CVE-2023-53240
- Source
- https://cve.org/CVERecord?id=CVE-2023-53240
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53240.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2023-53240
- Downstream
- Published
- 2025-09-15T14:22:14.241Z
- Modified
- 2026-01-14T23:40:31.304038Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- xsk: check IFF_UP earlier in Tx path
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
xsk: check IFF_UP earlier in Tx path
Xsk Tx can be triggered via either sendmsg() or poll() syscalls. These two paths share a call to common function xsk_xmit() which has two sanity checks within. A pseudo code example to show the two paths:
_xsksendmsg() : xskpoll(): if (unlikely(!xskisbound(xs))) if (unlikely(!xskisbound(xs))) return -ENXIO; return mask; if (unlikely(needwait)) (...) return -EOPNOTSUPP; xskxmit() mark napi id (...) xskxmit()
xskxmit(): if (unlikely(!(xs->dev->flags & IFFUP))) return -ENETDOWN; if (unlikely(!xs->tx)) return -ENOBUFS;
As it can be observed above, in sendmsg() napi id can be marked on interface that was not brought up and this causes a NULL ptr dereference:
[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018 [31757.512710] #PF: supervisor read access in kernel mode [31757.517936] #PF: errorcode(0x0000) - not-present page [31757.523149] PGD 0 P4D 0 [31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI [31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40 [31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [31757.547457] RIP: 0010:xsksendmsg+0xde/0x180 [31757.551799] Code: 00 75 a2 48 8b 00 a8 04 75 9b 84 d2 74 69 8b 85 14 01 00 00 85 c0 75 1b 48 8b 85 28 03 00 00 48 8b 80 98 00 00 00 48 8b 40 20 <8b> 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f [31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246 [31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000 [31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100 [31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000 [31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa [31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000 [31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000 [31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0 [31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [31757.648139] PKRU: 55555554 [31757.650894] Call Trace: [31757.653385] <TASK> [31757.655524] socksendmsg+0x8f/0xa0 [31757.659077] ? sockfdlookuplight+0x12/0x70 [31757.663416] _syssendto+0xfc/0x170 [31757.667051] ? doschedsetscheduler+0xdb/0x1b0 [31757.671658] _x64syssendto+0x20/0x30 [31757.675557] dosyscall64+0x38/0x90 [31757.679197] entrySYSCALL64afterhwframe+0x72/0xdc [31757.687969] Code: 8e f6 ff 44 8b 4c 24 2c 4c 8b 44 24 20 41 89 c4 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48 [31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c [31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16 [31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000 [31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000 [31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [31757.754940] </TASK>
To fix this, let's make xskxmit a function that will be responsible for generic Tx, where RCU is handled accordingly and pull out sanity checks and xs->zc handling. Populate sanity checks to _xsksendmsg() and xskpoll().
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53240.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b
- https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16
- https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53240.json
- https://nvd.nist.gov/vuln/detail/CVE-2023-53240
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced18b1ab7aa76bde181bdb1ab19a87fa9523c32f21Fixedcecc68559cd57fffb2be50685f262b9af2318e16Fixedffe19750e68d0bb21e8110b398346eef20b156a7Fixed1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast affectedad7219cd8751bd258b9d1e69ae0654ec00f71875Last affectedd1579253ffce39986e7a6ab757ac93b2680a665fLast affected8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9