CVE-2024-26804

一、漏洞信息
 漏洞编号：[CVE-2024-26804](https://nvd.nist.gov/vuln/detail/CVE-2024-26804)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：0.0 None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:net: ip_tunnel: prevent perpetual headroom growthsyzkaller triggered following kasan splat:BUG: KASAN: use-after-free in __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170Read of size 1 at addr ffff88812fb4000e by task syz-executor183/5191[..] kasan_report+0xda/0x110 mm/kasan/report.c:588 __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170 skb_flow_dissect_flow_keys include/linux/skbuff.h:1514 [inline] ___skb_get_hash net/core/flow_dissector.c:1791 [inline] __skb_get_hash+0xc7/0x540 net/core/flow_dissector.c:1856 skb_get_hash include/linux/skbuff.h:1556 [inline] ip_tunnel_xmit+0x1855/0x33c0 net/ipv4/ip_tunnel.c:748 ipip_tunnel_xmit+0x3cc/0x4e0 net/ipv4/ipip.c:308 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564 __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4349 dev_queue_xmit include/linux/netdevice.h:3134 [inline] neigh_connected_output+0x42c/0x5d0 net/core/neighbour.c:1592 ... ip_finish_output2+0x833/0x2550 net/ipv4/ip_output.c:235 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323 .. iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1dbc/0x33c0 net/ipv4/ip_tunnel.c:831 ipgre_xmit+0x4a1/0x980 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564 ...The splat occurs because skb->data points past skb->head allocated area.This is because neigh layer does:  __skb_pull(skb, skb_network_offset(skb));... but skb_network_offset() returns a negative offset and __skb_pull()arg is unsigned.  IOW, we skb->data gets  adjusted  by a huge value.The negative value is returned because skb->head and skb->data distance ismore than 64k and skb->network_header (u16) has wrapped around.The bug is in the ip_tunnel infrastructure, which can causedev->needed_headroom to increment ad infinitum.The syzkaller reproducer consists of packets getting routed via a gretunnel, and route of gre encapsulated packets pointing at another (ipip)tunnel.  The ipip encapsulation finds gre0 as next output device.This results in the following pattern:1). First packet is to be sent out via gre0.Route lookup found an output device, ipip0.2).ip_tunnel_xmit for gre0 bumps gre0->needed_headroom based on the futureoutput device, rt.dev->needed_headroom (ipip0).3).ip output / start_xmit moves skb on to ipip0. which runs the samecode path again (xmit recursion).4).Routing step for the post-gre0-encap packet finds gre0 as output deviceto use for ipip0 encapsulated packet.tunl0->needed_headroom is then incremented based on the (already bumped)gre0 device headroom.This repeats for every future packet:gre0->needed_headroom gets inflated because previous packets  ipip0 stepincremented rt->dev (gre0) headroom, and ipip0 incremented because gre0needed_headroom was increased.For each subsequent packet, gre/ipip0->needed_headroom grows untilpost-expand-head reallocations result in a skb->head/data distance ofmore than 64k.Once that happens, skb->network_header (u16) wraps around whenpskb_expand_head tries to make sure that skb_network_offset() is unchangedafter the headroom expansion/reallocation.After this skb_network_offset(skb) returns a different (and negative)result post headroom expansion.The next trip to neigh layer (or anything else that would __skb_pull thenetwork header) makes skb->data point to a memory location outsideskb->head area.v2: Cap the needed_headroom update to an arbitarily chosen upperlimit toprevent perpetual increase instead of dropping the headroom incrementcompletely.
 漏洞公开时间：2024-04-04 17:15:09
 漏洞创建时间：2024-04-04 10:17:24
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-26804
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/049d7989c67e8dd50f07a2096dbafdb41331fb9b |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2e95350fe9db9d53c701075060ac8ac883b68aee |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/ab63de24ebea36fe73ac7121738595d704b66d96 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/afec0c5cd2ed71ca95a8b36a5e6d03333bf34282 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f81e94d2dcd2397137edcb8b85f4c5bed5d22383 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-26804 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-26804 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/049d7989c67e8dd50f07a2096dbafdb41331fb9b | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/2e95350fe9db9d53c701075060ac8ac883b68aee | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/ab63de24ebea36fe73ac7121738595d704b66d96 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/afec0c5cd2ed71ca95a8b36a5e6d03333bf34282 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/stable/c/f81e94d2dcd2397137edcb8b85f4c5bed5d22383 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-26804.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1222629 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024040404-CVE-2024-26804-a6ff@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:3306 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:3460 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:3461 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:4211 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:4352 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:4447 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| redhat_bugzilla | https://access.redhat.com/errata/RHSA-2024:4740 | https://bugzilla.redhat.com/show_bug.cgi?id=2273423 |
| ubuntu | https://git.kernel.org/stable/c/f81e94d2dcd2397137edcb8b85f4c5bed5d22383 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/2e95350fe9db9d53c701075060ac8ac883b68aee | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/afec0c5cd2ed71ca95a8b36a5e6d03333bf34282 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/ab63de24ebea36fe73ac7121738595d704b66d96 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/a0a1db40b23e8ff86dea2786c5ea1470bb23ecb9 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/049d7989c67e8dd50f07a2096dbafdb41331fb9b | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://git.kernel.org/stable/c/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-26804 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-26804 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-26804 | https://ubuntu.com/security/CVE-2024-26804 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-26804 | https://ubuntu.com/security/CVE-2024-26804 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-26804 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2024-26804 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| linux_kernel | 5.4.271 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f81e94d2dcd2Issue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 5.10.212 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2e95350fe9dbIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 5.15.151 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=afec0c5cd2edIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 6.1.81 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ab63de24ebeaIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 6.6.21 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a0a1db40b23eIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 6.7.9 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=049d7989c67eIssue | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux_kernel | 6.8 | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5ae1e9922bbdPlease | https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=243aad830e8a | linuxkernelcves |
| linux |  | https://git.kernel.org/linus/5ae1e9922bbdbaeb9cfbe91085ab75927488ac0f | https://git.kernel.org/linus/243aad830e8a4cdda261626fbaeddde16b08d04a | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:net: ip_tunnel: prevent perpetual headroom growthsyzkaller triggered following kasan splat:BUG: KASAN: use-after-free in __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170Read of size 1 at addr ffff88812fb4000e by task syz-executor183/5191[..] kasan_report+0xda/0x110 mm/kasan/report.c:588 __skb_flow_dissect+0x19d1/0x7a50 net/core/flow_dissector.c:1170 skb_flow_dissect_flow_keys include/linux/skbuff.h:1514 [inline] ___skb_get_hash net/core/flow_dissector.c:1791 [inline] __skb_get_hash+0xc7/0x540 net/core/flow_dissector.c:1856 skb_get_hash include/linux/skbuff.h:1556 [inline] ip_tunnel_xmit+0x1855/0x33c0 net/ipv4/ip_tunnel.c:748 ipip_tunnel_xmit+0x3cc/0x4e0 net/ipv4/ipip.c:308 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564 __dev_queue_xmit+0x7c1/0x3d60 net/core/dev.c:4349 dev_queue_xmit include/linux/netdevice.h:3134 [inline] neigh_connected_output+0x42c/0x5d0 net/core/neighbour.c:1592 ... ip_finish_output2+0x833/0x2550 net/ipv4/ip_output.c:235 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:323 .. iptunnel_xmit+0x5b4/0x9b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1dbc/0x33c0 net/ipv4/ip_tunnel.c:831 ipgre_xmit+0x4a1/0x980 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3548 [inline] dev_hard_start_xmit+0x13d/0x6d0 net/core/dev.c:3564 ...The splat occurs because skb->data points past skb->head allocated area.This is because neigh layer does:  __skb_pull(skb, skb_network_offset(skb));... but skb_network_offset() returns a negative offset and __skb_pull()arg is unsigned.  IOW, we skb->data gets  adjusted  by a huge value.The negative value is returned because skb->head and skb->data distance ismore than 64k and skb->network_header (u16) has wrapped around.The bug is in the ip_tunnel infrastructure, which can causedev->needed_headroom to increment ad infinitum.The syzkaller reproducer consists of packets getting routed via a gretunnel, and route of gre encapsulated packets pointing at another (ipip)tunnel.  The ipip encapsulation finds gre0 as next output device.This results in the following pattern:1). First packet is to be sent out via gre0.Route lookup found an output device, ipip0.2).ip_tunnel_xmit for gre0 bumps gre0->needed_headroom based on the futureoutput device, rt.dev->needed_headroom (ipip0).3).ip output / start_xmit moves skb on to ipip0. which runs the samecode path again (xmit recursion).4).Routing step for the post-gre0-encap packet finds gre0 as output deviceto use for ipip0 encapsulated packet.tunl0->needed_headroom is then incremented based on the (already bumped)gre0 device headroom.This repeats for every future packet:gre0->needed_headroom gets inflated because previous packets  ipip0 stepincremented rt->dev (gre0) headroom, and ipip0 incremented because gre0needed_headroom was increased.For each subsequent packet, gre/ipip0->needed_headroom grows untilpost-expand-head reallocations result in a skb->head/data distance ofmore than 64k.Once that happens, skb->network_header (u16) wraps around whenpskb_expand_head tries to make sure that skb_network_offset() is unchangedafter the headroom expansion/reallocation.After this skb_network_offset(skb) returns a different (and negative)result post headroom expansion.The next trip to neigh layer (or anything else that would __skb_pull thenetwork header) makes skb->data point to a memory location outsideskb->head area.v2: Cap the needed_headroom update to an arbitarily chosen upperlimit toprevent perpetual increase instead of dropping the headroom incrementcompletely.
 openEuler评分：
  5.3
 Vector：CVSS：3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):不受影响
4.master(6.6.0):不受影响
5.openEuler-24.03-LTS(6.6.0):不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP3(5.10.0):否
3.master(6.6.0):否
4.openEuler-24.03-LTS(6.6.0):否
5.openEuler-24.03-LTS-Next(6.6.0):否
6.openEuler-22.03-LTS-SP4(5.10.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-20.03-LTS-SP4(4.19.90):正常修复
2.openEuler-22.03-LTS-SP3(5.10.0):不修复-超出修复范围
3.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响-漏洞代码不存在
6.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

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