# CVE-2023-53109: linux: In the Linux kernel, the following vulnerability has been resolved: net: tunnels: annotate lockless accesses to dev-... CVE-2023-53109 is fixed in 20 products on 1 platform, first by ALAS2023-2023-148, released March 30, 2023. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2023-53109 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Mar 30, 2023 ## Description In the Linux kernel, the following vulnerability has been resolved: net: tunnels: annotate lockless accesses to dev->needed_headroom IP tunnels can apparently update dev->needed_headroom in their xmit path. This patch takes care of three tunnels xmit, and also the core LL_RESERVED_SPACE() and LL_RESERVED_SPACE_EXTRA() helpers. More changes might be needed for completeness. BUG: KCSAN: data-race in ip_tunnel_xmit / ip_tunnel_xmit read to 0xffff88815b9da0ec of 2 bytes by task 888 on cpu 1: ip_tunnel_xmit+0x1270/0x1730 net/ipv4/ip_tunnel.c:803 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/ipv4/ip_output.c:430 dst_output include/net/dst.h:444 [inline] ip_local_out+0x64/0x80 net/ipv4/ip_output.c:126 iptunnel_xmit+0x34a/0x4b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1451/0x1730 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x516/0x570 net/ipv4/ip_gre.c:661 __netdev_start_xmit include/linux/netdevice.h:4881 [inline] netdev_start_xmit include/linux/netdevice.h:4895 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x127/0x400 net/core/dev.c:3596 __dev_queue_xmit+0x1007/0x1eb0 net/core/dev.c:4246 dev_queue_xmit include/linux/netdevice.h:3051 [inline] neigh_direct_output+0x17/0x20 net/core/neighbour.c:1623 neigh_output include/net/neighbour.h:546 [inline] ip_finish_output2+0x740/0x840 net/ipv4/ip_output.c:228 ip_finish_output+0xf4/0x240 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0xe5/0x1b0 net/i ---truncated--- ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-headers amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-livepatch-6.1.21-1.45 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | linux Debian 12.15 (bookworm) | 6.1.25-1 | [DEBIAN-CVE-2023-53109](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53109.md) | May 2, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.1.25-1 | [DEBIAN-CVE-2023-53109](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53109.md) | May 2, 2025 | | Linux | linux Debian 14 | 6.1.25-1 | [DEBIAN-CVE-2023-53109](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53109.md) | May 2, 2025 | | Linux | perf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | python3-perf amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.21-1.45.amzn2023 | [ALAS2023-2023-148](https://patchblox.com/security/data/fix/linux/alas2023-2023-148.md) | Mar 30, 2023 | --- Data as of 2026-11-08T19:12:23Z UTC. 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