# CVE-2022-49096: linux: In the Linux kernel, the following vulnerability has been resolved:  net: sfc: add missing xdp queue reinitialization...

CVE-2022-49096 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49096, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49096
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: sfc: add missing xdp queue reinitialization  After rx/tx ring buffer size is changed, kernel panic occurs when it acts XDP_TX or XDP_REDIRECT.  When tx/rx ring buffer size is changed(ethtool -G), sfc driver reallocates and reinitializes rx and tx queues and their buffer (tx_queue->buffer). But it misses reinitializing xdp queues(efx->xdp_tx_queues). So, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized tx_queue->buffer.  A new function efx_set_xdp_channels() is separated from efx_set_channels() to handle only xdp queues.  Splat looks like:    BUG: kernel NULL pointer dereference, address: 000000000000002a    #PF: supervisor write access in kernel mode    #PF: error_code(0x0002) - not-present page    PGD 0 P4D 0    Oops: 0002 [#4] PREEMPT SMP NOPTI    RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]    CPU: 2 PID: 0 Comm: swapper/2 Tainted: G      D           5.17.0+ #55 e8beeee8289528f11357029357cf    Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80    RSP: 0018:ffff92f121e45c60 EFLAGS: 00010297    RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]    RAX: 0000000000000040 RBX: ffff92ea506895c0 RCX: ffffffffc0330870    RDX: 0000000000000001 RSI: 00000001139b10ce RDI: ffff92ea506895c0    RBP: ffffffffc0358a80 R08: 00000001139b110d R09: 0000000000000000    R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040    R13: 0000000000000018 R14: 00000001139b10ce R15: ffff92ea506895c0    FS:  0000000000000000(0000) GS:ffff92f121ec0000(0000) knlGS:0000000000000000    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033    Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80    CR2: 000000000000002a CR3: 00000003e6810004 CR4: 00000000007706e0    RSP: 0018:ffff92f121e85c60 EFLAGS: 00010297    PKRU: 55555554    RAX: 0000000000000040 RBX: ffff92ea50689700 RCX: ffffffffc0330870    RDX: 0000000000000001 RSI: 00000001145a90ce RDI: ffff92ea50689700    RBP: ffffffffc0358a80 R08: 00000001145a910d R09: 0000000000000000    R10: 0000000000000001 R11: ffff92ea414c0088 R12: 0000000000000040    R13: 0000000000000018 R14: 00000001145a90ce R15: ffff92ea50689700    FS:  0000000000000000(0000) GS:ffff92f121e80000(0000) knlGS:0000000000000000    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033    CR2: 000000000000002a CR3: 00000003e6810005 CR4: 00000000007706e0    PKRU: 55555554    Call Trace:     <IRQ>     efx_xdp_tx_buffers+0x12b/0x3d0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]     __efx_rx_packet+0x5c3/0x930 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]     efx_rx_packet+0x28c/0x2e0 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]     efx_ef10_ev_process+0x5f8/0xf40 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]     ? enqueue_task_fair+0x95/0x550     efx_poll+0xc4/0x360 [sfc 84c94b8e32d44d296c17e10a634d3ad454de4ba5]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49096](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49096.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49096](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49096.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49096](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49096.md) | Feb 26, 2025 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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