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CVE-2025-68787netrom: Fix memory leak in nr_sendmsg()

Description

In the Linux kernel, the following vulnerability has been resolved: netrom: Fix memory leak in nr_sendmsg() syzbot reported a memory leak [1]. When function sock_alloc_send_skb() return NULL in nr_output(), the original skb is not freed, which was allocated in nr_sendmsg(). Fix this by freeing it before return. [1] BUG: memory leak unreferenced object 0xffff888129f35500 (size 240): comm "syz.0.17", pid 6119, jiffies 4294944652 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 10 52 28 81 88 ff ff ..........R(.... backtrace (crc 1456a3e4): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4983 [inline] slab_alloc_node mm/slub.c:5288 [inline] kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5340 __alloc_skb+0x203/0x240 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0x69/0x3f0 net/core/skbuff.c:6671 sock_alloc_send_pskb+0x379/0x3e0 net/core/sock.c:2965 sock_alloc_send_skb include/net/sock.h:1859 [inline] nr_sendmsg+0x287/0x450 net/netrom/af_netrom.c:1105 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x293/0x2a0 net/socket.c:1195 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x45d/0x710 fs/read_write.c:686 ksys_write+0x143/0x170 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Timeline

  1. ID reserved

    By Linux

  2. · 20 days later

    Published

  3. · 10 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.23% · top 86% of all CVEs (15 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f77e538ac4e3adb1882d5bccb7bfdc111b5963d3
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 09efbf54eeaecebe882af603c9939a4b1bb9567e
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 73839497bbde5cd4fd02bbd9c8bc2640780ae65d
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 156a0f6341dce634a825db49ca20b48b1ae9bcc1
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8d1ccba4b171cd504ecfa47349cb9864fc9d687c
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977
    • affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 613d12dd794e078be8ff3cf6b62a6b9acf7f4619

  • Linux · Linux

    • affected 2.6.12
    • unaffected < 2.6.12
    • unaffected 5.10.248 – ≤ 5.10.*
    • unaffected 5.15.198 – ≤ 5.15.*
    • unaffected 6.1.160 – ≤ 6.1.*
    • unaffected 6.6.120 – ≤ 6.6.*
    • unaffected 6.12.64 – ≤ 6.12.*
    • unaffected 6.18.3 – ≤ 6.18.*
    • unaffected 6.19 – ≤ *

References

References9

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .