Bugzilla – Bug 1225834
VUL-0: CVE-2024-36937: kernel: xdp: use flags field to disambiguate broadcast redirect
Last modified: 2024-07-10 20:30:24 UTC
In the Linux kernel, the following vulnerability has been resolved: xdp: use flags field to disambiguate broadcast redirect When redirecting a packet using XDP, the bpf_redirect_map() helper will set up the redirect destination information in struct bpf_redirect_info (using the __bpf_xdp_redirect_map() helper function), and the xdp_do_redirect() function will read this information after the XDP program returns and pass the frame on to the right redirect destination. When using the BPF_F_BROADCAST flag to do multicast redirect to a whole map, __bpf_xdp_redirect_map() sets the 'map' pointer in struct bpf_redirect_info to point to the destination map to be broadcast. And xdp_do_redirect() reacts to the value of this map pointer to decide whether it's dealing with a broadcast or a single-value redirect. However, if the destination map is being destroyed before xdp_do_redirect() is called, the map pointer will be cleared out (by bpf_clear_redirect_map()) without waiting for any XDP programs to stop running. This causes xdp_do_redirect() to think that the redirect was to a single target, but the target pointer is also NULL (since broadcast redirects don't have a single target), so this causes a crash when a NULL pointer is passed to dev_map_enqueue(). To fix this, change xdp_do_redirect() to react directly to the presence of the BPF_F_BROADCAST flag in the 'flags' value in struct bpf_redirect_info to disambiguate between a single-target and a broadcast redirect. And only read the 'map' pointer if the broadcast flag is set, aborting if that has been cleared out in the meantime. This prevents the crash, while keeping the atomic (cmpxchg-based) clearing of the map pointer itself, and without adding any more checks in the non-broadcast fast path. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36937 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36937.mbox https://git.kernel.org/stable/c/12481f30128fbebc2eeb55eb2d56390fdfa30c5e https://git.kernel.org/stable/c/272bfb019f3cc018f654b992115774e77b4f3ffc https://git.kernel.org/stable/c/e22e25820fa04ea5eaac4ef7ee200e9923f466a4 https://git.kernel.org/stable/c/6fd81f9d333e7b3532036577b1beb74ba1323553 https://git.kernel.org/stable/c/5bcf0dcbf9066348058b88a510c57f70f384c92c https://www.cve.org/CVERecord?id=CVE-2024-36937
Fixing commit 5bcf0dcbf906 "xdp: use flags field to disambiguate broadcast redirect" merged v6.9 backported to the following affected branches with buggy commit e624d4ed4aa8 "xdp: Extend xdp_redirect_map with broadcast support" merged v5.14: - SLE15-SP6 - SLE15-SP5 Reassigning back to security team.
SUSE-SU-2024:2372-1: An update that solves 249 vulnerabilities, contains three features and has 45 security fixes can now be installed. Category: security (important) Bug References: 1156395, 1190336, 1191958, 1193883, 1194826, 1195065, 1195254, 1195341, 1195349, 1195775, 1196746, 1197915, 1198014, 1199295, 1202767, 1202780, 1205205, 1207361, 1217912, 1218148, 1218570, 1218820, 1219224, 1219633, 1219847, 1220368, 1220812, 1220958, 1221086, 1221282, 1221958, 1222015, 1222072, 1222080, 1222241, 1222254, 1222364, 1222893, 1223013, 1223018, 1223265, 1223384, 1223641, 1224020, 1224331, 1224488, 1224497, 1224498, 1224504, 1224520, 1224539, 1224540, 1224552, 1224583, 1224588, 1224602, 1224603, 1224605, 1224612, 1224614, 1224619, 1224661, 1224662, 1224670, 1224671, 1224674, 1224677, 1224679, 1224696, 1224703, 1224712, 1224716, 1224719, 1224735, 1224749, 1224764, 1224765, 1224766, 1224935, 1224946, 1224951, 1225050, 1225098, 1225105, 1225300, 1225389, 1225391, 1225419, 1225426, 1225448, 1225452, 1225467, 1225475, 1225484, 1225487, 1225514, 1225518, 1225535, 1225585, 1225602, 1225611, 1225681, 1225692, 1225698, 1225699, 1225704, 1225714, 1225726, 1225732, 1225737, 1225749, 1225758, 1225759, 1225760, 1225767, 1225770, 1225823, 1225834, 1225840, 1225866, 1225872, 1225894, 1225945, 1226022, 1226131, 1226145, 1226149, 1226155, 1226211, 1226212, 1226226, 1226514, 1226520, 1226537, 1226538, 1226539, 1226550, 1226552, 1226553, 1226554, 1226556, 1226557, 1226558, 1226559, 1226561, 1226562, 1226563, 1226564, 1226566, 1226567, 1226569, 1226572, 1226575, 1226576, 1226577, 1226579, 1226580, 1226581, 1226582, 1226583, 1226585, 1226587, 1226588, 1226593, 1226595, 1226597, 1226601, 1226602, 1226603, 1226607, 1226610, 1226614, 1226616, 1226617, 1226618, 1226619, 1226621, 1226622, 1226624, 1226626, 1226628, 1226629, 1226632, 1226633, 1226634, 1226637, 1226643, 1226644, 1226645, 1226647, 1226650, 1226653, 1226657, 1226658, 1226669, 1226670, 1226672, 1226673, 1226674, 1226675, 1226678, 1226679, 1226683, 1226685, 1226686, 1226690, 1226691, 1226692, 1226693, 1226696, 1226697, 1226698, 1226699, 1226701, 1226702, 1226703, 1226704, 1226705, 1226706, 1226708, 1226709, 1226710, 1226711, 1226712, 1226713, 1226715, 1226716, 1226718, 1226719, 1226720, 1226721, 1226730, 1226732, 1226734, 1226735, 1226737, 1226738, 1226739, 1226740, 1226744, 1226746, 1226747, 1226749, 1226754, 1226762, 1226764, 1226767, 1226768, 1226769, 1226771, 1226774, 1226777, 1226780, 1226781, 1226785, 1226786, 1226789, 1226791, 1226839, 1226840, 1226841, 1226842, 1226848, 1226852, 1226857, 1226861, 1226863, 1226864, 1226867, 1226868, 1226876, 1226878, 1226883, 1226886, 1226890, 1226891, 1226895, 1226908, 1226915, 1226928, 1226948, 1226949, 1226950, 1226953, 1226962, 1226976, 1226992, 1226994, 1226996, 1227066, 1227096, 1227101, 1227103, 1227274 CVE References: CVE-2021-4439, CVE-2021-47089, CVE-2021-47432, CVE-2021-47515, CVE-2021-47534, CVE-2021-47538, CVE-2021-47539, CVE-2021-47555, CVE-2021-47566, CVE-2021-47571, CVE-2021-47572, CVE-2021-47576, CVE-2021-47577, CVE-2021-47578, CVE-2021-47580, CVE-2021-47582, CVE-2021-47583, CVE-2021-47584, CVE-2021-47585, CVE-2021-47586, CVE-2021-47587, CVE-2021-47589, CVE-2021-47592, CVE-2021-47595, CVE-2021-47596, CVE-2021-47597, CVE-2021-47600, CVE-2021-47601, CVE-2021-47602, CVE-2021-47603, CVE-2021-47604, CVE-2021-47605, CVE-2021-47607, CVE-2021-47608, CVE-2021-47609, CVE-2021-47610, CVE-2021-47611, CVE-2021-47612, CVE-2021-47614, CVE-2021-47615, CVE-2021-47616, CVE-2021-47617, CVE-2021-47618, CVE-2021-47619, CVE-2021-47620, CVE-2022-48711, CVE-2022-48712, CVE-2022-48713, CVE-2022-48714, CVE-2022-48715, CVE-2022-48716, CVE-2022-48717, CVE-2022-48718, CVE-2022-48720, CVE-2022-48721, CVE-2022-48722, CVE-2022-48723, CVE-2022-48724, CVE-2022-48725, CVE-2022-48726, CVE-2022-48727, CVE-2022-48728, CVE-2022-48729, CVE-2022-48730, CVE-2022-48732, CVE-2022-48733, CVE-2022-48734, CVE-2022-48735, CVE-2022-48736, CVE-2022-48737, CVE-2022-48738, CVE-2022-48739, CVE-2022-48740, CVE-2022-48743, CVE-2022-48744, CVE-2022-48745, CVE-2022-48746, CVE-2022-48747, CVE-2022-48748, CVE-2022-48749, CVE-2022-48751, CVE-2022-48752, CVE-2022-48753, CVE-2022-48754, CVE-2022-48755, CVE-2022-48756, CVE-2022-48758, CVE-2022-48759, CVE-2022-48760, CVE-2022-48761, CVE-2022-48763, CVE-2022-48765, CVE-2022-48766, CVE-2022-48767, CVE-2022-48768, CVE-2022-48769, CVE-2022-48770, CVE-2022-48771, CVE-2022-48772, CVE-2023-24023, CVE-2023-52622, CVE-2023-52658, CVE-2023-52667, CVE-2023-52670, CVE-2023-52672, CVE-2023-52675, CVE-2023-52735, CVE-2023-52737, CVE-2023-52752, CVE-2023-52766, CVE-2023-52784, CVE-2023-52787, CVE-2023-52800, CVE-2023-52835, CVE-2023-52837, CVE-2023-52843, CVE-2023-52845, CVE-2023-52846, CVE-2023-52869, CVE-2023-52881, CVE-2023-52882, CVE-2023-52884, CVE-2024-26625, CVE-2024-26644, CVE-2024-26720, CVE-2024-26842, CVE-2024-26845, CVE-2024-26923, CVE-2024-26973, CVE-2024-27432, CVE-2024-33619, CVE-2024-35247, CVE-2024-35789, CVE-2024-35790, CVE-2024-35807, CVE-2024-35814, CVE-2024-35835, CVE-2024-35848, CVE-2024-35857, CVE-2024-35861, CVE-2024-35862, CVE-2024-35864, CVE-2024-35869, CVE-2024-35878, CVE-2024-35884, CVE-2024-35886, CVE-2024-35896, CVE-2024-35898, CVE-2024-35900, CVE-2024-35905, CVE-2024-35925, CVE-2024-35950, CVE-2024-35956, CVE-2024-35958, CVE-2024-35960, CVE-2024-35962, CVE-2024-35997, CVE-2024-36005, CVE-2024-36008, CVE-2024-36017, CVE-2024-36020, CVE-2024-36021, CVE-2024-36025, CVE-2024-36477, CVE-2024-36478, CVE-2024-36479, CVE-2024-36890, CVE-2024-36894, CVE-2024-36899, CVE-2024-36900, CVE-2024-36904, CVE-2024-36915, CVE-2024-36916, CVE-2024-36917, CVE-2024-36919, CVE-2024-36934, CVE-2024-36937, CVE-2024-36940, CVE-2024-36945, CVE-2024-36949, CVE-2024-36960, CVE-2024-36964, CVE-2024-36965, CVE-2024-36967, CVE-2024-36969, CVE-2024-36971, CVE-2024-36975, CVE-2024-36978, CVE-2024-37021, CVE-2024-37078, CVE-2024-37354, CVE-2024-38381, CVE-2024-38388, CVE-2024-38390, CVE-2024-38540, CVE-2024-38541, CVE-2024-38544, CVE-2024-38545, CVE-2024-38546, CVE-2024-38547, CVE-2024-38548, CVE-2024-38549, CVE-2024-38550, CVE-2024-38552, CVE-2024-38553, CVE-2024-38555, CVE-2024-38556, CVE-2024-38557, CVE-2024-38559, CVE-2024-38560, CVE-2024-38564, CVE-2024-38565, CVE-2024-38567, CVE-2024-38568, CVE-2024-38571, CVE-2024-38573, CVE-2024-38578, CVE-2024-38579, CVE-2024-38580, CVE-2024-38581, CVE-2024-38582, CVE-2024-38583, CVE-2024-38587, CVE-2024-38590, CVE-2024-38591, CVE-2024-38594, CVE-2024-38597, CVE-2024-38599, CVE-2024-38600, CVE-2024-38601, CVE-2024-38603, CVE-2024-38605, CVE-2024-38608, CVE-2024-38616, CVE-2024-38618, CVE-2024-38619, CVE-2024-38621, CVE-2024-38627, CVE-2024-38630, CVE-2024-38633, CVE-2024-38634, CVE-2024-38635, CVE-2024-38659, CVE-2024-38661, CVE-2024-38780, CVE-2024-39301, CVE-2024-39468, CVE-2024-39469, CVE-2024-39471 Jira References: PED-8491, PED-8570, PED-8690 Maintenance Incident: [SUSE:Maintenance:34676](https://smelt.suse.de/incident/34676/) Sources used: Public Cloud Module 15-SP5 (src): kernel-source-azure-5.14.21-150500.33.60.1, kernel-syms-azure-5.14.21-150500.33.60.1 openSUSE Leap 15.5 (src): kernel-source-azure-5.14.21-150500.33.60.1, kernel-syms-azure-5.14.21-150500.33.60.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
SUSE-SU-2024:2394-1: An update that solves 249 vulnerabilities, contains three features and has 44 security fixes can now be installed. Category: security (important) Bug References: 1156395, 1190336, 1191958, 1193883, 1194826, 1195065, 1195254, 1195341, 1195349, 1195775, 1196746, 1197915, 1198014, 1199295, 1202767, 1202780, 1205205, 1207361, 1217912, 1218148, 1218570, 1218820, 1219224, 1219633, 1219847, 1220368, 1220812, 1220958, 1221086, 1221282, 1221958, 1222015, 1222072, 1222080, 1222241, 1222254, 1222364, 1222893, 1223013, 1223018, 1223265, 1223384, 1223641, 1224020, 1224331, 1224488, 1224497, 1224498, 1224504, 1224520, 1224539, 1224540, 1224552, 1224583, 1224588, 1224602, 1224603, 1224605, 1224612, 1224614, 1224619, 1224661, 1224662, 1224670, 1224671, 1224674, 1224677, 1224679, 1224696, 1224703, 1224712, 1224716, 1224719, 1224735, 1224749, 1224764, 1224765, 1224766, 1224935, 1224946, 1224951, 1225050, 1225098, 1225105, 1225300, 1225389, 1225391, 1225419, 1225426, 1225448, 1225452, 1225467, 1225475, 1225484, 1225487, 1225514, 1225518, 1225535, 1225585, 1225602, 1225611, 1225681, 1225692, 1225698, 1225699, 1225704, 1225714, 1225726, 1225732, 1225737, 1225749, 1225758, 1225759, 1225760, 1225767, 1225770, 1225823, 1225834, 1225840, 1225866, 1225872, 1225894, 1226022, 1226131, 1226145, 1226149, 1226155, 1226211, 1226212, 1226226, 1226514, 1226520, 1226537, 1226538, 1226539, 1226550, 1226552, 1226553, 1226554, 1226556, 1226557, 1226558, 1226559, 1226561, 1226562, 1226563, 1226564, 1226566, 1226567, 1226569, 1226572, 1226575, 1226576, 1226577, 1226579, 1226580, 1226581, 1226582, 1226583, 1226585, 1226587, 1226588, 1226593, 1226595, 1226597, 1226601, 1226602, 1226603, 1226607, 1226610, 1226614, 1226616, 1226617, 1226618, 1226619, 1226621, 1226622, 1226624, 1226626, 1226628, 1226629, 1226632, 1226633, 1226634, 1226637, 1226643, 1226644, 1226645, 1226647, 1226650, 1226653, 1226657, 1226658, 1226669, 1226670, 1226672, 1226673, 1226674, 1226675, 1226678, 1226679, 1226683, 1226685, 1226686, 1226690, 1226691, 1226692, 1226693, 1226696, 1226697, 1226698, 1226699, 1226701, 1226702, 1226703, 1226704, 1226705, 1226706, 1226708, 1226709, 1226710, 1226711, 1226712, 1226713, 1226715, 1226716, 1226718, 1226719, 1226720, 1226721, 1226730, 1226732, 1226734, 1226735, 1226737, 1226738, 1226739, 1226740, 1226744, 1226746, 1226747, 1226749, 1226754, 1226762, 1226764, 1226767, 1226768, 1226769, 1226771, 1226774, 1226777, 1226780, 1226781, 1226785, 1226786, 1226789, 1226791, 1226839, 1226840, 1226841, 1226842, 1226848, 1226852, 1226857, 1226861, 1226863, 1226864, 1226867, 1226868, 1226876, 1226878, 1226883, 1226886, 1226890, 1226891, 1226895, 1226908, 1226915, 1226928, 1226948, 1226949, 1226950, 1226953, 1226962, 1226976, 1226992, 1226994, 1226996, 1227066, 1227096, 1227101, 1227103, 1227274 CVE References: CVE-2021-4439, CVE-2021-47089, CVE-2021-47432, CVE-2021-47515, CVE-2021-47534, CVE-2021-47538, CVE-2021-47539, CVE-2021-47555, CVE-2021-47566, CVE-2021-47571, CVE-2021-47572, CVE-2021-47576, CVE-2021-47577, CVE-2021-47578, CVE-2021-47580, CVE-2021-47582, CVE-2021-47583, CVE-2021-47584, CVE-2021-47585, CVE-2021-47586, CVE-2021-47587, CVE-2021-47589, CVE-2021-47592, CVE-2021-47595, CVE-2021-47596, CVE-2021-47597, CVE-2021-47600, CVE-2021-47601, CVE-2021-47602, CVE-2021-47603, CVE-2021-47604, CVE-2021-47605, CVE-2021-47607, CVE-2021-47608, CVE-2021-47609, CVE-2021-47610, CVE-2021-47611, CVE-2021-47612, CVE-2021-47614, CVE-2021-47615, CVE-2021-47616, CVE-2021-47617, CVE-2021-47618, CVE-2021-47619, CVE-2021-47620, CVE-2022-48711, CVE-2022-48712, CVE-2022-48713, CVE-2022-48714, CVE-2022-48715, CVE-2022-48716, CVE-2022-48717, CVE-2022-48718, CVE-2022-48720, CVE-2022-48721, CVE-2022-48722, CVE-2022-48723, CVE-2022-48724, CVE-2022-48725, CVE-2022-48726, CVE-2022-48727, CVE-2022-48728, CVE-2022-48729, CVE-2022-48730, CVE-2022-48732, CVE-2022-48733, CVE-2022-48734, CVE-2022-48735, CVE-2022-48736, CVE-2022-48737, CVE-2022-48738, CVE-2022-48739, CVE-2022-48740, CVE-2022-48743, CVE-2022-48744, CVE-2022-48745, CVE-2022-48746, CVE-2022-48747, CVE-2022-48748, CVE-2022-48749, CVE-2022-48751, CVE-2022-48752, CVE-2022-48753, CVE-2022-48754, CVE-2022-48755, CVE-2022-48756, CVE-2022-48758, CVE-2022-48759, CVE-2022-48760, CVE-2022-48761, CVE-2022-48763, CVE-2022-48765, CVE-2022-48766, CVE-2022-48767, CVE-2022-48768, CVE-2022-48769, CVE-2022-48770, CVE-2022-48771, CVE-2022-48772, CVE-2023-24023, CVE-2023-52622, CVE-2023-52658, CVE-2023-52667, CVE-2023-52670, CVE-2023-52672, CVE-2023-52675, CVE-2023-52735, CVE-2023-52737, CVE-2023-52752, CVE-2023-52766, CVE-2023-52784, CVE-2023-52787, CVE-2023-52800, CVE-2023-52835, CVE-2023-52837, CVE-2023-52843, CVE-2023-52845, CVE-2023-52846, CVE-2023-52869, CVE-2023-52881, CVE-2023-52882, CVE-2023-52884, CVE-2024-26625, CVE-2024-26644, CVE-2024-26720, CVE-2024-26842, CVE-2024-26845, CVE-2024-26923, CVE-2024-26973, CVE-2024-27432, CVE-2024-33619, CVE-2024-35247, CVE-2024-35789, CVE-2024-35790, CVE-2024-35807, CVE-2024-35814, CVE-2024-35835, CVE-2024-35848, CVE-2024-35857, CVE-2024-35861, CVE-2024-35862, CVE-2024-35864, CVE-2024-35869, CVE-2024-35878, CVE-2024-35884, CVE-2024-35886, CVE-2024-35896, CVE-2024-35898, CVE-2024-35900, CVE-2024-35905, CVE-2024-35925, CVE-2024-35950, CVE-2024-35956, CVE-2024-35958, CVE-2024-35960, CVE-2024-35962, CVE-2024-35997, CVE-2024-36005, CVE-2024-36008, CVE-2024-36017, CVE-2024-36020, CVE-2024-36021, CVE-2024-36025, CVE-2024-36477, CVE-2024-36478, CVE-2024-36479, CVE-2024-36890, CVE-2024-36894, CVE-2024-36899, CVE-2024-36900, CVE-2024-36904, CVE-2024-36915, CVE-2024-36916, CVE-2024-36917, CVE-2024-36919, CVE-2024-36934, CVE-2024-36937, CVE-2024-36940, CVE-2024-36945, CVE-2024-36949, CVE-2024-36960, CVE-2024-36964, CVE-2024-36965, CVE-2024-36967, CVE-2024-36969, CVE-2024-36971, CVE-2024-36975, CVE-2024-36978, CVE-2024-37021, CVE-2024-37078, CVE-2024-37354, CVE-2024-38381, CVE-2024-38388, CVE-2024-38390, CVE-2024-38540, CVE-2024-38541, CVE-2024-38544, CVE-2024-38545, CVE-2024-38546, CVE-2024-38547, CVE-2024-38548, CVE-2024-38549, CVE-2024-38550, CVE-2024-38552, CVE-2024-38553, CVE-2024-38555, CVE-2024-38556, CVE-2024-38557, CVE-2024-38559, CVE-2024-38560, CVE-2024-38564, CVE-2024-38565, CVE-2024-38567, CVE-2024-38568, CVE-2024-38571, CVE-2024-38573, CVE-2024-38578, CVE-2024-38579, CVE-2024-38580, CVE-2024-38581, CVE-2024-38582, CVE-2024-38583, CVE-2024-38587, CVE-2024-38590, CVE-2024-38591, CVE-2024-38594, CVE-2024-38597, CVE-2024-38599, CVE-2024-38600, CVE-2024-38601, CVE-2024-38603, CVE-2024-38605, CVE-2024-38608, CVE-2024-38616, CVE-2024-38618, CVE-2024-38619, CVE-2024-38621, CVE-2024-38627, CVE-2024-38630, CVE-2024-38633, CVE-2024-38634, CVE-2024-38635, CVE-2024-38659, CVE-2024-38661, CVE-2024-38780, CVE-2024-39301, CVE-2024-39468, CVE-2024-39469, CVE-2024-39471 Jira References: PED-8491, PED-8570, PED-8690 Maintenance Incident: [SUSE:Maintenance:34699](https://smelt.suse.de/incident/34699/) Sources used: openSUSE Leap 15.5 (src): kernel-livepatch-SLE15-SP5-RT_Update_17-1-150500.11.3.1, kernel-syms-rt-5.14.21-150500.13.61.1, kernel-source-rt-5.14.21-150500.13.61.1 SUSE Linux Enterprise Micro 5.5 (src): kernel-source-rt-5.14.21-150500.13.61.1 SUSE Linux Enterprise Live Patching 15-SP5 (src): kernel-livepatch-SLE15-SP5-RT_Update_17-1-150500.11.3.1 SUSE Real Time Module 15-SP5 (src): kernel-syms-rt-5.14.21-150500.13.61.1, kernel-source-rt-5.14.21-150500.13.61.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.