddb67fd7e2d0Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before a54d76d176e50d2fdbd39b7231efe256170339e4Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before 00f4c366dbca16a40772c3b7ec2d8cba839e9724Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before 3868c3244369ab709a90c9aad7534d406009b824Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before 14eb0c9491385d5361a292ea4974aec0e6887299Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before 1b12612c367e4be9b0814c0468e7e687835315b4Affected ceed73a2cf4aff2921802aa3d21d45280677547d to before 231a8a4b76cb1b1827b3b19d7b3603642f5aaaefAffected ceed73a2cf4aff2921802aa3d21d45280677547d to before f0f1887a9e30712a1df03e152dce6fb91344b1f3Affected
LinuxLinux	4.14Affected before 4.14Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

ceed73a2cf4aff2921802aa3d21d45280677547d to before ed25befc8c36f896b5878f9078faddb67fd7e2d0Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before a54d76d176e50d2fdbd39b7231efe256170339e4Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before 00f4c366dbca16a40772c3b7ec2d8cba839e9724Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before 3868c3244369ab709a90c9aad7534d406009b824Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before 14eb0c9491385d5361a292ea4974aec0e6887299Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before 1b12612c367e4be9b0814c0468e7e687835315b4Affected
ceed73a2cf4aff2921802aa3d21d45280677547d to before 231a8a4b76cb1b1827b3b19d7b3603642f5aaaefAffected
ceed73a2cf4aff2921802aa3d21d45280677547d to before f0f1887a9e30712a1df03e152dce6fb91344b1f3Affected

LinuxLinux

4.14Affected
before 4.14Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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