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CVE-2026-74479— net: pktgen: fix proc entry use-after-free

CVSS 7.8 · High EPSS 0.12% · P3

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux39df232f1a9ba48d41c68ee7d4046756e709cf91< 4ef801b838d85c0ea5852c50667f7344ce3b6cd0affected
39df232f1a9ba48d41c68ee7d4046756e709cf91< b006a5404470bd3eb2aa0425fc447183032047efaffected
39df232f1a9ba48d41c68ee7d4046756e709cf91< 817ff6efdb7f484ea547218e11e17d8e43daa3b4affected
2.6.22affected
< 2.6.22unaffected
6.18.44≤ 6.18.*unaffected
7.1.8≤ 7.1.*unaffected
7.2≤ *unaffected
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I. Basic Information for CVE-2026-74479

Vulnerability Information
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Vulnerability Title
net: pktgen: fix proc entry use-after-free
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: pktgen: fix proc entry use-after-free pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock. pktgen_remove_device() removes the same entry before _rem_dev_from_if_list() takes that lock. This allows the following interleaving: CPU 0 (NETDEV_CHANGENAME) CPU 1 (kpktgend) if_lock(t) proc_remove(pkt_dev->entry) proc_remove(pkt_dev->entry) pkt_dev->entry = proc_create_data(...) if_unlock(t) The kthread can pass the stale proc_dir_entry to proc_remove() after the rename path has freed it. A reproducer with a widened race window reports: BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80 Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67 Call Trace: proc_remove+0x78/0x80 pktgen_remove_device.isra.0+0x11c/0x4c0 pktgen_thread_worker+0x1214/0x6bc0 kthread+0x2c6/0x3b0 Allocated by task 95: __proc_create+0x204/0x790 proc_create_data+0x72/0xe0 pktgen_thread_write+0xd61/0x1510 Freed by task 28: kmem_cache_free+0xcb/0x3d0 proc_free_inode+0x5b/0x80 rcu_core+0x50a/0x1850 The buggy address belongs to the object at ffff8881478fea00 which belongs to the cache proc_dir_entry of size 192 Move proc_remove() into the if_lock-protected list removal helper. Keep it before list_del_rcu() to preserve the ordering required by add_device(). The rename path must then finish replacing the entry before removal, or it observes that the device is no longer on the list.
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基金会开源的一个操作系统内核。 Linux kernel 6.18.44之前版本、7.1.8之前版本和7.2-rc6之前版本存在安全漏洞，该漏洞源于pktgen_change_name()与pktgen_remove_device()之间的竞态条件，导致proc entry释放后重用，可能造成系统崩溃或内存破坏。
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 39df232f1a9ba48d41c68ee7d4046756e709cf91 ~ 4ef801b838d85c0ea5852c50667f7344ce3b6cd0 -
LinuxLinux 2.6.22 -

II. Public POCs for CVE-2026-74479

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III. Intelligence Information for CVE-2026-74479

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Patches & Fixes for CVE-2026-74479 (3)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-7428010.0 CRITICALcrypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-7427910.0 CRITICALcrypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-7242110.0 CRITICALipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-7240810.0 CRITICALgeneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-7240710.0 CRITICALgeneve: validate inner network offset in geneve_gro_complete()
CVE-2026-7447510.0 CRITICALvxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-7430910.0 CRITICALvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-724939.9 CRITICALnet: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-720419.8 CRITICALespintcp: use sk_msg_free_partial to fix partial send
CVE-2026-724779.8 CRITICALfs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-722099.8 CRITICALntfs: validate attribute values on lookup
CVE-2026-722089.8 CRITICALntfs: add bounds check before accessing EA entries
CVE-2026-722069.8 CRITICALntfs: validate index block header more strictly
CVE-2026-722999.8 CRITICALtipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-744349.8 CRITICALrxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-744339.8 CRITICALrxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-724739.8 CRITICALxprtrdma: Decouple req recycling from RPC completion
CVE-2026-724729.8 CRITICALnfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-745459.8 CRITICALrtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-723229.8 CRITICALipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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