CVE-2023-53240 (GCVE-0-2023-53240)
Vulnerability from cvelistv5
Published
2025-09-15 14:22
Modified
2025-09-15 14:22
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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:
__xsk_sendmsg() : xsk_poll():
if (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs)))
return -ENXIO; return mask;
if (unlikely(need_wait)) (...)
return -EOPNOTSUPP; xsk_xmit()
mark napi id
(...)
xsk_xmit()
xsk_xmit():
if (unlikely(!(xs->dev->flags & IFF_UP)))
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: error_code(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:xsk_sendmsg+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] sock_sendmsg+0x8f/0xa0
[31757.659077] ? sockfd_lookup_light+0x12/0x70
[31757.663416] __sys_sendto+0xfc/0x170
[31757.667051] ? do_sched_setscheduler+0xdb/0x1b0
[31757.671658] __x64_sys_sendto+0x20/0x30
[31757.675557] do_syscall_64+0x38/0x90
[31757.679197] entry_SYSCALL_64_after_hwframe+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 xsk_xmit 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 __xsk_sendmsg() and
xsk_poll().
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 Version: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 Version: 18b1ab7aa76bde181bdb1ab19a87fa9523c32f21 Version: ad7219cd8751bd258b9d1e69ae0654ec00f71875 Version: d1579253ffce39986e7a6ab757ac93b2680a665f Version: 8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9 |
||||||
|
|||||||||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/xdp/xsk.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "cecc68559cd57fffb2be50685f262b9af2318e16",
"status": "affected",
"version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21",
"versionType": "git"
},
{
"lessThan": "ffe19750e68d0bb21e8110b398346eef20b156a7",
"status": "affected",
"version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21",
"versionType": "git"
},
{
"lessThan": "1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b",
"status": "affected",
"version": "18b1ab7aa76bde181bdb1ab19a87fa9523c32f21",
"versionType": "git"
},
{
"status": "affected",
"version": "ad7219cd8751bd258b9d1e69ae0654ec00f71875",
"versionType": "git"
},
{
"status": "affected",
"version": "d1579253ffce39986e7a6ab757ac93b2680a665f",
"versionType": "git"
},
{
"status": "affected",
"version": "8a2dea162b92c322f3e42eae0c4a74b8d20aa7a9",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/xdp/xsk.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"lessThan": "5.18",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.16",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.2.*",
"status": "unaffected",
"version": "6.2.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.16",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.2.3",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.3",
"versionStartIncluding": "5.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.15.33",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.16.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.17.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: check IFF_UP earlier in Tx path\n\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\ntwo paths share a call to common function xsk_xmit() which has two\nsanity checks within. A pseudo code example to show the two paths:\n\n__xsk_sendmsg() : xsk_poll():\nif (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs)))\n return -ENXIO; return mask;\nif (unlikely(need_wait)) (...)\n return -EOPNOTSUPP; xsk_xmit()\nmark napi id\n(...)\nxsk_xmit()\n\nxsk_xmit():\nif (unlikely(!(xs-\u003edev-\u003eflags \u0026 IFF_UP)))\n\treturn -ENETDOWN;\nif (unlikely(!xs-\u003etx))\n\treturn -ENOBUFS;\n\nAs it can be observed above, in sendmsg() napi id can be marked on\ninterface that was not brought up and this causes a NULL ptr\ndereference:\n\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\n[31757.512710] #PF: supervisor read access in kernel mode\n[31757.517936] #PF: error_code(0x0000) - not-present page\n[31757.523149] PGD 0 P4D 0\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\n[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 \u003c8b\u003e 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\n[31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\n[31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[31757.648139] PKRU: 55555554\n[31757.650894] Call Trace:\n[31757.653385] \u003cTASK\u003e\n[31757.655524] sock_sendmsg+0x8f/0xa0\n[31757.659077] ? sockfd_lookup_light+0x12/0x70\n[31757.663416] __sys_sendto+0xfc/0x170\n[31757.667051] ? do_sched_setscheduler+0xdb/0x1b0\n[31757.671658] __x64_sys_sendto+0x20/0x30\n[31757.675557] do_syscall_64+0x38/0x90\n[31757.679197] entry_SYSCALL_64_after_hwframe+0x72/0xdc\n[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 \u003c48\u003e 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n[31757.754940] \u003c/TASK\u003e\n\nTo fix this, let\u0027s make xsk_xmit a function that will be responsible for\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\nand xs-\u003ezc handling. Populate sanity checks to __xsk_sendmsg() and\nxsk_poll()."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-15T14:22:14.241Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16"
},
{
"url": "https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7"
},
{
"url": "https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b"
}
],
"title": "xsk: check IFF_UP earlier in Tx path",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-53240",
"datePublished": "2025-09-15T14:22:14.241Z",
"dateReserved": "2025-09-15T14:19:21.848Z",
"dateUpdated": "2025-09-15T14:22:14.241Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2023-53240\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-15T15:15:51.120\",\"lastModified\":\"2025-09-15T15:22:27.090\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: check IFF_UP earlier in Tx path\\n\\nXsk Tx can be triggered via either sendmsg() or poll() syscalls. These\\ntwo paths share a call to common function xsk_xmit() which has two\\nsanity checks within. A pseudo code example to show the two paths:\\n\\n__xsk_sendmsg() : xsk_poll():\\nif (unlikely(!xsk_is_bound(xs))) if (unlikely(!xsk_is_bound(xs)))\\n return -ENXIO; return mask;\\nif (unlikely(need_wait)) (...)\\n return -EOPNOTSUPP; xsk_xmit()\\nmark napi id\\n(...)\\nxsk_xmit()\\n\\nxsk_xmit():\\nif (unlikely(!(xs-\u003edev-\u003eflags \u0026 IFF_UP)))\\n\\treturn -ENETDOWN;\\nif (unlikely(!xs-\u003etx))\\n\\treturn -ENOBUFS;\\n\\nAs it can be observed above, in sendmsg() napi id can be marked on\\ninterface that was not brought up and this causes a NULL ptr\\ndereference:\\n\\n[31757.505631] BUG: kernel NULL pointer dereference, address: 0000000000000018\\n[31757.512710] #PF: supervisor read access in kernel mode\\n[31757.517936] #PF: error_code(0x0000) - not-present page\\n[31757.523149] PGD 0 P4D 0\\n[31757.525726] Oops: 0000 [#1] PREEMPT SMP NOPTI\\n[31757.530154] CPU: 26 PID: 95641 Comm: xdpsock Not tainted 6.2.0-rc5+ #40\\n[31757.536871] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\\n[31757.547457] RIP: 0010:xsk_sendmsg+0xde/0x180\\n[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 \u003c8b\u003e 40 18 89 85 14 01 00 00 8b bd 14 01 00 00 81 ff 00 01 00 00 0f\\n[31757.570840] RSP: 0018:ffffc90034f27dc0 EFLAGS: 00010246\\n[31757.576143] RAX: 0000000000000000 RBX: ffffc90034f27e18 RCX: 0000000000000000\\n[31757.583389] RDX: 0000000000000001 RSI: ffffc90034f27e18 RDI: ffff88984cf3c100\\n[31757.590631] RBP: ffff88984714a800 R08: ffff88984714a800 R09: 0000000000000000\\n[31757.597877] R10: 0000000000000001 R11: 0000000000000000 R12: 00000000fffffffa\\n[31757.605123] R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000000\\n[31757.612364] FS: 00007fb4c5931180(0000) GS:ffff88afdfa00000(0000) knlGS:0000000000000000\\n[31757.620571] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[31757.626406] CR2: 0000000000000018 CR3: 000000184b41c003 CR4: 00000000007706e0\\n[31757.633648] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n[31757.640894] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n[31757.648139] PKRU: 55555554\\n[31757.650894] Call Trace:\\n[31757.653385] \u003cTASK\u003e\\n[31757.655524] sock_sendmsg+0x8f/0xa0\\n[31757.659077] ? sockfd_lookup_light+0x12/0x70\\n[31757.663416] __sys_sendto+0xfc/0x170\\n[31757.667051] ? do_sched_setscheduler+0xdb/0x1b0\\n[31757.671658] __x64_sys_sendto+0x20/0x30\\n[31757.675557] do_syscall_64+0x38/0x90\\n[31757.679197] entry_SYSCALL_64_after_hwframe+0x72/0xdc\\n[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 \u003c48\u003e 3d 00 f0 ff ff 77 3a 44 89 e7 48 89 44 24 08 e8 b5 8e f6 ff 48\\n[31757.707007] RSP: 002b:00007ffd49c73c70 EFLAGS: 00000293 ORIG_RAX: 000000000000002c\\n[31757.714694] RAX: ffffffffffffffda RBX: 000055a996565380 RCX: 00007fb4c5727c16\\n[31757.721939] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\\n[31757.729184] RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000\\n[31757.736429] R10: 0000000000000040 R11: 0000000000000293 R12: 0000000000000000\\n[31757.743673] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\\n[31757.754940] \u003c/TASK\u003e\\n\\nTo fix this, let\u0027s make xsk_xmit a function that will be responsible for\\ngeneric Tx, where RCU is handled accordingly and pull out sanity checks\\nand xs-\u003ezc handling. Populate sanity checks to __xsk_sendmsg() and\\nxsk_poll().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1596dae2f17ec5c6e8c8f0e3fec78c5ae55c1e0b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cecc68559cd57fffb2be50685f262b9af2318e16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ffe19750e68d0bb21e8110b398346eef20b156a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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