# CVE-2022-49803: netdevsim: Fix memory leak of nsim_dev->fa_cookie

CVE-2022-49803 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49803, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49803
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025
- Weakness: Missing Release of Memory after Effective Lifetime
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-49803

## Description

In the Linux kernel, the following vulnerability has been resolved:  netdevsim: Fix memory leak of nsim_dev->fa_cookie  kmemleak reports this issue:  unreferenced object 0xffff8881bac872d0 (size 8):   comm "sh", pid 58603, jiffies 4481524462 (age 68.065s)   hex dump (first 8 bytes):     04 00 00 00 de ad be ef                          ........   backtrace:     [<00000000c80b8577>] __kmalloc+0x49/0x150     [<000000005292b8c6>] nsim_dev_trap_fa_cookie_write+0xc1/0x210 [netdevsim]     [<0000000093d78e77>] full_proxy_write+0xf3/0x180     [<000000005a662c16>] vfs_write+0x1c5/0xaf0     [<000000007aabf84a>] ksys_write+0xed/0x1c0     [<000000005f1d2e47>] do_syscall_64+0x3b/0x90     [<000000006001c6ec>] entry_SYSCALL_64_after_hwframe+0x63/0xcd  The issue occurs in the following scenarios:  nsim_dev_trap_fa_cookie_write()   kmalloc() fa_cookie   nsim_dev->fa_cookie = fa_cookie .. nsim_drv_remove()  The fa_cookie allocked in nsim_dev_trap_fa_cookie_write() is not freed. To fix, add kfree(nsim_dev->fa_cookie) to nsim_drv_remove().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49803](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49803.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49803](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49803.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49803](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49803.md) | May 1, 2025 |

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