# CVE-2022-49871: linux: In the Linux kernel, the following vulnerability has been resolved:  net: tun: Fix memory leaks of napi_get_frags  km...

CVE-2022-49871 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49871, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49871
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: tun: Fix memory leaks of napi_get_frags  kmemleak reports after running test_progs:  unreferenced object 0xffff8881b1672dc0 (size 232):   comm "test_progs", pid 394388, jiffies 4354712116 (age 841.975s)   hex dump (first 32 bytes):     e0 84 d7 a8 81 88 ff ff 80 2c 67 b1 81 88 ff ff  .........,g.....     00 40 c5 9b 81 88 ff ff 00 00 00 00 00 00 00 00  .@..............   backtrace:     [<00000000c8f01748>] napi_skb_cache_get+0xd4/0x150     [<0000000041c7fc09>] __napi_build_skb+0x15/0x50     [<00000000431c7079>] __napi_alloc_skb+0x26e/0x540     [<000000003ecfa30e>] napi_get_frags+0x59/0x140     [<0000000099b2199e>] tun_get_user+0x183d/0x3bb0 [tun]     [<000000008a5adef0>] tun_chr_write_iter+0xc0/0x1b1 [tun]     [<0000000049993ff4>] do_iter_readv_writev+0x19f/0x320     [<000000008f338ea2>] do_iter_write+0x135/0x630     [<000000008a3377a4>] vfs_writev+0x12e/0x440     [<00000000a6b5639a>] do_writev+0x104/0x280     [<00000000ccf065d8>] do_syscall_64+0x3b/0x90     [<00000000d776e329>] entry_SYSCALL_64_after_hwframe+0x63/0xcd  The issue occurs in the following scenarios: tun_get_user()   napi_gro_frags()     napi_frags_finish()       case GRO_NORMAL:         gro_normal_one()           list_add_tail(&skb->list, &napi->rx_list);           <-- While napi->rx_count < READ_ONCE(gro_normal_batch),           <-- gro_normal_list() is not called, napi->rx_list is not empty   <-- not ask to complete the gro work, will cause memory leaks in   <-- following tun_napi_del() ... tun_napi_del()   netif_napi_del()     __netif_napi_del()     <-- &napi->rx_list is not empty, which caused memory leaks  To fix, add napi_complete() after napi_gro_frags().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49871](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49871.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49871](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49871.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49871](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49871.md) | May 1, 2025 |

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