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CVE-2024-26631— ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于idev->mc_ifc_count允许在没有适当锁定的情况下被重写。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 07a7a183f22cf1e3ce5ed336fe62a6248a2f6738< 75ddcd741d2a30696f5893bc71a9d28f4ef22311 affected
2d9a93b4902be6a5504b5941dd15e9cd776aadca< 62b3387beef11738eb6ce667601a28fa089fa02c affected
2d9a93b4902be6a5504b5941dd15e9cd776aadca< 380540bb06bb1d1b12bdc947d1b8f56cda6b5663 affected
2d9a93b4902be6a5504b5941dd15e9cd776aadca< 3cc283fd16fba72e2cefe3a6f48d7a36b0438900 affected
2d9a93b4902be6a5504b5941dd15e9cd776aadca< 3bb5849675ae1d592929798a2b37ea450879c855 affected
2d9a93b4902be6a5504b5941dd15e9cd776aadca< 2e7ef287f07c74985f1bf2858bedc62bd9ebf155 affected
5.13 affected
< 5.13 unaffected
… +5 more rows
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I. Basic Information for CVE-2024-26631

Vulnerability Information
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Vulnerability Title
ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix data-race in ipv6_mc_down / mld_ifc_work idev->mc_ifc_count can be written over without proper locking. Originally found by syzbot [1], fix this issue by encapsulating calls to mld_ifc_stop_work() (and mld_gq_stop_work() for good measure) with mutex_lock() and mutex_unlock() accordingly as these functions should only be called with mc_lock per their declarations. [1] BUG: KCSAN: data-race in ipv6_mc_down / mld_ifc_work write to 0xffff88813a80c832 of 1 bytes by task 3771 on cpu 0: mld_ifc_stop_work net/ipv6/mcast.c:1080 [inline] ipv6_mc_down+0x10a/0x280 net/ipv6/mcast.c:2725 addrconf_ifdown+0xe32/0xf10 net/ipv6/addrconf.c:3949 addrconf_notify+0x310/0x980 notifier_call_chain kernel/notifier.c:93 [inline] raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461 __dev_notify_flags+0x205/0x3d0 dev_change_flags+0xab/0xd0 net/core/dev.c:8685 do_setlink+0x9f6/0x2430 net/core/rtnetlink.c:2916 rtnl_group_changelink net/core/rtnetlink.c:3458 [inline] __rtnl_newlink net/core/rtnetlink.c:3717 [inline] rtnl_newlink+0xbb3/0x1670 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910 ... write to 0xffff88813a80c832 of 1 bytes by task 22 on cpu 1: mld_ifc_work+0x54c/0x7b0 net/ipv6/mcast.c:2653 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700 worker_thread+0x525/0x730 kernel/workqueue.c:2781 ...
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于idev->mc_ifc_count允许在没有适当锁定的情况下被重写。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 07a7a183f22cf1e3ce5ed336fe62a6248a2f6738 ~ 75ddcd741d2a30696f5893bc71a9d28f4ef22311 -
Linux Linux 5.13 -

II. Public POCs for CVE-2024-26631

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III. Intelligence Information for CVE-2024-26631

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Patches & Fixes for CVE-2024-26631 (1)

Other References for CVE-2024-26631 (5)

Same Patch Batch · Linux · 2024-03-18 · 21 CVEs total

CVE-2024-26641 8.6 HIGH ip6_tunnel: make sure to pull inner header in __ip6_tnl_rcv()
CVE-2024-26640 7.8 HIGH tcp: add sanity checks to rx zerocopy
CVE-2023-52612 7.8 HIGH crypto: scomp - fix req->dst buffer overflow
CVE-2024-26637 7.8 HIGH wifi: ath11k: rely on mac80211 debugfs handling for vif
CVE-2024-26632 7.8 HIGH block: Fix iterating over an empty bio with bio_for_each_folio_all
CVE-2023-52616 7.8 HIGH crypto: lib/mpi - Fix unexpected pointer access in mpi_ec_init
CVE-2023-52614 7.8 HIGH PM / devfreq: Fix buffer overflow in trans_stat_show
CVE-2023-52610 7.5 HIGH net/sched: act_ct: fix skb leak and crash on ooo frags
CVE-2023-52615 hwrng: core - Fix page fault dead lock on mmap-ed hwrng
CVE-2024-26633 ip6_tunnel: fix NEXTHDR_FRAGMENT handling in ip6_tnl_parse_tlv_enc_lim()
CVE-2024-26634 net: fix removing a namespace with conflicting altnames
CVE-2024-26635 llc: Drop support for ETH_P_TR_802_2.
CVE-2023-52613 drivers/thermal/loongson2_thermal: Fix incorrect PTR_ERR() judgment
CVE-2024-26636 llc: make llc_ui_sendmsg() more robust against bonding changes
CVE-2024-26638 nbd: always initialize struct msghdr completely
CVE-2023-52617 PCI: switchtec: Fix stdev_release() crash after surprise hot remove
CVE-2023-52618 block/rnbd-srv: Check for unlikely string overflow
CVE-2023-52619 pstore/ram: Fix crash when setting number of cpus to an odd number
CVE-2023-52611 wifi: rtw88: sdio: Honor the host max_req_size in the RX path
CVE-2023-52609 binder: fix race between mmput() and do_exit()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-26631

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