{"id":"DEBIAN-CVE-2022-49096","details":"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-\u003ebuffer). But it misses reinitializing xdp queues(efx-\u003exdp_tx_queues). So, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized tx_queue-\u003ebuffer.  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:     \u003cIRQ\u003e     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]","modified":"2026-09-01T16:05:30.261552760Z","published":"2025-02-26T07:00:47.010Z","upstream":["CVE-2022-49096"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49096"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49096.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49096.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.17.3-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49096.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}