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CVE-2024-26750— af_unix: Drop oob_skb ref before purging queue in GC.

EPSS 0.02% · P4
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I. Basic Information for CVE-2024-26750

Vulnerability Information
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Vulnerability Title
af_unix: Drop oob_skb ref before purging queue in GC.
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: Drop oob_skb ref before purging queue in GC. syzbot reported another task hung in __unix_gc(). [0] The current while loop assumes that all of the left candidates have oob_skb and calling kfree_skb(oob_skb) releases the remaining candidates. However, I missed a case that oob_skb has self-referencing fd and another fd and the latter sk is placed before the former in the candidate list. Then, the while loop never proceeds, resulting the task hung. __unix_gc() has the same loop just before purging the collected skb, so we can call kfree_skb(oob_skb) there and let __skb_queue_purge() release all inflight sockets. [0]: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2784 Comm: kworker/u4:8 Not tainted 6.8.0-rc4-syzkaller-01028-g71b605d32017 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events_unbound __unix_gc RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200 Code: 89 fb e8 23 00 00 00 48 8b 3d 84 f5 1a 0c 48 89 de 5b e9 43 26 57 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 52 70 7e 65 8b 15 91 52 70 RSP: 0018:ffffc9000a17fa78 EFLAGS: 00000287 RAX: ffffffff8a0a6108 RBX: ffff88802b6c2640 RCX: ffff88802c0b3b80 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc9000a17fbf0 R08: ffffffff89383f1d R09: 1ffff1100ee5ff84 R10: dffffc0000000000 R11: ffffed100ee5ff85 R12: 1ffff110056d84ee R13: ffffc9000a17fae0 R14: 0000000000000000 R15: ffffffff8f47b840 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef5687ff8 CR3: 0000000029b34000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> __unix_gc+0xe69/0xf40 net/unix/garbage.c:343 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK>
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于清除队列错误。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 36f7371de977f805750748e80279be7e370df85c ~ 6c480d0f131862645d172ca9e25dc152b1a5c3a6 -
LinuxLinux 5.15.149 ~ 5.15.151 -

II. Public POCs for CVE-2024-26750

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III. Intelligence Information for CVE-2024-26750

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Same Patch Batch · Linux · 2024-04-04 · 32 CVEs total

CVE-2024-26793gtp: fix use-after-free and null-ptr-deref in gtp_newlink()
CVE-2024-26809netfilter: nft_set_pipapo: release elements in clone only from destroy path
CVE-2024-26808netfilter: nft_chain_filter: handle NETDEV_UNREGISTER for inet/ingress basechain
CVE-2024-26807spi: cadence-qspi: fix pointer reference in runtime PM hooks
CVE-2024-26806spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks
CVE-2024-26805netlink: Fix kernel-infoleak-after-free in __skb_datagram_iter
CVE-2024-26804net: ip_tunnel: prevent perpetual headroom growth
CVE-2024-26803net: veth: clear GRO when clearing XDP even when down
CVE-2024-26802stmmac: Clear variable when destroying workqueue
CVE-2024-26800tls: fix use-after-free on failed backlog decryption
CVE-2024-26801Bluetooth: Avoid potential use-after-free in hci_error_reset
CVE-2024-26799ASoC: qcom: Fix uninitialized pointer dmactl
CVE-2024-26798fbcon: always restore the old font data in fbcon_do_set_font()
CVE-2024-26797drm/amd/display: Prevent potential buffer overflow in map_hw_resources
CVE-2024-26796drivers: perf: ctr_get_width function for legacy is not defined
CVE-2024-26795riscv: Sparse-Memory/vmemmap out-of-bounds fix
CVE-2024-26745powerpc/pseries/iommu: IOMMU table is not initialized for kdump over SR-IOV
CVE-2024-26792btrfs: fix double free of anonymous device after snapshot creation failure
CVE-2024-26791btrfs: dev-replace: properly validate device names
CVE-2024-26790dmaengine: fsl-qdma: fix SoC may hang on 16 byte unaligned read

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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