In the Linux kernel, the following vulnerability has been resolved:
erspan: make sure erspan_base_hdr is present in skb->head
syzbot reported a problem in ip6erspan_rcv() [1]
Issue is that ip6erspan_rcv() (and erspan_rcv()) no longer make sure erspan_base_hdr is present in skb linear part (skb->head) before getting @ver field from it.
Add the missing pskb_may_pull() calls.
v2: Reload iph pointer in erspan_rcv() after pskb_may_pull() because skb->head might have changed.
[1]
BUG: KMSAN: uninit-value in pskb_may_pull_reason include/linux/skbuff.h:2742 [inline] BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2756 [inline] BUG: KMSAN: uninit-value in ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline] BUG: KMSAN: uninit-value in gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610 pskb_may_pull_reason include/linux/skbuff.h:2742 [inline] pskb_may_pull include/linux/skbuff.h:2756 [inline] ip6erspan_rcv net/ipv6/ip6_gre.c:541 [inline] gre_rcv+0x11f8/0x1930 net/ipv6/ip6_gre.c:610 ip6_protocol_deliver_rcu+0x1d4c/0x2ca0 net/ipv6/ip6_input.c:438 ip6_input_finish net/ipv6/ip6_input.c:483 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] ip6_input+0x15d/0x430 net/ipv6/ip6_input.c:492 ip6_mc_input+0xa7e/0xc80 net/ipv6/ip6_input.c:586 dst_input include/net/dst.h:460 [inline] ip6_rcv_finish+0x955/0x970 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:314 [inline] ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:310 __netif_receive_skb_one_core net/core/dev.c:5538 [inline] __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5652 netif_receive_skb_internal net/core/dev.c:5738 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5798 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1549 tun_get_user+0x5566/0x69e0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2108 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb63/0x1520 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75
Uninit was created at: slab_post_alloc_hook mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc_node+0x613/0xc50 mm/slub.c:3888 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:577 __alloc_skb+0x35b/0x7a0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1318 [inline] alloc_skb_with_frags+0xc8/0xbf0 net/core/skbuff.c:6504 sock_alloc_send_pskb+0xa81/0xbf0 net/core/sock.c:2795 tun_alloc_skb drivers/net/tun.c:1525 [inline] tun_get_user+0x209a/0x69e0 drivers/net/tun.c:1846 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2108 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb63/0x1520 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75
CPU: 1 PID: 5045 Comm: syz-executor114 Not tainted 6.9.0-rc1-syzkaller-00021-g962490525cff #0
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-docUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-debugUpgrade kernel-zfcpdumpUpgrade kernel-modules-extraUpgrade kernel-debug-modules-extraUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-modulesUpgrade kernel-toolsUpgrade kernel-modulesUpgrade kernel-coreUpgrade kernel-develUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rtUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-develUpgrade perfUpgrade kernel-debug-coreUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-debugUpgrade kernel-zfcpdump-develUpgrade kernel-cross-headersUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernelUpgrade kernel-rt-modules-extraUpgrade kernel-headersUpgrade kernel-rt-kvmUpgrade kernel-debug-develUpgrade kernel-rt-debug-coreUpgrade kernel-rt-coreUpgrade kernel-debug-modulesUpgrade kernel-tools-libsUpgrade kernel-rt-develUpgrade kernel-tools-libs-develUpgrade kernel-rt-debug-kvm | Jul 3, 2024 | May 19, 2024 |
| Amazon Linux Ami 2 | — | Upgrade bpftool-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.15.156-102.160Upgrade perfUpgrade kernel-toolsUpgrade bpftoolUpgrade python-perfUpgrade kernel-livepatch-5.10.215-203.850Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-develUpgrade kernel-headersUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade python-perf-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo | Apr 10, 2025 | May 19, 2024 |
| Amazon_linux_2023 | — | Upgrade perfUpgrade python3-perfUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade perf-debuginfoUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernel-modules-extraUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernel-libbpf-staticUpgrade kernel-livepatch-6.1.87-99.174Upgrade kernelUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-modules-extra-commonUpgrade kernel-libbpf-develUpgrade kernel-tools | Feb 17, 2025 | May 19, 2024 |
| Debian | — | Upgrade linux | Jun 27, 2024 | May 19, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-tools | Oct 8, 2024 | May 19, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-tools-libsUpgrade bpftoolUpgrade kernelUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade python3-perf | Oct 8, 2024 | May 19, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade bpftoolUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel-abi-stablelistsUpgrade kernel | Oct 9, 2024 | May 19, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernelUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perf | Oct 8, 2024 | May 19, 2024 |
| Oracle_linux | — | Upgrade kernel | Jul 3, 2024 | May 19, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernel-rtUpgrade kernel | Jul 3, 2024 | May 19, 2024 |
| Rocky_linux | — | Upgrade kernel-coreUpgrade kernel-debugUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-debug-modulesUpgrade kernel-debug-coreUpgrade kernel-cross-headersUpgrade kernel-rt-modules-extraUpgrade kernel-debug-debuginfoUpgrade kernel-rtUpgrade kernel-develUpgrade kernel-tools-libsUpgrade bpftool-debuginfoUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-rt-debug-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernelUpgrade kernel-rt-kvmUpgrade python3-perf-debuginfoUpgrade kernel-toolsUpgrade kernel-rt-develUpgrade kernel-rt-debug-coreUpgrade kernel-rt-coreUpgrade kernel-modules-extraUpgrade kernel-debuginfoUpgrade kernel-rt-debugUpgrade perfUpgrade kernel-debug-develUpgrade kernel-rt-debuginfoUpgrade python3-perfUpgrade kernel-headersUpgrade perf-debuginfoUpgrade kernel-rt-debug-kvmUpgrade kernel-tools-libs-develUpgrade kernel-rt-modulesUpgrade kernel-rt-debug-modules-extraUpgrade kernel-modulesUpgrade kernel-rt-debug-devel | Jul 16, 2024 | May 19, 2024 |
| Suse | — | Upgrade kernel-rt-extraUpgrade dtb-exynosUpgrade dlm-kmp-64kbUpgrade dtb-amlogicUpgrade kernel-rt-vdsoUpgrade dtb-armUpgrade kernel-source-azureUpgrade kernel-syms-azureUpgrade kernel-devel-azureUpgrade kernel-obs-buildUpgrade kernel-sourceUpgrade cluster-md-kmp-azureUpgrade kernel-rtUpgrade dtb-lgUpgrade dtb-nvidiaUpgrade ocfs2-kmp-rtUpgrade kernel-kvmsmall-develUpgrade kernel-obs-qaUpgrade dtb-apmUpgrade kernel-azure-vdsoUpgrade kernel-azure-develUpgrade kernel-default-extraUpgrade kernel-syms-rtUpgrade reiserfs-kmp-azureUpgrade kernel-rt_debug-vdsoUpgrade dtb-marvellUpgrade dtb-freescaleUpgrade kselftests-kmp-defaultUpgrade dtb-appleUpgrade dlm-kmp-defaultUpgrade kernel-debugUpgrade dtb-mediatekUpgrade cluster-md-kmp-rtUpgrade kernel-devel-rtUpgrade kernel-develUpgrade reiserfs-kmp-defaultUpgrade kernel-rt-livepatchUpgrade kernel-rt-develUpgrade dtb-allwinnerUpgrade dlm-kmp-rtUpgrade gfs2-kmp-azureUpgrade dlm-kmp-azureUpgrade kernel-default-livepatch-develUpgrade kernel-64kb-extraUpgrade kernel-64kb-develUpgrade dtb-sprdUpgrade kernel-defaultUpgrade dtb-amdUpgrade kernel-azure-extraUpgrade dtb-socionextUpgrade dtb-hisiliconUpgrade dtb-amazonUpgrade kernel-symsUpgrade kernel-source-vanillaUpgrade kernel-debug-develUpgrade kernel-default-livepatchUpgrade kernel-default-optionalUpgrade ocfs2-kmp-64kbUpgrade kernel-64kbUpgrade cluster-md-kmp-64kbUpgrade gfs2-kmp-defaultUpgrade ocfs2-kmp-defaultUpgrade ocfs2-kmp-azureUpgrade kselftests-kmp-rtUpgrade dtb-caviumUpgrade kernel-docsUpgrade reiserfs-kmp-rtUpgrade dtb-xilinxUpgrade dtb-broadcomUpgrade kernel-rt_debugUpgrade kernel-docs-htmlUpgrade dtb-renesasUpgrade kernel-default-develUpgrade kernel-default-baseUpgrade kernel-64kb-optionalUpgrade gfs2-kmp-64kbUpgrade kernel-zfcpdumpUpgrade kernel-azureUpgrade kernel-rt_debug-develUpgrade reiserfs-kmp-64kbUpgrade dtb-rockchipUpgrade dtb-alteraUpgrade kernel-debug-vdsoUpgrade kernel-default-base-rebuildUpgrade kernel-rt-optionalUpgrade kernel-kvmsmall-vdsoUpgrade kselftests-kmp-azureUpgrade kernel-kvmsmall | Dec 5, 2025 | Dec 13, 2024 |
| Ubuntu | — | Upgrade linux-image-ibm-classicUpgrade linux-image-5.15.0-1062-kvmUpgrade linux-image-5.4.0-1132-gcpUpgrade linux-image-nvidia-64kUpgrade linux-image-5.15.0-1068-azure-fdeUpgrade linux-image-oemUpgrade linux-image-5.15.0-116-lowlatency-64kUpgrade linux-image-5.15.0-116-lowlatencyUpgrade linux-image-aws-lts-20.04Upgrade linux-image-generic-64kUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-gke-5.15Upgrade linux-image-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-5.4.0-189-generic-lpaeUpgrade linux-image-oem-24.04Upgrade linux-image-gkeop-5.4Upgrade linux-image-aws-lts-22.04Upgrade linux-image-intelUpgrade linux-image-5.15.0-1065-awsUpgrade linux-image-5.15.0-116-genericUpgrade linux-image-6.8.0-1006-gkeUpgrade linux-image-oem-24.04aUpgrade linux-image-oem-20.04dUpgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-intel-iotgUpgrade linux-image-5.15.0-1048-gkeopUpgrade linux-image-azure-lts-20.04Upgrade linux-image-6.8.0-1010-gcpUpgrade linux-image-6.8.0-1008-oemUpgrade linux-image-oem-osp1Upgrade linux-image-5.4.0-189-lowlatencyUpgrade linux-image-azureUpgrade linux-image-5.15.0-1060-intel-iotgUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-generic-lpaeUpgrade linux-image-5.15.0-116-generic-64kUpgrade linux-image-6.8.0-38-generic-64kUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-5.4.0-1127-oracleUpgrade linux-image-oem-20.04bUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-virtual-hwe-20.04Upgrade linux-image-oem-20.04cUpgrade linux-image-5.15.0-116-generic-lpaeUpgrade linux-image-6.8.0-1009-nvidia-64kUpgrade linux-image-gcpUpgrade linux-image-5.15.0-1064-gcpUpgrade linux-image-azure-lts-22.04Upgrade linux-image-genericUpgrade linux-image-gkeUpgrade linux-image-nvidiaUpgrade linux-image-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-gkeopUpgrade linux-image-ibmUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-5.4.0-1116-kvmUpgrade linux-image-generic-hwe-18.04Upgrade linux-image-6.8.0-38-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gkeop-5.15Upgrade linux-image-6.8.0-1007-intelUpgrade linux-image-kvmUpgrade linux-image-5.4.0-1128-awsUpgrade linux-image-5.15.0-1065-gcpUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-oem-20.04Upgrade linux-image-5.15.0-1058-ibmUpgrade linux-image-bluefieldUpgrade linux-image-6.8.0-38-lowlatency-64kUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-6.8.0-1010-azure-fdeUpgrade linux-image-azure-cvmUpgrade linux-image-5.4.0-1095-gkeopUpgrade linux-image-5.4.0-189-genericUpgrade linux-image-6.8.0-1011-awsUpgrade linux-image-5.4.0-1040-iotUpgrade linux-image-awsUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-raspi-nolpaeUpgrade linux-image-oracleUpgrade linux-image-5.15.0-1062-gkeUpgrade linux-image-6.8.0-1008-ibmUpgrade linux-image-5.15.0-1063-oracleUpgrade linux-image-5.4.0-1112-raspiUpgrade linux-image-6.8.0-38-genericUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1007-raspiUpgrade linux-image-5.4.0-1047-xilinx-zynqmpUpgrade linux-image-virtualUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-5.15.0-1060-nvidiaUpgrade linux-image-5.15.0-1035-xilinx-zynqmpUpgrade linux-image-5.4.0-1075-ibmUpgrade linux-image-raspi2Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-virtual-hwe-18.04Upgrade linux-image-5.15.0-1068-azureUpgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-5.15.0-1060-nvidia-lowlatencyUpgrade linux-image-6.8.0-1008-oracleUpgrade linux-image-generic-hwe-20.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1010-azureUpgrade linux-image-5.4.0-1088-bluefieldUpgrade linux-image-5.4.0-1133-azureUpgrade linux-image-6.8.0-1009-nvidiaUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.15.0-1058-raspiUpgrade linux-image-6.8.0-1008-oracle-64kUpgrade linux-image-gcp-lts-20.04 | Jul 12, 2024 | May 19, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 19, 2024 |
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