# CVE-2024-43897: linux: In the Linux kernel, the following vulnerability has been resolved:  net: drop bad gso csum_start and offset in virti...

CVE-2024-43897 is fixed in 56 products on 1 platform, first by DEBIAN-CVE-2024-43897, released August 26, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-43897
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 26, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: drop bad gso csum_start and offset in virtio_net_hdr  Tighten csum_start and csum_offset checks in virtio_net_hdr_to_skb for GSO packets.  The function already checks that a checksum requested with VIRTIO_NET_HDR_F_NEEDS_CSUM is in skb linear. But for GSO packets this might not hold for segs after segmentation.  Syzkaller demonstrated to reach this warning in skb_checksum_help  	offset = skb_checksum_start_offset(skb); 	ret = -EINVAL; 	if (WARN_ON_ONCE(offset >= skb_headlen(skb)))  By injecting a TSO packet:  WARNING: CPU: 1 PID: 3539 at net/core/dev.c:3284 skb_checksum_help+0x3d0/0x5b0  ip_do_fragment+0x209/0x1b20 net/ipv4/ip_output.c:774  ip_finish_output_gso net/ipv4/ip_output.c:279 [inline]  __ip_finish_output+0x2bd/0x4b0 net/ipv4/ip_output.c:301  iptunnel_xmit+0x50c/0x930 net/ipv4/ip_tunnel_core.c:82  ip_tunnel_xmit+0x2296/0x2c70 net/ipv4/ip_tunnel.c:813  __gre_xmit net/ipv4/ip_gre.c:469 [inline]  ipgre_xmit+0x759/0xa60 net/ipv4/ip_gre.c:661  __netdev_start_xmit include/linux/netdevice.h:4850 [inline]  netdev_start_xmit include/linux/netdevice.h:4864 [inline]  xmit_one net/core/dev.c:3595 [inline]  dev_hard_start_xmit+0x261/0x8c0 net/core/dev.c:3611  __dev_queue_xmit+0x1b97/0x3c90 net/core/dev.c:4261  packet_snd net/packet/af_packet.c:3073 [inline]  The geometry of the bad input packet at tcp_gso_segment:  [   52.003050][ T8403] skb len=12202 headroom=244 headlen=12093 tailroom=0 [   52.003050][ T8403] mac=(168,24) mac_len=24 net=(192,52) trans=244 [   52.003050][ T8403] shinfo(txflags=0 nr_frags=1 gso(size=1552 type=3 segs=0)) [   52.003050][ T8403] csum(0x60000c7 start=199 offset=1536 ip_summed=3 complete_sw=0 valid=0 level=0)  Mitigate with stricter input validation.  csum_offset: for GSO packets, deduce the correct value from gso_type. This is already done for USO. Extend it to TSO. Let UFO be: udp[46]_ufo_fragment ignores these fields and always computes the checksum in software.  csum_start: finding the real offset requires parsing to the transport header. Do not add a parser, use existing segmentation parsing. Thanks to SKB_GSO_DODGY, that also catches bad packets that are hw offloaded. Again test both TSO and USO. Do not test UFO for the above reason, and do not test UDP tunnel offload.  GSO packet are almost always CHECKSUM_PARTIAL. USO packets may be CHECKSUM_NONE since commit 10154dbded6d6 ("udp: Allow GSO transmit from devices with no checksum offload"), but then still these fields are initialized correctly in udp4_hwcsum/udp6_hwcsum_outgoing. So no need to test for ip_summed == CHECKSUM_PARTIAL first.  This revises an existing fix mentioned in the Fixes tag, which broke small packets with GSO offload, as detected by kselftests.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | bpftool ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | bpftool ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | bpftool-debuginfo amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | dtb-aarch64 opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-64kb opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-64kb sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-azure opensuse-leap 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-azure sles 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-debug opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-debuginfo amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-default opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-default sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-default-base opensuse-leap 15.6 | 6.4.0-150600.23.22.1.150600.12.8.3 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-default-base sles 15.6 | 6.4.0-150600.23.22.1.150600.12.8.3 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-devel amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-docs opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-docs sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-headers amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-kvmsmall opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-libbpf amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-libbpf-devel amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-libbpf-static amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-livepatch-6.1.109-118.189 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-livepatch-SLE15-SP6-RT_Update_2 sles 15.6 | 1-150600.1.3.2 | [SUSE-SU-2024:3195-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3195-1.md) | Sep 10, 2024 |
| Linux | kernel-livepatch-SLE15-SP6_Update_4 sles 15.6 | 1-150600.13.3.3 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-modules-extra amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-modules-extra-common amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-obs-build opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-obs-build sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-obs-qa opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-rt opensuse-leap 15.6 | 6.4.0-150600.10.8.3 | [SUSE-SU-2024:3195-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3195-1.md) | Sep 10, 2024 |
| Linux | kernel-rt_debug opensuse-leap 15.6 | 6.4.0-150600.10.8.3 | [SUSE-SU-2024:3195-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3195-1.md) | Sep 10, 2024 |
| Linux | kernel-source opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-source sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-source-azure opensuse-leap 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-source-azure sles 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-source-rt opensuse-leap 15.6 | 6.4.0-150600.10.8.3 | [SUSE-SU-2024:3195-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3195-1.md) | Sep 10, 2024 |
| Linux | kernel-syms opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-syms sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-syms-azure opensuse-leap 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-syms-azure sles 15.6 | 6.4.0-150600.8.11.1 | [SUSE-SU-2024:3194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3194-1.md) | Sep 10, 2024 |
| Linux | kernel-syms-rt opensuse-leap 15.6 | 6.4.0-150600.10.8.1 | [SUSE-SU-2024:3195-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3195-1.md) | Sep 10, 2024 |
| Linux | kernel-tools amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-tools-debuginfo amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-tools-devel amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | kernel-uek ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-container ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-container ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-core ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-core ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-devel ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-devel ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-doc ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-doc ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-modules ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-modules ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-302.167.6.el9uek | [ELSA-2024-12815](https://patchblox.com/security/data/fix/linux/elsa-2024-12815.md) | Nov 11, 2024 |
| Linux | kernel-zfcpdump opensuse-leap 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | kernel-zfcpdump sles 15.6 | 6.4.0-150600.23.22.1 | [SUSE-SU-2024:3383-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-3383-1.md) | Sep 23, 2024 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.106-3 | [DEBIAN-CVE-2024-43897](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43897.md) | Aug 26, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.10.6-1 | [DEBIAN-CVE-2024-43897](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43897.md) | Aug 26, 2024 |
| Linux | linux Debian 14 | 6.10.6-1 | [DEBIAN-CVE-2024-43897](https://patchblox.com/security/data/fix/linux/debian-cve-2024-43897.md) | Aug 26, 2024 |
| Linux | perf amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | perf-debuginfo amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | python3-perf amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |
| Linux | python3-perf-debuginfo amzn 2023 | 6.1.109-118.189.amzn2023 | [ALAS2023-2024-779](https://patchblox.com/security/data/fix/linux/alas2023-2024-779.md) | Dec 5, 2024 |

---

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